JPH11273437A - Vehicle luminaire and light guide body used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve transparency, moldability, hygroscopic deformation resistance, impact resistance and light resistance by forming a light guide body having an incidence plane receiving light and an outgoing plane sending out incident light with an alicyclic structure-containing polymer resin having a specific glass transition temperature. SOLUTION: The vehicle luminaire l is provided with a lamp 13, a light guide board (light guide body) 14, a reflecting sheet 16, a reflector 17 and prism sheets 18, 19 in a lamp chamber 15 formed with a back case 11 and a surface case 12. The light guide body 14 of the luminaire 1 is made of an alicyclic structure-containing polymer resin having the glass transition temperature of 90 deg.C or above, e.g. a norbornane polymer resin. A saturated cyclic hydrocarbon (cycloalkane) structure is preferably used for the alicyclic structure of the polymer resin. The number of carbon atoms forming the alicyclic structure is preferably set to 4-30. The ratio of the cyclic unit having the alicyclic structure in the resin is normally set to 50 wt.% or above, preferably to 70 wt.% or above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headlight, a taillight and other lamps used for four-wheeled vehicles, two-wheeled vehicles and other vehicles, and more particularly to a light guide incorporated in such a vehicle lamp.

[0002]

2. Description of the Related Art A vehicular marker light such as a tail lamp (tail light) and a stop lamp (brake light) mainly includes a lamp body formed in a container shape having an open front surface, and a light source (lamp) attached to the lamp body. And a lamp unit having a reflector, and a lamp cover (or an outer lens) attached to the front opening of the lamp body. Light from the light source is directly or reflected by the reflector to reach the lamp cover, from which the light is emitted to the outside. Is done. Such light distribution is performed by a reflector and a lamp cover.

However, in a vehicle lamp using a point light source of this type, in order to uniformly illuminate a large area, it is necessary to use a plurality of light sources as light sources or to increase the size in the thickness direction. In any case, there has been a problem that the entire lamp becomes large and the design of the vehicle is hindered.

For this reason, a vehicular lamp using a thin light guide plate having a large light emitting area has been proposed. As a conventional light guide plate, a molded article such as an acrylic (PA) resin or a polycarbonate (PC) resin has been used.

[0005]

By the way, recent tail lamps and stop lamps have been adopted as combination lamps in which these are integrated, and tend to be formed into various shapes according to needs, such as streamline shapes. The light guide plate also tends to be larger, thinner, and more complicated in shape according to the design of such a lamp. Therefore, a base material that is excellent in fluidity during molding and that can be easily formed is desired. Further, since vehicles are used under severe weather conditions, they are required to have a small hygroscopic deformation under high temperature and high humidity, and to have impact resistance and other mechanical strength.

However, although the above-mentioned acrylic resin is excellent in transparency and light resistance, it is easily deformed by absorbing moisture under high temperature and high humidity, and its impact resistance is not sufficient.

[0007] On the other hand, PC resin is excellent in impact resistance, but has large hygroscopic deformation under high temperature and high humidity, and its transparency and light resistance are not sufficient. In addition, when molding a thin-walled molded product having a fine shape, if the molding temperature is increased to enhance the fluidity, the molded product is easily hydrolyzed in a molding machine, and a molded product with good appearance is not always obtained.

The present invention has been made in view of such problems of the prior art, and is excellent in transparency, moldability and resistance to deformation due to moisture absorption, and has good and good impact resistance and light resistance. An object of the present invention is to provide a vehicle lamp and a light guide used therein.

[0009]

In order to achieve the above object, a light guide of a vehicle lamp according to the present invention is provided in a lamp room of the vehicle lamp, and has an incident surface through which light from a light source is introduced. The light guide of the vehicular lamp having an emission surface for emitting the incident light to the outside is characterized in that the light guide is made of an alicyclic structure-containing polymer resin having a glass transition temperature of 90 ° C. or more.

[0010] Further, the vehicle lamp of the present invention includes a case forming a lamp chamber, the light guide provided in the lamp chamber,
A light source provided in the lamp chamber for irradiating the light incident surface of the light guide with light.

Since the light guide according to the present invention is formed of an alicyclic structure-containing polymer resin having a glass transition temperature of 90 ° C. or higher, it has excellent transparency, small birefringence, and high temperature and humidity. It is excellent in optical characteristics such as small deformation due to moisture absorption, and is also excellent in impact resistance and light resistance. Further, the alicyclic structure-containing polymer resin having a glass transition temperature of 90 ° C. or higher according to the present invention has excellent heat resistance, can be molded without decomposition even at a high temperature, and has excellent fluidity during melting. Even with a thin, large, and complicated shape, a high-precision light guide can be easily molded without causing molding defects.

Therefore, it is excellent in transparency, moisture absorption deformation resistance, impact resistance and light resistance and is preferably applied to a light guide of a vehicular lamp for which a complicated, large, and light weight is desired.

[0013] The light guide referred to in the present invention, the term "vehicle" is, two-wheeled motor vehicles, three-wheeled motor vehicles,
This means vehicles in a broad sense, such as four-wheeled vehicles and other automobiles, railway vehicles, forklifts and other industrial vehicles. It can be used not only for vehicles but also as a light guide used in commonly used lights.

The "vehicle lamp" means a lighting or identification lamp mounted on such various vehicles.
Although not particularly limited, headlights (headlamps), taillights (rear lamps), stop lights (stop lamps), direction indicators (so-called turn signals), vehicle width lights, reverse lights, and the like are applicable.

The "light guide" according to the present invention is provided in a lamp room formed by a body of a vehicular lamp and a cover (or an outer lens), and an incident surface into which light from a light source is introduced and the incident surface. A component part of a lamp having an emission surface for emitting light to the outside, which is used for the purpose of increasing the light emitting area of the lamp or reducing the thickness of the lamp.

The shape of the "light guide" in the present invention is not particularly limited, and includes a simple shape such as a plate or a rod, as well as an appropriate shape corresponding to the shape of the lamp.

Light guides for automotive lamps are often used for tail lights and brake lights, but are not particularly limited in the present invention.
In addition, the present invention can also be applied to the above-described various lamps.

The alicyclic structure-containing polymer resin The alicyclic structure-containing polymer resin used in the present invention has an alicyclic structure in a main chain and / or a side chain, and has mechanical strength and heat resistance. From the viewpoint of properties and the like, those containing an alicyclic structure in the main chain are preferred.

Examples of the alicyclic structure of the polymer include a saturated cyclic hydrocarbon (cycloalkane) structure and an unsaturated cyclic hydrocarbon (cycloalkene) structure. From the viewpoints of mechanical strength, heat resistance and the like, A cycloalkane structure and a cycloalkene structure are preferred, and among them, those having a cycloalkane structure are most preferred.

The number of carbon atoms constituting the alicyclic structure is not particularly limited, but is usually 4 to 30, preferably 5 to 20.
When the number is in the range of 5 pieces, more preferably 5 to 15, the properties of mechanical strength, heat resistance and moldability are highly balanced and suitable.

The proportion of the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer resin used in the present invention may be appropriately selected according to the purpose of use, and is usually 50% by weight or more. Preferably at least 70% by weight, more preferably 9% by weight.
0% by weight. If the proportion of the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer resin is too small, transparency and heat resistance are inferior.

The proportion of the repeating unit having a ring structure other than the norbornane structure among the alicyclic structures in the alicyclic structure-containing polymer resin used in the present invention is appropriately selected according to the purpose of use. , But usually 10% by weight or more,
It is preferably at least 20% by weight. The larger the proportion of the repeating units having a ring structure other than the norbornane structure, the better the light resistance and the better the ability to prevent yellowing of the light guide plate.

Incidentally, the remainder other than the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer resin is not particularly limited, and is appropriately selected depending on the purpose of use.

Specific examples of the polymer resin having an alicyclic structure include (1) a norbornene-based polymer, (2) a monocyclic olefin-based polymer, and (3) a cyclic conjugated diene-based polymer. Polymers, (4) vinyl alicyclic hydrocarbon polymers, and hydrogenated products thereof.

Of these, preferred are norbornene-based polymers and hydrogenated products thereof, cyclic conjugated diene-based polymers and hydrogenated products thereof, and more preferred are norbornene-based polymers and hydrogenated products thereof.

(1) Norbornene-based polymer The norbornene-based polymer used in the present invention is not particularly limited, and is disclosed, for example, in JP-A-3-14882 and JP-A-3-122137. It is a known polymer, specifically, a ring-opened polymer of a norbornene-based monomer and a hydrogenated product thereof, an addition polymer of a norbornene-based monomer, and an addition-type polymer of a norbornene-based monomer and a vinyl compound. .

Among them, hydrogenated ring-opening polymers of norbornene-based monomers, addition-type polymers of norbornene-based monomers, and copolymers with norbornene-based monomers are used to highly balance heat resistance, transparency and light resistance. An addition type polymer of a vinyl compound which can be combined is preferable, and a hydrogenated open polymer of a norbornene-based monomer is particularly preferable.

Examples of the norbornene-based monomer include bicyclo [2.2.1] hept-2-ene (common name: norbornene) and 5-methyl-bicyclo [2.2.1] hepta-2.
-Ene, 5,5-dimethyl-bicyclo [2.2.1] hept-2-ene, 5-ethyl-bicyclo [2.2.1]
Hept-2-ene, 5-butyl-bicyclo [2.2.
1] Hept-2-ene, 5-ethylidene-bicyclo [2.2.1] -hepta-2-ene, 5-hexyl-bicyclo [2.2.1] hepta-2-ene, 5-octyl-
Bicyclo [2.2.1] hepta-2-ene, 5-octadecyl-bicyclo [2.2.1] hepta-2-ene, 5
-Ethylidene-bicyclo [2.2.1] hepta-2-ene, 5-methylidene-bicyclo [2.2.1] hepta-
2-ene, 5-vinyl-bicyclo [2.2.1] hepta-2-ene, 5-propenyl-bicyclo [2.2.1]
Hept-2-ene, 5-methoxy-carbonyl-bicyclo [2.2.1] hept-2-ene, 5-cyano-bicyclo [2.2.1] hept-2-ene, 5-methyl-5
-Methoxycarbonyl-bicyclo [2.2.1] hept-2-ene; 5-methoxycarbonylbicyclo [2.
2.1] Hept-2-ene, 5-ethoxycarbonylbicyclo [2.2.1] hept-2-ene, 5-methyl-
5-methoxycarbonylbicyclo [2.2.1] hept-2-ene, 5-methyl-5-ethoxycarbonylbicyclo [2.2.1] hept-2-ene, bicyclo [2.
2.1] Hept-5-enyl-2-methylpropionate, bicyclo [2.2.1] hept-5-enyl-2-
Methyl octanate, bicyclo [2.2.1] hept-
2-ene-5,6-dicarboxylic anhydride, 5-hydroxymethylbicyclo [2.2.1] hept-2-ene,
5,6-di (hydroxymethyl) bicyclo [2.2.
1] Hept-2-ene, 5-hydroxy-i-propylbicyclo [2.2.1] hept-2-ene, 5,6-dicarboxybicyclo [2.2.1] hept-2-ene;
5-Cyanobicyclo [2.2.1] hept-2-ene, bicyclo [2.2.1] hept-2-ene-5,6
-Dicarboxylic acid imide; tricyclo [4.3.1 ^2,5 .
0 ^1,6 ] deca-3,7-diene (common name: dicyclopentadiene), tricyclo [4.3.1 ^2,5 . 0 ^1,6 ] dec-3-ene; tricyclo [4.4.1 ^2,5 . 0 ^1,6 ]
Undeca-3,7-diene or tricyclo [4.
4.1 ^2,5 . [ ^1,6 ] undeca-3,8-diene or a partially hydrogenated product thereof (or an adduct of cyclopentadiene and cyclohexene), ie, tricyclo [4.4.
^12.5 . 0 ^1,6 ] undec-3-ene; 5-cyclopentyl-bicyclo [2.2.1] hept-2-ene, 5
-Cyclohexyl-bicyclo [2.2.1] hept-2
-Ene, 5-cyclohexenylbicyclo [2.2.1]
Hept-2-ene, 5-phenyl-bicyclo [2.2.
1] hept-2-ene; tetracyclo [4.4.1
^2,5 . ^17,10 . 0] - dodeca-3-ene (also simply referred to as tetracyclododecene), 8-methyl tetracyclo [4.4.1 ^{2,5. 17,10} . 0] -dodec-3-ene,
8-ethyltetracyclo [4.4.1 ^2,5 . ^17,10 .
0] -dodec-3-ene, 8-methylidenetetracyclo [4.4.1 ^2,5 . ^17,10 . 0] -dodec-3-ene,
8-ethylidenetetracyclo [4.4.1 ^2,5 .
1 ^{7, 10.} 0] -dodec-3-ene, 8-vinyltetracyclo [[4.4.1 ^2,5 . ^17,10 . 0] -dodeca-3-
Ene, 8-propenyl-tetracyclo [4.4.
1 ^{2, 5. 17,10} . 0] -dodec-3-ene, 8-methoxycarbonyltetracyclo [4.4.1 ^2,5 . ^17,10 .
0] -dodec-3-ene, 8-methyl-8-methoxycarbonyltetracyclo [4.4.1 ^2,5 . ^17,10 . 0]
-Dodeca-3-ene, 8-hydroxymethyltetracyclo [4.4.1 ^2,5 . ^17,10 . 0] -dodec-3-ene, 8-carboxytetracyclo [4.4.1 ^2,5 . 1
^7,10 . 0] -dodec-3-ene; 8-cyclopentyl-tetracyclo [4.4.1 ^2,5 . ^17,10 . 0] -dodec-3-ene, 8-cyclohexyl-tetracyclo [4.4.1 ^2,5 . ^17,10 . 0] -dodec-3-ene,
8-cyclohexenyl-tetracyclo [4.4.
^12.5 . ^17,10 . 0] -dodec-3-ene, 8-phenyl-cyclopentyl-tetracyclo [4.4.1 ^2,5 .
^17,10 . 0] -dodec-3-ene; tetracyclo [7.4.1 ^10,13 . 0 ^1,9 . 0 ^2,7 ] trideca-2,
4,6,11-tetraene (1,4-methano-1,4,4)
4a, 9a-tetrahydrofluorene), tetracyclo [8.4.1 ^11,14 . 0 ^1,10 . 0 ^3,8] tetradec -3,5,7,12- tetraene (1,4-methano -1,4,4a, also referred to as a 5,10,10a- hexahydrophthalic anthracene), pentacyclo [6.5.1 ^{1 , 8} .
1 ^{3, 6.} 0 ^2,7 . 0 ^9,13] pentadeca-3,10-diene, pentacyclo [7.4.1 ^3,6. 1 ^10,13 .
0 ^1,9 . 0 ^2,7 ] pentadeca-4,11-diene; cyclopentadiene tetramer; and the like. These norbornene monomers may be used alone or in combination of two or more.

Examples of the copolymerizable vinyl compound include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl-1-pentene and 3-ethyl- 1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,
4-dimethyl-1-hexene, 4,4-dimethyl-1-
Pentene, 4-ethyl-1-hexene, 3-ethyl-1
-Hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene and the like, ethylene or α-olefin having 2 to 20 carbon atoms; cyclobutene, cyclopentene, cyclohexene, 3,4-dimethylcyclopentene, 3-methylcyclohexene, 2- (2-methylbutyl) -1-cyclohexene, cyclooctene, 3a,
5,6,7a-tetrahydro-4,7-methano-1H-
Cycloolefins such as indene; 1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-
Non-conjugated dienes such as 1,4-hexadiene and 1,7-octadiene; These vinyl compounds can be used alone or in combination of two or more.

The polymerization method and hydrogenation method of the norbornene monomer or the vinyl compound which can be copolymerized with the norbornene monomer are not particularly limited, and can be carried out according to known methods.

The ring-opening (co) polymer of a norbornene-based monomer is prepared by converting a norbornene-based monomer into a ruthenium, rhodium, palladium, osmium,
Iridium, a metal halide such as platinum, a nitrate or acetylacetone compound and a catalyst system comprising a reducing agent, or titanium, vanadium, zirconium, tungsten, a metal halide such as molybdenum or an acetylacetone compound, and an organic aluminum compound Using a catalyst system consisting of: in a solvent or without solvent, usually at a polymerization temperature of -50 ° C to 100 ° C, 0 to 50 kg / c
It can be obtained by ring-opening (co) polymerization at a polymerization pressure of m ² .

In the catalyst system, molecular oxygen, alcohol, ether, peroxide, carboxylic acid, acid anhydride, acid chloride,
By adding a third component such as an ester, ketone, nitrogen-containing compound, sulfur-containing compound, halogen-containing compound, molecular iodine, or other Lewis acid, the polymerization activity and the selectivity of ring-opening polymerization can be increased.

The hydrogenated norbornene polymer can be obtained by a conventional method in which a ring-opened (co) polymer is hydrogenated with hydrogen in the presence of a hydrogenation catalyst.

The addition copolymer of a norbornene-based monomer and a vinyl-based compound can be prepared, for example, by adding a monomer component in a solvent or without a solvent in the presence of a catalyst system comprising a titanium, zirconium, or vanadium compound and an organoaluminum compound. In general, a polymerization temperature of -50 ° C to 100 ° C,
It can be obtained by a method of copolymerizing at a polymerization pressure of 50 kg / cm ² .

(2) Monocyclic Cyclic Olefin Polymer Examples of the monocyclic cycloolefin polymer include, for example, cyclolohexene, cycloheptene, cyclooctene and the like disclosed in JP-A-64-66216. An addition polymer of a monocyclic cyclic olefin monomer can be used.

(3) Cyclic conjugated diene polymer As the cyclic conjugated diene polymer, for example, Japanese Patent Application Laid-Open No.
The cyclic conjugated diene-based monomers such as cyclopentadiene and cyclohexadiene disclosed in JP-A-136057 and JP-A-7-258318 are used as 1,2- or 1,2-
4-Polymerized polymers and hydrogenated products thereof can be used.

(4) Vinyl alicyclic hydrocarbon-based polymer Examples of the vinyl alicyclic hydrocarbon-based polymer include vinyl cyclohexene and vinyl cyclohexane disclosed in JP-A-51-59989. Polymers of alicyclic hydrocarbon-based monomers and hydrogenated products thereof, vinyls such as styrene and α-methylstyrene disclosed in JP-A-63-43910 and JP-A-64-1706. A hydrogenated product of the aromatic ring portion of the polymer of the aromatic monomer can be used.

The molecular weight of the alicyclic structure-containing polymer resin used in the present invention is appropriately selected according to the purpose of use.
Weight average molecular weight in terms of polystyrene measured by gel permeation chromatography of cyclohexane solution (toluene solution if polymer resin does not dissolve)
5,000 or more, preferably 5,000 to 500,00
When it is in the range of 0, more preferably in the range of 8,000 to 200,000, particularly preferably in the range of 10,000 to 100,000, the mechanical strength and the formability are highly balanced and suitable.

The glass transition temperature (Tg) of the alicyclic structure-containing polymer resin used in the present invention may be appropriately selected according to the purpose of use. Preferably, when the temperature is usually 90 ° C. or higher, preferably 120 ° C. or higher, more preferably 140 ° C. or higher, heat resistance and molding processability are highly balanced and suitable.

JIS of the alicyclic structure-containing polymer resin used in the present invention at 280 ° C. under a load of 2.16 kgf
The melt flow rate measured by K6719 may be appropriately selected depending on the purpose of use.
g / 10 min. , Preferably 10 to 50 g / 10 mi
n. Is suitable. If the melt flow rate is too low, the temperature at which the molding material is heated at the time of molding becomes higher, so that processing may be difficult. If it is too high, molding defects such as burrs may occur at the time of molding.

Incidentally, these alicyclic structure-containing polymer resins can be used alone or in combination of two or more.

Other Components In the light guide of the present invention, other polymers, various compounding agents and fillers may be used alone or in combination with the alicyclic structure-containing polymer resin, if necessary. They can be used in combination.

(1) Other Polymers The light guide of the present invention may further comprise, if necessary, polybutadiene, polyisoprene,
Rubber such as SBS, SIS, SEBS; polystyrene,
Other polymers such as resins such as poly (meth) acrylate, polycarbonate, polyester, polyether, polyamide, polyimide, and polysulfone can be blended. These other polymers can be used alone or in combination of two or more. In addition, the ratio is appropriately selected within a range that does not impair the object of the present invention.

(2) Compounding Agent In the light guide of the present invention, a compounding agent can be added to the alicyclic structure-containing polymer resin as required. There is no particular limitation on the compounding agent as long as it is generally used in thermoplastic resin materials.For example, coloring such as antioxidants, ultraviolet absorbers, light stabilizers, near infrared absorbers, dyes and pigments, etc. Agents, lubricants, plasticizers, antistatic agents, optical brighteners and the like.

Examples of the antioxidant include a phenolic antioxidant, a phosphorus-based antioxidant, and a sulfur-based antioxidant. Of these, a phenol-based antioxidant is preferable, and an alkyl-substituted phenol-based antioxidant is preferable. Agents are particularly preferred.

As the phenolic antioxidant, conventionally known phenolic antioxidants, for example, 2-t-butyl-6-
(3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate, 2,4-di-
t-Amyl-6- (1- (3,5-di-t-amyl-2)
-Hydroxyphenyl) ethyl) phenyl acrylate and the like.
Acrylate compounds described in 68643;
Octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,2′-methylene-bis (4-methyl-6-t-butylphenol),
1,1,3-tris (2-methyl-4-hydroxy-5
-Tert-butylphenyl) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4)
-Hydroxybenzyl) benzene, tetrakis (methylene-3- (3 ', 5'-di-tert-butyl-4'-hydroxyphenylpropionate) methane [namely, pentaerythrimethyl-tetrakis (3- (3,5 -Di-t
-Butyl-4-hydroxyphenylpropionate)], triethylene glycol bis (3- (3-t
Alkyl-substituted phenolic compounds such as -butyl-4-hydroxy-5-methylphenyl) propionate);
6- (4-hydroxy-3,5-di-t-butylanilino) -2,4-bisoctylthio-1,3,5-triazine, 4-bisoctylthio-1,3,5-triazine, 2- Octylthio-4,6-bis- (3,5-di-
triazine group-containing phenolic compounds such as t-butyl-4-oxyanilino) -1,3,5-triazine;

The phosphorus-based antioxidant is not particularly limited as long as it is generally used in the general resin industry. For example, triphenyl phosphite, diphenyl isodecyl phosphite, phenyl diisodecyl phosphite, tris ( Nonylphenyl) phosphite, tris (dinonylphenyl) phosphite, tris (2,4-di-t-
Butylphenyl) phosphite, 10- (3,5-di-
t-butyl-4-hydroxybenzyl) -9,10-dihydro-9-oxa-10-phosphaphenanthrene-
Monophosphite compounds such as 10-oxide;
4,4'-butylidene-bis (3-methyl-6-t-butylphenyl-di-tridecyl phosphite), 4,
Diphosphite compounds such as 4 ′ isopropylidene-bis (phenyl-di-alkyl (C12-C15) phosphite); Among these, monophosphite compounds are preferred, and tris (nonylphenyl) phosphite, tris (dinonylphenyl) phosphite, tris (2,4-di-t-butylphenyl) phosphite and the like are particularly preferred.

Examples of the sulfur-based antioxidants include dilauryl 3,3-thiodipropionate, dimyristyl 3,3'-thiodipropionate, and distearyl.
3,3-thiodipropionate, laurylstearyl 3,3-thiodipropionate, pentaerythritol-tetrakis- (β-lauryl-thio-propionate, 3,9-bis (2-dodecylthioethyl) -2,2
4,8,10-tetraoxaspiro [5,5] undecane and the like.

Each of these antioxidants is used alone.
Alternatively, two or more kinds can be used in combination.
The compounding amount of the antioxidant is appropriately selected within a range not to impair the purpose of the present invention, and is usually 0.001 to 5 parts by weight, preferably 0.01 to 5 parts by weight, based on 100 parts by weight of the polymer component.
The range is 1 part by weight.

As the ultraviolet absorber, for example, 2- (2
-Hydroxy-5-methylphenyl) 2H-benzotriazole, 2- (3-t-butyl-2-hydroxy-5)
-Methylphenyl) -5-chloro-2H-benzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) -5-chloro-2H-benzotriazole, 2- (3,5-di -T-butyl-2-hydroxyphenyl) -2H-benzotriazole, 5-chloro-2
-(3,5-di-t-butyl-2-hydroxyphenyl) -2H-benzotriazole, 2- (3,5-di-
benzotriazole ultraviolet absorbers such as t-amyl-2-hydroxyphenyl) -2H-benzotriazole; 4-t-butylphenyl-2-hydroxybenzoate, phenyl-2-hydroxybenzoate, 2,4
-Di-t-butylphenyl-3,5-di-t-butyl-
4-hydroxybenzoate, hexadecyl-3,5-
Di-tert-butyl-4-hydroxybenzoate, 2-
(2H-benzotriazol-2-yl) -4-methyl-6- (3,4,5,6-tetrahydrophthalimidylmethyl) phenol, 2- (2-hydroxy-5-t-octylphenyl) -2H -Benzotriazole, 2-
Bezoate UV absorbers such as (2-hydroxy-4-octylphenyl) -2H-benzotriazole;
2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-
Methoxybenzophenone-5-sulfonic acid trihydrate, 2
-Hydroxy-4-octyloxybenzophenone, 4-
Dodecaloxy-2-fodroxybenzophenone, 4-benzyloxy-2-hydroxybenzophenone, 2,
2 ′, 4,4′-tetrahydroxybenzophenone,
Benzophenone ultraviolet absorbers such as 2,2'-dihydroxy-4,4'-dimethoxybenzophenone; ethyl-2-cyano-3,3-diphenylacrylate, 2 '
Acrylate UV absorbers such as -ethylhexyl-2-cyano-3,3-diphenylacrylate; [2,
2'-thiobis (4-t-octylphenolate)]-
Metal complex UV absorbers such as 2-ethylhexylamine nickel are exemplified.

As the light stabilizer, for example, 2, 2, 6,
6-tetramethyl-4-piperidyl benzoate, bis (2,2,6,6-tetramethyl-4-piperidyl)
Sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) -2- (3,5-di-t-butyl-
4-hydroxybenzyl) -2-n-butylmalonate, 4- (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy) -1- (2- (3
-(3,5-di-t-butyl-4-hydroxyphenyl) propionyloxy) ethyl) -2,2,6,6-
Hindered amine light stabilizers such as tetramethylpiperidine can be mentioned.

The near-infrared absorber includes, for example, a cyanine-based near-infrared absorber; a pyrylium-based infrared absorber; a squarylium-based near-infrared absorber; a croconium-based infrared absorber;
Azurenium-based near-infrared absorber; phthalocyanine-based near-infrared absorber; dithiol metal complex-based near-infrared absorber;
Naphthoquinone-based near-infrared absorber; anthraquinone-based near-infrared absorber; indophenol-based near-infrared absorber; azimuth-based near-infrared absorber; In addition, commercially available near-infrared absorbers SIR-103, SIR-114, SIR
-128, SIR-130, SIR-132, SIR-
152, SIR-159, SIR-162 (manufactured by Mitsui Toatsu Dye), Kayasorb IR-750, Ka
yasorb IRG-002, Kayasorb I
RG-003, IR-820B, Kayasorb I
RG-022, Kayasorb IRG-023, Ka
yasorb CY-2, Kayasorb CY-
4, Kayasorb CY-9 (Nippon Kayaku)
And the like.

The dye is not particularly limited as long as it can be uniformly dispersed and dissolved in the alicyclic structure-containing polymer according to the present invention, but is compatible with the alicyclic structure-containing polymer used in the present invention. Therefore, oil-soluble dyes (various CI solvent dyes) are widely used. Specific examples of oil-soluble dyes include The Society of Diyesan
d Colorists, Color Index
vol. Various C.3 described in C.3. I. Solvent dyes.

As the pigment, for example, diarylide pigments such as Pigment Red 38; Pigment Red 48:
2, Pigment Red 53, Pigment Red 57: 1
Pigment Red 144, Pigment Red 166, Pigment Red 220, Pigment Red 221, Pigment Red 248, etc .; Condensed Azo Lake Pigments; Pigment Red 171, Pigment Red 175, Pigment Red 176, Pigment Red 1
85, penzimidazolone pigments such as Pigment Red 208; quinacridone pigments such as Pigment Red 122; Pigment Red 149, Pigment Red 17
8, perylene pigments such as Pigment Red 179; and anthraquinone pigments such as Pigment Red 177.

When the light guide of the present invention needs to be colored, any of dyes and pigments can be used within the scope of the purpose of the present invention. In the case of such a light guide, coloring with a dye is preferred. Also, the ultraviolet absorber may show a yellow to red color visually, and the near-infrared absorber may show a black color visually, so there is no need to strictly use these and dyes, Further, they may be used in combination.

As the lubricant, an organic compound such as an ester of an aliphatic alcohol, an ester of a polyhydric alcohol or a partial ester thereof, and inorganic fine particles can be used. Examples of the organic compound include glycerin monostearate, glycerin monolaurate, glycerin distearate, pentaerythritol monostearate, pentaerythritol distearate, and pentaerythritol tristearate.

In general, inorganic particles can be used as the other lubricant. Here, the inorganic fine particles include oxides, sulfides, hydroxides, nitrides, halides, carbonates, sulfates, and acetates of elements belonging to Groups 1, 2, 4, and 6 to 14 of the periodic table. And particles of phosphate, phosphite, organic carboxylate, silicate, titanate, borate and hydrates thereof, composite compounds mainly containing them, and natural compounds.

As the plasticizer, for example, tricresyl phosphate, trixylyl phosphate, triphenyl phosphate, triethylphenyl phosphate, diphenylcresyl phosphate, monophenyldicresyl phosphate, diphenylmonoxylenyl phosphate Phosphate triester plasticizers such as phosphate, monophenyldixylenyl phosphate, tributyl phosphate and triethyl phosphate; dimethyl phthalate, dibutyl phthalate, diheptyl phthalate, di-n-octyl phthalate, di-phthalate 2-ethylhexyl, diisononyl phthalate, octyldecyl phthalate,
Phthalate ester plasticizers such as butyl benzyl phthalate; fatty acid monobasic ester plasticizers such as butyl oleate and glycerin monooleate; dihydric alcohol ester plasticizers; oxy acid ester plasticizers
Among them, a phosphoric acid triester plasticizer is preferable, and tricresyl phosphate and tricillyl phosphate are particularly preferable.

Further, as the softening agent or plasticizer, a hydrocarbon polymer which is liquid at room temperature and whose main skeleton is mainly a CC or C ＝ C structure is preferably used. Among the liquid hydrocarbon polymers, a linear or branched liquid hydrocarbon polymer having no hydrocarbon ring in the main chain is preferable. Also, since the obtained light guide has excellent weather resistance,
Those having substantially no C ＝ C structure are preferred. The weight average molecular weight of the liquid hydrocarbon polymer is preferably 1
000 or less, more preferably 200 to 8,000,
Particularly preferably, it is in the range of 300 to 4,000. Specific examples of the liquid hydrocarbon polymer include squalane (C3
0H62, Mw = 422.8), liquid paraffin (white oil, ISO specified in JIS K2231)
VG10, ISO VG15, ISO VG32, IS
O VG68, ISO VG100, VG8 and VG
21), polyisobutene, hydrogenated polybutadiene, hydrogenated polyisoprene, and the like. Among them, squalane, liquid paraffin and polyisobutene are preferred.

Examples of the antistatic agent include long-chain alkyl alcohols such as stearyl alcohol and behenyl alcohol, and fatty acid esters of polyhydric alcohols such as glycerin monostearate and pentaerythritol monostearate. Stearyl alcohol and behenyl alcohol are particularly preferable. preferable.

These compounding agents can be used alone or in admixture of two or more, and the ratio is appropriately selected within a range not to impair the object of the present invention. The amount is appropriately selected within a range that does not impair the object of the present invention, and is usually 0.001 to 5 parts by weight, preferably 0.01 to 1 part by weight, based on 100 parts by weight of the polymer component. .

Molding Material and Molding Method In the present invention, the alicyclic structure-containing polymer is used by mixing the above components as necessary. The mixing method is not particularly limited as long as these compounding agents are sufficiently dispersed in the alicyclic structure-containing polymer. For example, a method of kneading a resin in a molten state with a mixer, a twin-screw kneader, a roll, a Brabender, an extruder, or the like, dissolving and dispersing in a suitable solvent, coagulating, casting, or directly drying a solvent. There is a method of removing.

In the case of using a twin-screw kneader, after kneading, the mixture is usually extruded into a rod shape in a molten state, cut into a suitable length by a strand cutter, and pelletized.

The light guide of the vehicle lamp of the present invention is obtained by molding the above molding material. The molding method may be in accordance with a conventionally known molding method. Injection molding, press molding, extrusion blow molding, injection blow molding, multilayer blow molding, connection blow molding, double wall blow molding, stretch blow molding, vacuum molding, rotation Molding and the like. Injection molding and press molding are preferred from the molding accuracy. The melting temperature of the resin during molding varies depending on the type of the alicyclic structure-containing polymer, but is usually 100 to 400 ° C, preferably 2 to 400 ° C.
00-350 ° C.

[0065]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a front view showing a first embodiment of a vehicular lamp according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. FIG.

The vehicular lamp 1 of the present embodiment is a tail lamp for a passenger car, and is a lamp that also serves as a tail lamp and a brake lamp. The lamp 1 includes a lamp 13, a light guide plate (a light guide according to the present invention) 14, a reflection sheet 16, and a reflector 1 in a lamp chamber 15 formed by a back case 11 and a front case 12.
7 and prism sheets 18 and 19 are provided.

The lamp 13 is a straight tube type neon lamp having a diameter of about 10 mm, and extends along an upper end surface 141 and a lower end surface 142 of the light guide plate 14 described later (both correspond to the incident surface of the present invention). The light from the neon lamp 13 is efficiently incident on the incident surfaces 141 and 142 of the light guide plate 14 by the tunnel-shaped reflector 17 provided so as to cover the neon lamp 13. As the reflector 17, one having an increased reflectance, such as one obtained by laminating an Ag film on an aluminum plate or one obtained by mirror-finishing the surface of an aluminum plate is used. Further, a neon lamp 1 is provided by a dimming circuit (not shown).
The brightness is adjusted to a maximum power when the brake is depressed, and when the small lamp is turned on at night, for example, several tens% of dimming lighting is performed.

On the back surface of the light guide plate 14 (the back case 11 side), dot printing for uniformly guiding the light incident from the incident surfaces 141 and 142 to the front surface (the front case 12 side) is performed. FIG. 3 shows the light guide plate 1 from the dot printed back surface.
FIG. 4 is a view of the neon lamp 4 and the neon lamp 13 and shows an example of dot printing. In this example, the closer to the neon lamp 13 which is a linear light source, the smaller the area ratio of the printed portion is.
The area ratio is considered to be “dense” as the distance increases. That is, the density is highest at the center, and gradually becomes sparser as the distance from the center increases. As a printing ink for such dot printing, for example, a matt medium ink containing Si or the like in a white or transparent resin is used, but in the case of a tail lamp or a stop lamp as in the present embodiment, a red pigment may be used. . The dot printing method is generally a silk printing method, but may be a hot stamping method or another method.

Between the back surface of the light guide plate 14 on which the dot printing is performed and the back case 11, of the light incident from the incident surfaces 141 and 142, the light passing through the above-described dot printing portion is reflected. A reflection sheet 16 for guiding the light 1 toward the front surface side (front case 12 side) is provided, is formed of a material exhibiting high reflectance, and is provided over the entire back surface of the light guide plate 14.

On the other hand, two prism sheets are provided on the front side of the light guide plate 14 in order to direct light emitted from the surface of the light guide plate 14 (the emission surface in the present invention) perpendicular to the light emission surface. 18 and 19 are provided. The prism sheets 18 and 19 are formed by forming 90 ° prisms linearly at a pitch of, for example, 1 mm or less on a polycarbonate sheet or an acrylic sheet. For example, one of the prism sheets 19 has a vertical linear prism. The other prism sheet 18 is formed with a horizontal linear prism.

In particular, the light guide plate 14 according to this embodiment includes a norbornene-based polymer, a monocyclic cyclic olefin-based polymer,
It is molded with an alicyclic structure-containing polymer resin such as a cyclic conjugated diene polymer, a vinyl alicyclic hydrocarbon polymer, and a hydrogenated product thereof. Such an alicyclic structure-containing polymer resin has an alicyclic structure in the main chain and / or the side chain, and contains an alicyclic structure in the main chain from the viewpoint of mechanical strength, heat resistance and the like. Are preferred.

Examples of the alicyclic structure of the polymer include a saturated cyclic hydrocarbon (cycloalkane) structure and an unsaturated cyclic hydrocarbon (cycloalkene) structure. From the viewpoints of mechanical strength and heat resistance, A cycloalkane structure and a cycloalkene structure are preferred, and among them, those having a cycloalkane structure are most preferred.

In such a vehicle lamp 1, the light from the neon lamp 13 is directly or after being reflected by the reflector 17, and then from the entrance surfaces of the upper end surface 141 and the lower end surface 142 of the light guide plate 14 into the light guide plate 14. And a part of the light is reflected by the reflection sheet 16 through the dot printing unit.
The light as a whole is emitted from the front surface of the light guide plate 14 as uniform light. This light is directed by the prism sheets 18 and 19 in a direction perpendicular to the light emitting surface of the light guide plate 14,
The light exits through the front case 12 on which the light distribution lens 121 is formed. As a result, the following vehicle can check the lighting of the marker light of the vehicle.

At this time, since the light guide plate 14 of the present embodiment is formed of an alicyclic structure-containing polymer resin, it has excellent transparency, small birefringence, and also has low moisture absorption deformation under a high temperature and high humidity environment. It has excellent optical properties such as small size, and also has excellent impact resistance and light resistance. In addition, this alicyclic structure-containing polymer resin has excellent heat resistance, can be molded without decomposition even at high temperatures, and has excellent fluidity when melted. Even with a light plate, a high-precision light guide can be easily formed without causing molding defects.

Second Embodiment FIG. 4 is a cross-sectional view showing a second embodiment of a vehicular lamp according to the present invention, and FIG. 5 is a cross-sectional view showing a modification thereof. The vehicle lamp 1 of the present embodiment is a combination tail lamp for a passenger car, and is a lamp that also serves as a tail lamp, a brake lamp, and a direction indicator lamp. In particular, since the lamp 1 of the present embodiment is a combination lamp that also serves as a direction indicator lamp,
The shape is such that it goes around the side surface of the body greatly.

The lamp 1 has a back case 11 and a front case 1
2 and a lamp 1 as a point light source.
3. A light guide plate (light guide according to the present invention) 14 and an inner lens 20 are provided. 4 and 5
Indicates a tail lamp on the left side of the vehicle, and a right side lamp on the right side of the vehicle has a symmetrical shape with respect to a center line in the front-rear direction of the vehicle. Also, the direction indicator lamp is not shown in FIG.

Light from the lamp 13 composed of a point light source is guided to the front case 12 by a reflector (not shown), and the inner lens 20 formed by a Fresnel lens or the like.
Out to the outside via

The lamp 1 of the present embodiment has its entrance surface 141 located at a position where it does not interfere with the inner lens 20 described above.
And a light guide plate 14 whose one end is shaped so as to be largely wrapped around the body side along the shape of the lamp 1. The light guide plate 14 extends from the incident surface 141 to the light guide plate 14.
An emission surface 143 for guiding light incident into the body toward the body side, and the light guide plate 1
A prism cut 144 is provided for uniformly emitting the light passing through the inside 4 from the emission surface 143.

The vehicle lamp 1 shown in FIG. 5 is obtained by integrally molding the inner lens 20 and the light guide plate 14 shown in FIG.
Even in this lamp 1, the light that has entered the incident surface 141 of the light guide plate 14 from the lamp 13 is guided in the light guide plate 14, reaches the emission surface 143, and is emitted from here toward the body side.

In such a vehicular lamp 1, by appropriately adjusting the position of the incident surface 141 of the light guide plate 14, etc.
The amount of light emitted from the emission surface 143 of the light guide plate 14 can be controlled, so that the brightness of the rear portion of the body and the brightness of the body side portion when observed from the front case 12 are adjusted to be equal, for example. Can be.

The light guide plate 14 according to the present embodiment also includes a norbornene-based polymer, a monocyclic olefin-based polymer, a cyclic conjugated diene-based polymer, a vinyl alicyclic hydrocarbon polymer, and a hydrogenated product thereof. It is molded with an alicyclic structure-containing polymer resin. In particular, in the embodiment shown in FIG. 5, the inner lens 20 is also formed of an alicyclic structure-containing polymer resin. Such an alicyclic structure-containing polymer resin has an alicyclic structure in the main chain and / or the side chain, and contains an alicyclic structure in the main chain from the viewpoint of mechanical strength, heat resistance and the like. Are preferred.

Examples of the alicyclic structure of the polymer include a saturated cyclic hydrocarbon (cycloalkane) structure and an unsaturated cyclic hydrocarbon (cycloalkene) structure. From the viewpoints of mechanical strength, heat resistance and the like, A cycloalkane structure and a cycloalkene structure are preferred, and among them, those having a cycloalkane structure are most preferred.

Since the light guide plate 14 of this embodiment is formed of an alicyclic structure-containing polymer resin, it has excellent transparency, small birefringence, and small deformation due to moisture absorption under a high temperature and high humidity environment. It has excellent characteristics and also excellent impact resistance and light resistance. In addition, this alicyclic structure-containing polymer resin has excellent heat resistance and can be molded without decomposition even at high temperatures,
Since it is also excellent in fluidity at the time of melting, it is possible to easily form a high-precision light guide without causing molding defects even if the light guide plate is thin and has a large and complicated shape.

Further, in the vehicle lamp 1 shown in FIG. 5, since the light guide plate 14 and the inner lens 20 are integrally formed, a step of assembling the inner lens 20 as a separate component is not required. In addition to this, the inner lens 20
Molded with the alicyclic structure-containing polymer resin described above, the birefringence is small, the optical properties such as small deformation due to environmental changes are excellent, and the moldability is good and the surface accuracy is excellent. .

Third Embodiment FIG. 6 is an exploded perspective view showing a vehicle lamp according to a third embodiment of the present invention, FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6, and FIG. FIG. 9 is a perspective view showing a light guide rod, and FIG.
FIG. 10 is a cross-sectional view taken along the X-ray, and FIG. 10 is a view showing the light distribution action of the light guide bar according to the embodiment.

The vehicular lamp 1 of the present embodiment is a high-mount stop lamp for a passenger vehicle, and is a lamp that is arranged in a rear parcel, a back door, a trunk lid, a rear spoiler, and the like in a room. In this lamp 1, a light guide rod (light guide according to the present invention) 14 is provided in a lamp chamber 15 formed by a back case 11 and a front case 12, and a light source section is provided on one side outside the lamp chamber 15. 13 are provided.

As shown in FIG. 7, the rear case 11 has a parabolic cross-sectional shape, the inner surface of which is configured as a reflective surface, and the light guide bar 14 is disposed at the focal position of the reflective surface. The front case 12 attached to the opening of the back case 11 is made of a transparent resin colored in a required color (for example, red), and slightly diffuses light from the light guide rod 14 in the vertical and horizontal directions. A diffusion step is provided on its inner surface for diffusion.

The light guide rod 14 according to the present embodiment is formed in a round bar shape as shown in FIGS. 8 and 10 and is housed in a lamp chamber 15. On the front side facing the front case 12,
Total reflection steps 145 are formed at a plurality of locations in the longitudinal direction. The total reflection step 145 is constituted by a concave portion having a sawtooth cross section, and totally reflects the light transmitted through the light guide rod 14 in a right angle direction as shown in FIG.
Is configured to be emitted to the back side of the. In the total reflection step 145 of this example, the step size is gradually increased from the light source unit 13 side of the light guide rod 14 toward the tip end,
A uniform light emitting surface as a whole of the lamp 1 appears on the front case 12.

On the other hand, the light source unit 13 connected to the base end of the light guide rod 14 has a light bulb 132, a reflecting mirror 133 and a lens 134 in a casing 131 having substantially the same cross section as the lamp chamber 15, as shown in FIG. Are integrally provided, and the incident surface 141 of the light guide rod 14 is inserted into one side surface thereof.
As a result, the light from the bulb 132 is reflected and collected by the reflecting mirror 133 and the lens 134, and the incident surface 1 of the light guide rod 14 is
From 41, the light is transmitted into the light guide rod 14.

In particular, the light guide rod 14 according to the present embodiment includes a norbornene-based polymer, a monocyclic cyclic olefin-based polymer,
It is molded with an alicyclic structure-containing polymer resin such as a cyclic conjugated diene polymer, a vinyl alicyclic hydrocarbon polymer, and a hydrogenated product thereof. Such an alicyclic structure-containing polymer resin has an alicyclic structure in the main chain and / or the side chain, and contains an alicyclic structure in the main chain from the viewpoint of mechanical strength, heat resistance and the like. Are preferred.

Examples of the alicyclic structure of the polymer include a saturated cyclic hydrocarbon (cycloalkane) structure and an unsaturated cyclic hydrocarbon (cycloalkene) structure. From the viewpoints of mechanical strength, heat resistance and the like, A cycloalkane structure and a cycloalkene structure are preferred, and among them, those having a cycloalkane structure are most preferred.

In such a vehicle lamp 1, the light from the light source 13 enters the light guide plate 14 from the incident surface 141 of the light guide rod 14, and is directed to the back case 11 by a plurality of total reflection steps 145. reflect. Then, the light is reflected by the parabolic reflection surface of the back case 11 so as to travel toward the front case 12, and is emitted as uniform light from the front case 12 as a whole. As a result, the following vehicle can confirm the lighting of the brake sign light of the vehicle.

At this time, since the light guide rod 14 of this embodiment is formed of an alicyclic structure-containing polymer resin, it has excellent transparency, small birefringence, and has a hygroscopic deformation under a high temperature and high humidity environment. Also, it has excellent optical characteristics such as small size, and also has excellent impact resistance and light resistance. In addition, this alicyclic structure-containing polymer resin has excellent heat resistance, can be molded without decomposition even at high temperatures, and has excellent fluidity when melted. Even with an optical rod, a high-precision light guide can be easily molded without causing molding defects.

The embodiments described above are described for the purpose of facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

[0095]

EXAMPLES The present invention will be described more specifically with reference to Production Examples, Examples and Comparative Examples. However, the present invention is not limited to only these examples.

In the following Production Examples, Examples and Comparative Examples, the methods for measuring various physical properties are as follows. (1) Main chain hydrogenation rate and aromatic ring hydrogenation rate (nuclear hydrogenation rate) were measured by 1H-NMR.

(2) The glass transition temperature is JIS K71
21.

(3) The transparency is such that the total light transmittance is 92%.
◎ (very good) for those above, ○ for 90% or more
(Good), 88% or more: △ (Somewhat bad), 88%
Those less than were rated as poor (poor).

(4) The test piece was tested at a temperature of 80
The specimen was left for 1000 hours in a thermo-hygrostat at 20 ° C. and a humidity of 20%, and evaluated by the presence or absence of moisture absorption deformation (warpage) of the test piece. ◎ (very good) with a warpage of less than 0.2 mm;
２ (good), 0.4 mm or more and less than 0.4 mm
以上 (slightly poor), 0.
Those having a warp of 6 mm or more were evaluated as x (defective).

(5) The mechanical strength was evaluated by impact resistance by a drop test. A 3/4 inch radius missile-type weight (weight 100 g) was dropped naturally from a height of 1 m on the test piece, and observed whether cracks or cracks were formed. ◎ (very good) 1 to 3 or less of 10 sheets ○ (good) 4 to 6 or less of 10 sheets △ (somewhat bad) 7 or more of 10 sheets The sample was evaluated as x (bad).

(6) The formability was evaluated by visually observing the surface of the test piece and determining the presence or absence of defects such as foaming, silver, sink marks, cracks and chips. 0 out of 10 samples without defects ◎ (very good) 1 to 3 out of 10 images ○ (good) 4 to 6 out of 10 images Δ
(Slightly poor) 7 or more out of 10 sheets were evaluated as x (defective).

(7) The light fastness was determined by measuring the total light transmittance of the test piece irradiated with ultraviolet light by a fade meter (black panel temperature: 63 ° C., 720 hours). (Total light transmittance after test / total light before test) ◎ (very good) when the value of (light transmittance) × 100 is 98% or more, and ○ when the value is 96% or more.
(Good), 94% or more: △ (Somewhat bad), 94%
Less than was rated x (bad).

[Production Example 1] (Polymerization) Dehydrated cyclohexane 500 in a nitrogen atmosphere
1-hexene 0.55 parts by weight, dibutyl ether
0.11 parts by weight of terephthalate, triisobutylaluminum 0.1 part by weight.
After mixing 22 parts by weight in a reactor at room temperature and mixing, while maintaining at 45 ° C., 200 parts by weight of tricyclo [4.3.0.1 ^2,5 ] dec-3-ene (hereinafter abbreviated as DCPD), hexachloride 30 parts by weight of a toluene solution of 0.70% by weight of tungsten was continuously added over 2 hours to carry out polymerization.

The resulting polymerization reaction solution was transferred to a pressure-resistant hydrogenation reactor, and 10 parts by weight of a diatomaceous earth-supported nickel catalyst (manufactured by Nissan Gardler Co .; G-96D, nickel loading rate: 58% by weight) and 200 parts by weight of cyclohexane were added. , 150 ° C,
The reaction was carried out at a hydrogen pressure of 45 kgf / cm ² for 8 hours. This solution was filtered using a filter equipped with a stainless steel wire mesh using diatomaceous earth as a filter aid to remove the catalyst. The obtained reaction solution was poured into 3000 parts by weight of isopropyl alcohol with stirring to precipitate a hydrogenated product, which was collected by filtration. Further, after washing with 500 parts by weight of acetone, 1 t
The product was dried for 48 hours in a reduced pressure drier set at 100 ° C. or lower to obtain 190 parts by weight of a hydrogenated ring-opening polymer.

The hydrogenated ring-opened polymer thus obtained had a main chain hydrogenation rate of 99.9% and a weight average molecular weight (Mw) of 3
The glass transition temperature was 3,300.

[Production Example 2] The monomer was 8,9-benzotricyclo [4.3.0.1 ^2,5 ] -dec-3-ene 1
Except that the parts were changed to 00 parts by weight and 100 parts by weight of DCPD, they were prepared in the same manner as in Production Example 1.

The hydrogenation rate of the main chain of the obtained hydrogenated ring-opening polymer was 100%, and the hydrogenation rate of the 6-membered side chain was 99.9.
%, The weight average molecular weight (Mw) was 42,200, and the glass transition temperature was 130 ° C.

[Production Example 3] The monomer was tetracyclo [4.4.0.1 ^2,5 . [ ^1,7,10 ] dodeca-3-ene (hereinafter abbreviated as TCD) in the same manner as in Production Example 1 except that the parts were changed to 100 parts by weight and 100 parts by weight of DCPD.

The hydrogenated ring-opened polymer obtained had a main-chain hydrogenation rate of 100% and a weight average molecular weight (Mw) of 48,
200 and the glass transition temperature was 130 ° C.

[Production Example 4] 8-Methyl-8-methoxycarbonyltetracyclo [4.4.0.1 ^2,5 .
[ ^7,10 ] dodeca-3-ene (10 kg), 1,2-dimethoxymethane (6 kg), cyclohexane (24 kg), 1-hexene (0.9 kg) and diethylaluminum chloride (0.96 mol / l) in a toluene solution (0.34 liter) Added. On the other hand, in another container, 2 liters of a 0.05 mol / l solution of tungsten hexachloride in 1,2-dimethoxymethane and 0.1 mol / l of paraaldehyde were added.
One liter of the 1,2-dimethoxymethane solution was mixed. 0.49 liter of this mixture was added to the mixture in the reaction vessel. The mixture was heated to 80 ° C. and stirred for 3 hours. A 2/8 (weight ratio) mixed solvent of 1,2-dimethoxyethane and cyclohexane was added to the obtained polymer solution to make the polymer / solvent 1/10 (weight ratio), and 2 kg of triethanolamine was added. The mixture was further stirred for 10 minutes. To this polymerization solution, 50 kg of methanol was added to add 3 kg.
The mixture was stirred for 0 minutes and allowed to stand. Except for the upper layer which is separated into two layers,
Methanol was added again, and the mixture was stirred and allowed to stand, and then the upper layer was removed. The same operation was further repeated twice, and the obtained lower layer was appropriately diluted with cyclohexane and 1,2-dimethoxyethane to obtain a cyclohexane-1,2-dimethoxyethane solution having a polymer concentration of 10%. To this solution, 2 kg of palladium / silica magnesia (manufactured by Nikki Chemical Co., Ltd., palladium amount = 5%) was added, and the hydrogen pressure was 40 kg / cm ^{2 in an} autoclave.
At 165 ° C. for 4 hours. This solution was filtered using a filter equipped with a stainless steel wire mesh using diatomaceous earth as a filter aid to remove the catalyst. The hydrogenated polymer solution was poured under stirring with a large amount of methanol to precipitate a hydrogenated product, which was collected by filtration. Further, after washing with methanol, it was dried in a reduced-pressure drier set at 100 ° C. under 1 torr for 48 hours to obtain a hydrogenated ring-opened polymer.

The hydrogenated ring-opened polymer obtained had a main-chain hydrogenation rate of 99.5% and a glass transition temperature of 168 ° C.

[Production Example 5] The monomer was 8-methyl-8-
Methoxycarbonyltetracyclo [4.4.0.1
^2,5 . [ ^7,10 ] dodec-3-ene 5 kg and 5-cyclohexylbicyclo [2.2.1] hept-2-ene 5k
Except having changed to g, it produced similarly to manufacture example 4.

The hydrogenation rate of the main chain of the obtained hydrogenated ring-opening polymer was 99.7%, and the glass transition temperature was 140 ° C.

[Production Example 6] A cyclohexane solution of TCD was continuously supplied from the top of a 1 m ³ polymerization vessel equipped with a stirring blade such that the supply concentration of TCD in the polymerization vessel was 60 kg / m ³ . As catalyst from the polymerization vessel _{top, VO (O · C 2 H} 5) cyclohexane-based solution of Cl _2, vanadium concentration in the polymerization vessel is 0.9 mol / m
At ^3, a cyclohexane solution of ethyl aluminum weir disk chloride de _{(Al (C 2 H 5)} 1.5 Cl 1.5) aluminum concentration in the polymerization vessel 7.2 mol / m
Each was continuously supplied into the polymerization vessel so as to be ³ . In addition, ethylene was added to the polymerization system using a bubbling tube.
m ³ / time, nitrogen 45 m ³ / time, 6 m hydrogen ³ /
Supplied in hours.

A copolymerization reaction was carried out while maintaining the polymerization system in which a heating medium was circulated in a jacket attached to the outside of the polymerization vessel at 10 ° C. The polymerization solution of the copolymer produced by the above-mentioned copolymerization reaction was poured from the top of the polymerization vessel so that the polymerization liquid in the polymerization vessel was always 1 m ³ (that is, the average residence time was 0.1 m ³⁾ .
Withdrawn continuously (5 hours).

The polymerization reaction was terminated by adding a cyclohexane / isopropyl alcohol (1: 1) mixed solution to the extracted polymerization solution. Thereafter, the mixture was brought into contact with an aqueous solution obtained by adding 5 liters of concentrated hydrochloric acid to 1 m ^{3 of} water at a ratio of 1: 1 under strong stirring to transfer the catalyst residue to the aqueous phase. After the contact mixture was allowed to stand, the aqueous phase was separated and removed, and further washed twice with water to purify and separate the polymerization liquid phase.

Next, the polymer solution purified and separated was brought into contact with a three-fold amount of acetone under vigorous stirring to precipitate a copolymer, and then a solid portion (copolymer) was collected by filtration and thoroughly washed with acetone. did. Further, in order to extract unreacted monomer present in the polymer, the solid portion was reduced to 40 kg / m.
After pouring into acetone so as to be ³ , an extraction operation was performed at 60 ° C. for 2 hours. After the extraction treatment, the solid part was collected by filtration, and at 130 ° C. and 350 mmH under nitrogen flow.
g for 12 hours.

The ethylene / T obtained as described above
The CD copolymer has an intrinsic viscosity [η] of 0.42 dl / g,
Tg: 136 ° C., and the TCD content was 41 mol%.

Production Example 7 Bicyclo [2.2.1] hept-2-ene (hereinafter abbreviated as NB) was placed in a reaction vessel charged with 258 liters of cyclohexane at room temperature under a nitrogen stream.
(118 kg) was added and stirred for 5 minutes. Further, triisobutylaluminum was added at a concentration of 1.0 ml /
Liters. Subsequently, ethylene was circulated at normal pressure while stirring to make the inside of the system an ethylene atmosphere. The internal temperature of the autoclave was kept at 70 ° C., and the pressure was increased with ethylene so that the internal pressure became 6 kg / cm ^{2 by} gage pressure. After stirring for 10 minutes, a copolymerization reaction of ethylene and NB was performed by adding 5.0 liter of a toluene solution containing isopropylidene (cyclopentadienyl) (indenyl) zirconium dichloride and methylalumoxane prepared in advance to the system. Was started. The catalyst concentration at this time is 0.015 mmol / l for isopropylidene (cyclopentadienyl) (indenyl) zirconium dichloride and 7.5 mmol / l for methylalumoxane with respect to the whole system.

During the polymerization, ethylene was continuously fed into the system to raise the temperature to 70 ° C. and the internal pressure to 6 kg / g.
cm ² . After 60 minutes, the polymerization reaction was stopped by adding isopropyl alcohol. After depressurization, the polymer solution was taken out, and this solution was treated in the same manner as in Production Example 6 to obtain an ethylene / NB copolymer.

The ethylene / N obtained as described above
B copolymer has intrinsic viscosity [η]: 0.60 dl / g, T
g; 148 ° C., and the NB content was 49 mol%.

Example 1 Polymer 1 produced in Production Example 1
To 00 parts by weight, an antioxidant (manufactured by Ciba Geigy Co .; Irganox 1010, tetrakis [methylene-3-
0.1 parts by weight of (3 ′, 5′-di-tert-butyl-4′-hydroxyphenyl) propionate] methane) was added, and the mixture was kneaded with a twin-screw kneader to form pellets. This pellet was mirror-polished on one side, 1 mm thick x 200 m long
Using a m × 100 mm wide mold, resin temperature 280 ° C.
A test piece was prepared by injection molding at a mold temperature of 80 ° C. Using this test piece, transparency, hygroscopic deformation property, moldability, impact resistance and light resistance were measured. Table 1 shows the results.

Example 2 Using the polymer prepared in Production Example 2, the resin temperature during injection molding was set to 320 ° C., and the mold temperature was set to 1
Pelletization and injection molding were performed in the same manner as in Example 1 except that the temperature was changed to 10 ° C., to prepare test pieces. Using this test piece, transparency, hygroscopic deformation property, moldability, impact resistance and light resistance were measured. Table 1 shows the results.

Example 3 Using the polymer prepared in Production Example 3, the resin temperature during injection molding was set to 320 ° C., and the mold temperature was set to 1
Pelletization and injection molding were performed in the same manner as in Example 1 except that the temperature was changed to 10 ° C., to prepare test pieces. Using this test piece, transparency, hygroscopic deformation property, moldability, impact resistance and light resistance were measured. Table 1 shows the results.

Example 4 Using the polymer prepared in Production Example 4, the resin temperature during injection molding was set to 340 ° C., and the mold temperature was set to 1
Pelletization and injection molding were carried out in the same manner as in Example 1 except that the temperature was changed to 30 ° C., to prepare test pieces. Using this test piece, transparency, hygroscopic deformation property, moldability, impact resistance and light resistance were measured. Table 1 shows the results.

Example 5 Using the polymer prepared in Production Example 5, the resin temperature during injection molding was set to 320 ° C., and the mold temperature was set to 1
Pelletization and injection molding were performed in the same manner as in Example 1 except that the temperature was changed to 10 ° C., to prepare test pieces. Using this test piece, transparency, hygroscopic deformation property, moldability, impact resistance and light resistance were measured. Table 1 shows the results.

Example 6 Using the polymer prepared in Production Example 6, the resin temperature during injection molding was set to 320 ° C., and the mold temperature was set to 1
Pelletization and injection molding were performed in the same manner as in Example 1 except that the temperature was changed to 10 ° C., to prepare test pieces. Using this test piece, transparency, hygroscopic deformation property, moldability, impact resistance and light resistance were measured. Table 1 shows the results.

Example 6 Using the polymer prepared in Production Example 6, the resin temperature during injection molding was set to 320 ° C., and the mold temperature was set to 1
Pelletization and injection molding were performed in the same manner as in Example 1 except that the temperature was changed to 10 ° C., to prepare test pieces. Using this test piece, transparency, hygroscopic deformation property, moldability, impact resistance and light resistance were measured. Table 1 shows the results.

Comparative Example 1 Example 1 was repeated except that the resin temperature during injection molding was changed to 320.degree. C. and the mold temperature was changed to 110.degree. C. using polycarbonate (Panlite-122 manufactured by Teijin Chemicals Ltd.). Similarly, injection molding was performed to prepare a test piece. Using this test piece, transparency, hygroscopic deformation, moldability,
Impact resistance and light resistance were measured. Table 1 shows the results.

Comparative Example 2 Injection molding was performed in the same manner as in Example 1 using polymethyl methacrylate (Acrypet VH manufactured by Mitsubishi Rayon Co., Ltd.) to prepare a test piece. Using this test piece, transparency, hygroscopic deformation property, moldability, impact resistance and light resistance were measured. Table 1 shows the results.

[0131]

[Table 1] In the evaluation of the moldability shown in Table 1, in Comparative Example 1, silver and sink marks were formed on the surface of the molded product, and the light transmittance was low. Warpage was observed after the moisture absorption test, and a decrease in light transmittance was observed after the light resistance test. In Comparative Example 2, impact resistance was low, and warpage was observed after the moisture absorption test. From the results shown in Table 1, the light guide of the vehicular lamp made of the alicyclic structure-containing polymer resin of the present invention is thinner and has a larger flow length than conventional materials. It turns out that it is excellent in transparency. At the same time, it is understood that the mechanical strength, the hygroscopic deformation property, and the light resistance are also good.

[0132]

As described above, according to the present invention, a well-balanced vehicular lamp having excellent transparency, moldability, and resistance to deformation due to moisture absorption, good impact resistance and light resistance, and used for the same. A light guide can be provided.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment (tail lamp) of a vehicular lamp of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a front view illustrating a dot printing unit according to the first embodiment.

FIG. 4 is a cross-sectional view showing a second embodiment (tail lamp) of the vehicular lamp of the present invention.

FIG. 5 is a cross-sectional view showing a modification of the second embodiment shown in FIG.

FIG. 6 is an exploded perspective view showing a third embodiment (high-mount stop lamp) of the vehicular lamp of the present invention.

FIG. 7 is a sectional view taken along line VII-VII in FIG. 6;

FIG. 8 is a perspective view showing a light guide bar according to a third embodiment shown in FIG.

FIG. 9 is a sectional view taken along line IX-IX in FIG. 6;

FIG. 10 is a diagram showing a light distribution action of the light guide bar according to the third embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 11 ... Back case 12 ... Front case 13 ... Lamp (light source) 14 ... Light guide 141, 142 ... Incident surface 15 ... Lamp room

Claims (3)

[Claims] 1. A light guide for a vehicle lamp, which is provided in a lamp chamber of the vehicle lamp and has an incident surface through which light from a light source is introduced and an exit surface through which the incident light is emitted to the outside, has a glass transition. A light guide for a vehicular lamp, comprising a polymer resin having an alicyclic structure having a temperature of 90 ° C. or higher. 2. The light guide according to claim 1, wherein the alicyclic structure-containing polymer resin is a norbornene-based polymer resin. 3. A case for forming a lamp chamber, the light guide according to claim 1 provided in the lamp chamber, and light incident on an incident surface of the light guide provided in the lamp chamber. A vehicular lamp comprising a light source for irradiating.