KR20190057156A - Polycarbonate resin composition and optical molded article - Google Patents

Abstract

0.005 to 3.0 parts by weight of a melt viscosity adjusting agent (B) and 0.005 to 1.0 part by weight of a phosphorous ester compound (C) relative to 100 parts by weight of a polycarbonate resin (A) The ratio η1 / η2 of the melt viscosity η1 of the polycarbonate resin composition to the melt viscosity η2 of the polycarbonate resin (A) is 0.45 (η1), where η is the melt viscosity at a temperature of 220 ° C. and a shear rate of 10 sec ^-1 , ?? 1 /? 2? 0.95.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a polycarbonate resin composition,

The present invention relates to a polycarbonate resin composition and an optical molded article.

Polycarbonate resins have been used in molded articles such as light guide plates, various lenses, and nameplates so far in terms of excellent impact resistance, heat resistance and transparency.

For example, Patent Document 1 discloses an aromatic polycarbonate resin composition for a light guide plate in which a stabilizer and a release agent are blended with an aromatic polycarbonate resin in which the ratio of the weight average molecular weight to the number average molecular weight is specified within a specific range .

Patent Document 2 discloses a polycarbonate resin composition for optical molded articles in which a polycarbonate resin is mixed with polystyrene and one kind of phosphorus-based antioxidant.

In addition, as disclosed in, for example, Patent Documents 3 to 6, various resin compositions using polycarbonate resin and other materials in combination to obtain an excellent light transmittance and to improve the brightness of optical members have been proposed have.

However, the polycarbonate resin compositions disclosed in Patent Documents 3 to 6 have a problem in that the light transmittance is not lowered even in the case of recent demands for a material of a light guide plate (in particular, in case of molding at a high temperature for thin- And the like) can not be sufficiently satisfied.

Japanese Patent Application Laid-Open No. 2007-204737 Japanese Patent Application Laid-Open No. 09-020860 Japanese Patent Laid-Open No. 11-133647 Japanese Patent Application Laid-Open No. 11-158364 Japanese Patent Application Laid-Open No. 2001-215336 Japanese Patent Application Laid-Open No. 2004-051700

An object of the present invention is to provide a polycarbonate resin which is excellent in heat resistance, mechanical strength and other properties inherent to polycarbonate resin, has excellent thermal stability, has a high light transmittance and is excellent in light transmittance even when molded at a high temperature To provide a resin composition.

The inventors of the present invention have conducted intensive studies to solve these problems and have found that a polycarbonate resin composition comprising a polycarbonate resin (A) blended with a melt viscosity adjuster (B) and a phosphorous ester compound (C) , So that the ratio of the melt viscosity of the polycarbonate resin composition and the melt viscosity of the polycarbonate resin (A) contained therein satisfies the value in the specific range, so that even when molded at a high temperature, the light transmittance does not decrease The present inventors have found that a polycarbonate resin composition having excellent color and brightness can be obtained, thereby completing the present invention.

That is, the present invention relates to a polycarbonate resin composition comprising 0.005 to 3.0 parts by weight of a melt viscosity adjuster (B) and 0.005 to 1.0 part by weight of a phosphorous ester compound (C) per 100 parts by weight of a polycarbonate resin (A) Wherein the melt viscosity η1 of the polycarbonate resin composition and the melt viscosity η2 of the polycarbonate resin (A) are in the range of the melt viscosity η at a measurement temperature of 220 ° C. and a shear rate of 10 sec ^-1 , ? 1 /? 2 satisfies 0.45?? 1 /? 2? 0.95, and an optical molded article obtained by molding the polycarbonate resin composition.

INDUSTRIAL APPLICABILITY The polycarbonate resin composition of the present invention is excellent in heat resistance and weather resistance without deteriorating the inherent properties of the polycarbonate resin such as heat resistance and mechanical strength and also has a light transmittance It is excellent. Therefore, even a thin light guide plate having a thickness of, for example, about 0.3 mm is less likely to be deteriorated in appearance due to a change in hue, or in a case where the resin itself is deteriorated through high-temperature molding, and thus has a very high industrial value.

Hereinafter, embodiments will be described in detail. However, the detailed description may be omitted more than necessary. For example, there is a case where a detailed description of a well-known item or a duplicate description of a substantially same configuration is omitted. This is to make it easier for a person skilled in the art to avoid the following description unnecessarily redundant.

Further, the inventors shall provide the following description for a person skilled in the art to fully understand the present invention, and are not intended to limit the subject matter described in the claims.

The polycarbonate resin composition used in the present invention is a mixture of a polycarbonate resin (A), a melt viscosity adjuster (B), and a phosphorous ester compound (C). In the polycarbonate resin composition used in the present invention, other components may be blended if necessary.

The polycarbonate resin (A) to be used in the present invention can be produced by a phosgene method in which various dihydroxy diaryl compounds are reacted with phosgene or a phosgene method in which a dihydroxy diaryl compound is reacted with a carbonic ester such as diphenyl carbonate Is a polymer obtained by an ester exchange method. Representative examples include polycarbonate resins prepared from 2,2-bis (4-hydroxyphenyl) propane (bisphenol A).

Examples of the dihydroxy diaryl compound include bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2- Phenyl) butane, 2,2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2- Bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxy- (Dibromophenyl) propane, and 2,2-bis (4-hydroxy-3,5-dichlorophenyl) propane; Bis (hydroxyaryl) cycloalkanes such as 1,1-bis (4-hydroxyphenyl) cyclopentane and 1,1-bis (4-hydroxyphenyl) cyclohexane; Dihydroxydialyl ethers such as 4,4'-dihydroxydiphenyl ether and 4,4'-dihydroxy-3,3'-dimethyl diphenyl ether; Dihydroxydialylsulfides such as 4,4'-dihydroxydiphenyl sulfide; Dihydroxydialylsulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyl diphenyl sulfoxide; Dihydroxydiarylsulfone such as 4,4'-dihydroxydiphenylsulfone and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone, and these may be used singly or in combination of two or more . In addition to these, piperazine, dipiperidyl hydroquinone, resorcin, 4,4'-dihydroxydiphenyl and the like may be mixed and used.

The dihydroxy diaryl compound may be further mixed with, for example, a trivalent or higher phenol compound shown below.

Examples of the trivalent or higher phenol compound include fluoroglucin, 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) -heptene, 2,4,6- Tri- (4-hydroxyphenyl) -heptane, 1,3,5-tri- (4-hydroxyphenyl) Ethane and 2,2-bis- [4,4- (4,4'-dihydroxydiphenyl) -cyclohexyl] -propane.

The viscosity average molecular weight of the polycarbonate resin (A) is preferably 10,000 to 100,000, and more preferably 12,000 to 30,000. In addition, when preparing such polycarbonate resin (A), a molecular weight regulator, a catalyst and the like can be used as needed.

The melt viscosity adjusting agent (B) used in the present invention acts as a kind of lubricant when the polycarbonate resin composition is molded and processed to lower the shear viscosity of the polycarbonate resin, Means that the heat generation is suppressed from occurring more than necessary, and further, the function of reducing or suppressing heat generation in the polycarbonate resin is provided.

The melting viscosity η1 of the polycarbonate resin composition and the melt viscosity (η1) of the polycarbonate resin (A), when the melt viscosity at the measurement temperature of 220 ° C. and the shear rate of 10 sec ^-1 is η, There are no particular limitations as long as the ratio? 1 /? 2 of the viscosity? 2 can be adjusted so as to satisfy 0.45?? 1 /? 2? 0.95, but typical examples thereof include polyether derivatives represented by the following general formula (1) . In addition, a silicone compound, a glycerin compound, a pentaerythritol compound, and the like may be used.

In general formula (1):

(Wherein R and R 'are each independently a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X is an alkylene group having 2 to 4 carbon atoms, Y is a branched alkylene group having 3 to 5 carbon atoms, Each independently represents an integer of 3 to 60, and m + n represents an integer of 8 to 90)

Examples of the polyether derivative represented by the general formula (1) include modified glycols including a tetramethylene glycol unit and a 1-ethylethylene glycol unit (for example, HO- (CH ₂ CH ₂ CH ₂ CH ₂ O) ₂₄ (CH ₂ CH (C ₂ H ₅ ) O) ₁₃ -H and the like, for example DCD-2000 (weight average molecular weight 2000) manufactured by Nichiyu Corporation. The weight average molecular weight of the polyether derivative represented by the general formula (1) is preferably 1000 to 4000.

The polyether derivative is preferably a polyether derivative represented by the following general formula (2), (3) or (4) in the polyether derivative represented by the general formula (1)

The general formula (2)

(Wherein m and n each independently represent an integer of 3 to 60, and m + n represents an integer of 8 to 90)

Examples of the polyether derivative represented by the general formula (2) include modified glycols including a tetramethylene glycol unit and a 2-methyltetramethylene glycol unit (for example, HO- (CH ₂ CH ₂ CH ₂ CH ₂ O) ₂₂ ( _{CH 2 CH 2 CH (CH 3} ) CH 2 O) 5 -H , etc.) may be mentioned, for example, the Hodogaya Kagaku Kogyo (Co., Ltd.) of PTG-L1000 (weight average molecular weight 1000), PTG-L2000 ( Weight average molecular weight 2000), or PTG-L3000 (weight average molecular weight 3000). The weight average molecular weight of the polyether derivative represented by the general formula (2) is preferably 1000 to 4000.

The general formula (3)

(Wherein m and n each independently represent an integer of 3 to 60, and m + n represents an integer of 8 to 90)

Examples of the polyether derivative represented by the general formula (3) include modified glycols including an ethylene glycol unit and a propylene glycol unit (for example, C ₄ H ₉ O- (CH ₂ CH ₂ O) ₂₁ (CH ₂ CH (CH ₃ ) O ₁₄ -H, C ₄ H ₉ O- (CH ₂ CH ₂ O) ₃₀ (CH ₂ CH (CH ₃ ) O) ₃₀ -H and the like are suitable. For example, UniLube 60MB- Weight average molecular weight 1700) or UniLube 50MB-72 (weight average molecular weight 3000) are commercially available. The weight average molecular weight of the polyether derivative represented by the general formula (3) is preferably 1000 to 4000.

In general formula (4):

(Wherein m and n each independently represent an integer of 3 to 60, and m + n represents an integer of 8 to 90)

Examples of the polyether derivative represented by the general formula (4) include modified glycols including an ethylene glycol unit and a propylene glycol unit (e.g., HO- (CH ₂ CH ₂ O) ₁₇ (CH ₂ CH (CH ₃ ) O) ₁₇ -H is suitable, for example, Unirov 50 DE-25 (weight average molecular weight 1750), etc. The polyether derivative represented by the general formula (4) has a weight average molecular weight of 1000 to 4000 desirable.

Up to now, attempts have been made to improve the light transmittance of polycarbonate resins by adding straight-chain polyoxyalkylene glycols. However, since the polyoxyalkylene glycols have insufficient heat resistance, the polyoxyalkylene glycols When a polycarbonate resin composition is molded at a high temperature, the brightness and the light transmittance of the molded article are lowered. On the other hand, the melt viscosity modifier such as the polyether derivative represented by the general formula (1) is a bifunctional random copolymer which is high in heat resistance and contains a specific polyether derivative represented by the general formula (1) A molded article molded from a polycarbonate resin composition at a high temperature has a high luminance and a high light transmittance.

The melt viscosity regulator (B) used in the present invention is also excellent in compatibility with the polycarbonate resin (A) because it has an appropriate lipophilicity, and therefore, polycarbonate containing the melt viscosity regulator (B) The transparency of the molded article obtained from the late resin composition is also improved. The weight average molecular weight of the polyether derivative used in the melt viscosity adjusting agent (B) is preferably 1000 to 4000, more preferably 2000 to 3000. When the weight average molecular weight of the polyether derivative is 1000 to 4000, a sufficient improvement in light transmittance can be expected, and the light transmittance is not lowered because the degree of discoloration is not increased.

The amount of the polyether derivative is 0.005 to 3.0 parts by weight, preferably 0.1 to 1.5 parts by weight, and more preferably 0.3 to 1.2 parts by weight based on 100 parts by weight of the polycarbonate resin (A). When the amount of the polyether derivative is less than 0.005 part by weight, the effect of improving the light transmittance and hue is insufficient. On the contrary, when the amount of the polyether derivative is more than 3.0 parts by weight, the conversation ratio increases and the light transmittance decreases.

In the polycarbonate resin composition of the present invention, a phosphorous ester compound (C) is blended together with a melt viscosity adjuster (B) such as a specific polyether derivative. Thus, by simultaneously mixing the melt viscosity adjuster (B) and the phosphorous ester compound (C), it is possible to prevent the polycarbonate resin composition from generating as much heat as possible, and the polycarbonate resin (A) It is possible to obtain a polycarbonate resin composition having improved light transmittance even when molded at high temperature without deteriorating inherent characteristics such as heat resistance and mechanical strength.

As the phosphorous acid ester compound (C) used in the present invention, for example, a compound represented by the following general formula (5) is particularly suitable.

(Wherein R ¹ represents an alkyl group having 1 to 20 carbon atoms and a represents an integer of 0 to 3)

In the general formula (5), R ¹ is an alkyl group having 1 to 20 carbon atoms, and further preferably an alkyl group having 1 to 10 carbon atoms.

Examples of the compound represented by the general formula (5) include triphenylphosphite, tricresylphosphite, tris (2,4-di-t-butylphenyl) phosphite, trisnonylphenylphosphite, . Among these, tris (2,4-di-t-butylphenyl) phosphite is particularly suitable, and for example, Irgafos 168 ("Irugafos" manufactured by BASF) is a registered trademark of BASF Societas Europia ). ≪ / RTI >

Examples of the phosphorous acid ester compound include, for example, a compound represented by the following general formula (6) in addition to the compound represented by the general formula (5).

(Wherein R ² , R ³ , R ⁵ and R ⁶ are each independently a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkylcycloalkyl group having 6 to 12 carbon atoms, R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, X represents a single bond, a sulfur atom or a group represented by the formula: -CHR ⁷ - (wherein R ⁷ represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms An alkyl group or a cycloalkyl group having 5 to 8 carbon atoms, A represents an alkylene group having 1 to 8 carbon atoms or a group represented by the formula: -COR ⁸ - (wherein R ⁸ is a single bond or an alkyl having 1 to 8 carbon atoms Y represents a hydroxyl group, an alkoxy group of 1 to 8 carbon atoms, or an aralkyloxy group of 7 to 12 carbon atoms, and Y represents a hydrogen atom or an alkyl group of 1 to 8 carbon atoms, On the other hand, Or an alkyl group having 1 to 8 carbon atoms)

In the general formula (6), R ² , R ³ , R ⁵ and R ⁶ are each independently a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkylcycloalkyl group having 6 to 12 carbon atoms, An aralkyl group having 7 to 12 carbon atoms, or a phenyl group.

Examples of the alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i- Butyl group, i-octyl group, t-octyl group, 2-ethylhexyl group and the like. Examples of the cycloalkyl group having 5 to 8 carbon atoms include a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group. Examples of the alkylcycloalkyl group having 6 to 12 carbon atoms include a 1-methylcyclopentyl group, a 1-methylcyclohexyl group and a 1-methyl-4-i-propylcyclohexyl group. Examples of the aralkyl group having 7 to 12 carbon atoms include benzyl group,? -Methylbenzyl group,?,? - dimethylbenzyl group and the like.

Each of R ² , R ³ and R ⁵ is independently an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, or an alkylcycloalkyl group having 6 to 12 carbon atoms. In particular, it is preferable that each of R ² and R ⁵ is independently a t-alkyl group such as a t-butyl group, a t-pentyl group or a t-octyl group, a cyclohexyl group or a 1-methylcyclohexyl group. Particularly, R ³ is a group having 1 to 5 carbon atoms such as a methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec- Alkyl group, more preferably a methyl group, a t-butyl group or a t-pentyl group.

R ⁶ is preferably a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms, and is preferably a hydrogen atom, a methyl group, an ethyl group, a n-propyl group, More preferably an alkyl group having 1 to 5 carbon atoms such as methyl, ethyl, propyl, butyl, sec-butyl, t-butyl or t-pentyl.

In the general formula (6), R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Examples of the alkyl group having 1 to 8 carbon atoms include the alkyl groups exemplified in the description of R ² , R ³ , R ⁵ and R ⁶ above. In particular, R ⁴ is preferably a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, more preferably a hydrogen atom or a methyl group.

In the general formula (6), X represents a single bond, a sulfur atom or a group represented by the formula: -CHR ⁷ -. Here, R ⁷ in the formula: -CHR ⁷ - represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms. Examples of the alkyl group having 1 to 8 carbon atoms and the cycloalkyl group having 5 to 8 carbon atoms include the alkyl and cycloalkyl groups exemplified in the description of R ² , R ³ , R ⁵ and R ⁶ , respectively. Particularly, X is preferably a single bond, a methylene group, or a methylene group substituted with a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group or a t- Bond.

In the general formula (6), A represents an alkylene group having 1 to 8 carbon atoms or a group represented by the formula: -COR ⁸ -. Examples of the alkylene group having 1 to 8 carbon atoms include methylene, ethylene, propylene, butylene, pentamethylene, hexamethylene, octamethylene, 2,2-dimethyl- And preferably a propylene group. Further, R ⁸ in the formula: -COR ⁸ - represents a single bond or an alkylene group having 1 to 8 carbon atoms. Examples of the alkylene group having 1 to 8 carbon atoms which represents R ⁸ include the alkylene groups exemplified in the description of A above. R ⁸ is preferably a single bond or an ethylene group. In the formula: * -COR ⁸ -, * indicates the bond on the oxygen side, indicating that the carbonyl group is bonded to the oxygen atom of the phosphite group.

In the general formula (6), Y and Z represent either a hydroxyl group, an alkoxy group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, and the other is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms . Examples of the alkoxy group having 1 to 8 carbon atoms include a methoxy group, an ethoxy group, a propoxy group, a t-butoxy group, and a pentyloxy group. Examples of the aralkyloxy group having 7 to 12 carbon atoms include benzyloxy group,? -Methylbenzyloxy group,?,? - dimethylbenzyloxy group and the like. Examples of the alkyl group having 1 to 8 carbon atoms include the alkyl groups exemplified in the description of R ² , R ³ , R ⁵ and R ⁶ above.

Examples of the compound represented by the general formula (6) include 2,4,8,10-tetra-t-butyl-6- [3- (3-methyl-4-hydroxy- Propoxy] dibenzo [d, f] [1,3,2] dioxaphospepine, 6- [3- (3,5- 4,8,10-tetra-t-butyldibenzo [d, f] [1,3,2] dioxaphosphepin, 6- [3- (3,5- Dibenzo [d, g] [l, 3,2] dioxaphosphosine, 6- [3- (3-methylphenyl) propoxy] -4,8-di- , 5-di-t-butyl-4-hydroxyphenyl) propionyloxy] -4,8-di-t- butyl-2,10- 2] dioxaphosphosine, and the like. Among them, in the case where the polycarbonate resin composition to be obtained is used in an area where optical characteristics are particularly required, 2,4,8,10-tetra-t-butyl-6- [3- (3- -Hydroxy-5-t-butylphenyl) propoxy] dibenzo [d, f] [1,3,2] dioxaphosphepine is suitable, and for example, Sumilite GP (&Quot; Smilizer " is a registered trademark).

As the phosphorous acid ester compound (C), for example, a compound represented by the general formula (7) may be suitably used in addition to the compound represented by the general formula (5) and the compound represented by the general formula (6) have.

(Wherein R ⁹ and R ¹⁰ each independently represent an alkyl group having 1 to 20 carbon atoms or an aryl group optionally substituted with an alkyl group, and b and c each independently represent an integer of 0 to 3)

As the compound represented by the general formula (7), for example, ADEKA STEP PEP-36 ("ADEKA STAP" registered trademark) manufactured by ADEKA is commercially available.

The amount of the phosphorous ester compound (C) is 0.005 to 1.0 part by weight, preferably 0.01 to 0.5 part by weight, more preferably 0.02 to 0.1 part by weight, per 100 parts by weight of the polycarbonate resin (A). When the amount of the phosphorous ester compound (C) is less than 0.005 parts by weight, the effect of improving the light transmittance and hue is insufficient. Conversely, even when the amount of the phosphorous ester compound (C) exceeds 1.0 part by weight, the effect of improving the light transmittance and hue is insufficient.

In addition to the above components, the polycarbonate resin composition according to the embodiment may contain, for example, an ultraviolet absorber which is a component for further improving the weather resistance of the obtained polycarbonate resin composition, for use as a molded article obtained by molding a polycarbonate resin composition Can be suitably used.

Examples of the ultraviolet absorber include ultraviolet absorbers usually used in polycarbonate resins, such as benzotriazole-based compounds, triazine-based compounds, benzophenone-based compounds, and oxalic acid anilide based compounds, Can be used.

Examples of the benzotriazole compound include 2- (2-hydroxy-5-t-octylphenyl) benzotriazole, 2- (3-tert- Methylphenyl) -5-chloro-2H-benzotriazole, 2- (3,5-di-tert-pentyl-2-hydroxyphenyl) (4-methyl-6- (3,4,5,6-tetrahydrophthalimidylmethyl) phenol, 2- (2-hydroxy-4-octyloxyphenyl) -2H-benzotriazole, 2- (2-hydroxy-3,5-di (1,1-dimethylbenzyl) phenyl] -2H-benzotriazole , And 2,2'-methylenebis [6- (2H-benzotriazol-2-yl) 4- (1,1,3,3-tetramethylbutyl) phenol]. Among them, particularly preferred are 2- (2-hydroxy-5-t-octylphenyl) benzotriazole and the like. Examples thereof include TINUVIN 329 (TINUVIN is a registered trademark) SISOV 709 manufactured by Kasei Co., Ltd. and KEMOV 79 manufactured by KEMIPRO GAS Co., Ltd. are commercially available.

Examples of the triazine compound include 2,4-diphenyl-6- (2-hydroxyphenyl-4-hexyloxyphenyl) 1,3,5-triazine, 2- [ Dimethylphenyl) -1,3,5-triazin-2-yl] -5- (octyloxy) phenol, 2- (4,6- ) -5 - [(hexyl) oxy] phenol, and the like, for example, Tinuvin 1577 manufactured by BASF is commercially available.

As the oxalanilide compound, for example, Sanduvor VSU manufactured by Clariant Japan Co., Ltd. is commercially available.

Examples of the benzophenone-based compound include 2,4-dihydroxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, and the like.

The amount of the ultraviolet absorber is preferably 0 to 1.0 part by weight, more preferably 0 to 0.5 part by weight based on 100 parts by weight of the polycarbonate resin (A). If the amount of the ultraviolet absorber (D) exceeds 1.0 part by weight, the initial color of the obtained polycarbonate resin composition may be lowered. When the amount of the ultraviolet absorber (D) is 0.1 parts by weight or more, the effect of further improving the weather resistance of the polycarbonate resin composition is particularly exhibited.

The polycarbonate resin composition according to the embodiment may contain various additives such as other antioxidants, coloring agents, releasing agents, softening agents, antistatic agents, impact modifiers and the like in the range of not damaging the effects of the present invention, A polymer other than the polycarbonate resin (A) may be suitably blended.

The method for producing the polycarbonate resin composition is not particularly limited, and the polycarbonate resin (A), the melt viscosity adjuster (B) and the phosphorous ester compound (C), if necessary, A method of appropriately adjusting the kind and amount of each component and a method of mixing them with a known mixer such as a tumbler or a ribbon blender with respect to a polymer other than the resin (A), or a method of melt-kneading with an extruder have. By these methods, pellets of the polycarbonate resin composition can be easily obtained.

The shape and size of the pellets of the polycarbonate resin composition obtained as described above are not particularly limited and may be the shape and the size of a general resin pellet. Examples of the shape of the pellets include elliptical columnar shapes, columnar shapes, and the like. The pellet preferably has a length of about 2 to 8 mm. In the case of an elliptical pellet, the pellet preferably has a long diameter of about 2 to 8 mm and a short diameter of about 1 to 4 mm, It is preferable that the diameter of the cross section circle is about 1 to 6 mm. Each of the obtained pellets may be of such a size, and all of the pellets forming the pellet aggregate may be of such a size, and the average value of the pellet aggregate may be of such a size, and there is no particular limitation.

The polycarbonate resin composition of the present invention is obtained by molding a polycarbonate resin composition obtained as described above.

The method for producing the polycarbonate resin composition of the present invention is not particularly limited, and for example, a method of molding a polycarbonate resin composition by a known injection molding method, compression molding method and the like can be given.

As described above, the embodiment has been described as an example of the present invention. However, the technique of the present invention is not limited to this, but may be applied to embodiments in which appropriate changes, substitutions, additions, omissions, etc. are made.

Example

Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to these Examples. Unless otherwise stated, " part " and "% " are by weight.

The following materials were used as raw materials.

1. Polycarbonate resin (A):

Polycarbonate resin synthesized from bisphenol A and carbonyl chloride

Caliber 200-80

Caliber "(trade name, manufactured by Sumikastaron Polycarbonate Co., Ltd.) is a registered trademark of Star Theory Europe GmbH, viscosity average molecular weight: 15,000, hereinafter referred to as" PC "

2. Melt viscosity modifier (B) (polyether derivative of the formula:

2-1. Modified glycols (polyether derivatives) comprising a tetramethylene glycol unit and a 2-methyltetramethylene glycol unit:

(Trade name, manufactured by Hodogaya Chemical Industry Co., Ltd., weight average molecular weight: 2000, hereinafter referred to as " compound B1 &

2-2. Modified glycols (polyether derivatives) comprising a tetramethylene glycol unit and a 1-ethylethylene glycol unit:

(Trade name, manufactured by Nichiyu Corporation, weight average molecular weight: 2000, hereinafter referred to as " compound B2 &

2-3. Modified glycols (polyether derivatives) comprising an ethylene glycol unit and a propylene glycol unit:

UniLube 50MB-72

(Trade name, manufactured by Nichiyu Corporation, weight average molecular weight: 3000, hereinafter referred to as " compound B3 &

2-4. Modified glycols (polyether derivatives) comprising an ethylene glycol unit and a propylene glycol unit:

UniLube 60MB-26I

(Trade name, manufactured by Nippon Oil Corporation, weight average molecular weight: 1700, hereinafter referred to as " compound B4 &

2-5. Modified glycols (polyether derivatives) comprising an ethylene glycol unit and a propylene glycol unit:

UniLube 50DE-25

(Weight average molecular weight: 1750, hereinafter referred to as " compound B5 "

3. Phosphoric ester compound (C):

3-1. Tris (2,4-di-t-butylphenyl) phosphite represented by the following formula

Irga Force 168

(Trade name, manufactured by BASF, hereinafter referred to as " compound C1 &

3-2. Tetra-t-butyl-6- [3- (3-methyl-4-hydroxy-5-t-butylphenyl) propoxy] dibenzo [d , f] [1,3,2] dioxaphosphperine

Smilie's GP

(Trade name, manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as "compound C2"),

3-3. (2,6-di-tert-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5 , 5] undeca

Adeka Staff PEP-36

(Trade name, manufactured by Adeka Co., Ltd., hereinafter referred to as " compound C3 &

(Examples 1 to 17 and Comparative Examples 1 to 6)

Each of the raw materials was charged into a tumbler at a ratio shown in Tables 1 and 2, and the mixture was dry mixed for 10 minutes and then melt-kneaded using a twin-screw extruder (TEX30 alpha, manufactured by Nippon Express Co., And melt-kneaded to obtain pellets of a polycarbonate resin composition. In addition, the pellets obtained in Examples and Comparative Examples were almost elliptical, and the aggregate including 100 pellets had an average length of about 5.1 mm to about 5.4 mm, an average value of long diameter of the section ellipse of about 4.1 mm To about 4.3 mm, and an average value of the short diameter was about 2.2 mm to about 2.3 mm.

Using the obtained pellets, test pieces for evaluation were prepared according to the following methods and provided for evaluation. The results are shown in Tables 1 and 2.

(Method of measuring melt viscosity)

The obtained pellets and the pellets of the polycarbonate resin (A) were dried at 120 ° C. for 4 hours or more, and then measured using a capillary rheometer (flow tester CFT-500, manufactured by Shimadzu Seisakusho Co., Ltd.) ℃, to measure the melt viscosity at a shear rate range of 1sec to 100sec ^{-1 -1.} The melt viscosity of the polycarbonate resin composition at a shear rate of 10 sec ^-1 is eta 1, and the melt viscosity of the polycarbonate resin (A) is eta 2.

(Production method of test piece)

The obtained pellets were dried at 120 DEG C for 4 hours or more and then dried at a molding temperature of 360 DEG C and a mold temperature of 80 DEG C using an injection molding machine (ROBOSHOT S2000i100A) A multi-purpose test piece A (total length 168 mm x thickness 4 mm) was produced. The end face of the test piece was cut and mirror-finished with a cut end face of the resin plate end face side mirror surface (Flavine PB-500, manufactured by Megaro Technica Co., Ltd.).

(Evaluation method of integrated transmittance)

A light source attachment device was installed in a spectrophotometer (UH4150, manufactured by Hitachi Seisakusho Co., Ltd.), and a 50 W halogen lamp was used as a light source, and a mask of 5.6 mm x 2.8 mm before the light source and 6.0 mm x 2.8 mm In the used state, the spectral transmittance of each test piece per 1 nm in a wavelength range of 380 to 780 nm was measured with respect to the total length direction of the test piece. The measured spectral transmittance was integrated and rounded to 10, thereby obtaining respective integrated transmittance. The integrated transmittance of 30,000 or more is good (indicated by o in the table) and less than 30,000 is considered poor (indicated by x in the table).

(Evaluation method of yellowness index)

Based on the spectral transmittance measured in the above-mentioned evaluation method of the integrated transmittance, each of the yellowness degrees was obtained at a 10-degree field of view using a standard light source D65. In addition, the degree of yellowness was 20 or less (indicated by o in the table), and the degree of deficiency exceeding 20 (indicated by x in the table).

The polycarbonate resin compositions of Examples 1 to 18 were prepared by mixing a polycarbonate resin (A) with a melt viscosity adjusting agent (B) such as a specific polyether derivative and a phosphorous ester compound (C) . Therefore, a test piece molded from the polycarbonate resin composition has a high integrated transmittance and a low yellowing degree.

As described above, the polycarbonate resin compositions of Examples 1 to 18 are excellent in heat resistance inherent in the polycarbonate resin (A), have high light transmittance in the visible region, and are molded at a high temperature It is also excellent in light transmittance. A molded product obtained by molding such a polycarbonate resin composition is excellent in hue because of its low yellowness and excellent in hue even when it is molded at a high temperature.

On the other hand, in the polycarbonate resin composition of Comparative Example 1, the amount of the melt viscosity regulator (compound B1) such as a specific polyether derivative is small, so that the integrated transmittance is low and the yellow color degree is large. Thus, the molded article obtained by molding the polycarbonate resin composition of Comparative Example 1 has poor brightness and color.

In the polycarbonate resin composition of Comparative Example 2, since the amount of a specific melt viscosity regulator (Compound B1) was large, the integrated transmittance was low and the yellow color degree was large. As described above, the molded article obtained by molding the polycarbonate resin composition of Comparative Example 2 has poor brightness and color.

In the polycarbonate resin composition of Comparative Example 3, since the amount of the phosphorous acid ester compound (C) was small, the test piece had a high yellowing degree. As described above, the molded article molded from the polycarbonate resin composition of Comparative Example 3 is inferior in color.

In the polycarbonate resin composition of Comparative Example 4, since the amount of the phosphorous ester compound (C) is large, the integrated transmittance is low and the yellow color degree is large. Thus, the molded article obtained by molding the polycarbonate resin composition of Comparative Example 4 has poor brightness and color.

In the polycarbonate resin composition of Comparative Example 5, since the specific amount of the melt viscosity regulator (compound B5) is small, the integrated transmittance is low and the yellow color degree is large. As described above, the molded article obtained by molding the polycarbonate resin composition of Comparative Example 5 has poor brightness and color.

In the polycarbonate resin composition of Comparative Example 6, since the amount of the specific melt viscosity regulator (compound B5) is large, the integrated transmittance is low and the yellow color degree is large. As described above, the molded article obtained by molding the polycarbonate resin composition of Comparative Example 5 has poor brightness and color.

As described above, the embodiments of the technique of the present invention have been described. Therefore, a detailed explanation has been provided.

Therefore, among the constituent elements described in the detailed description, not only essential constituent elements for solving the problems, but also constituent elements not essential for solving the problems in order to exemplify the above-described technology can be included. Accordingly, such non-essential components should be recited in the detailed description, and such non-essential components should not be regarded as essential.

Furthermore, since the above-described embodiments are for illustrating the technique of the present invention, various changes, substitutions, additions, and omissions can be made within the scope of the claims or equivalents thereof.

INDUSTRIAL APPLICABILITY The polycarbonate resin composition of the present invention is excellent in heat resistance and weather resistance without deteriorating the inherent properties of the polycarbonate resin such as heat resistance and mechanical strength and also has a light transmittance It is excellent. Therefore, even a thin light guide plate having a thickness of, for example, about 0.3 mm is less likely to be deteriorated in appearance due to a change in hue, or in a case where the resin itself is deteriorated through high-temperature molding, and thus has a very high industrial value.

Claims (9)

0.005 to 3.0 parts by weight of a melt viscosity adjusting agent (B) and 0.005 to 1.0 part by weight of a phosphorous ester compound (C) relative to 100 parts by weight of a polycarbonate resin (A)
The ratio η1 / η2 of the melt viscosity η1 of the polycarbonate resin composition to the melt viscosity η2 of the polycarbonate resin (A) is in the range of η1 / η2, where η is the melt viscosity at a measurement temperature of 220 ° C. and a shear rate of 10 sec ^-1 0.45?? 1 /? 2? 0.95,
Wherein the melt viscosity adjusting agent (B) is a polyether derivative represented by the following general formula (1), and the polyether derivative has a weight average molecular weight of 1000 to 4000.
In general formula (1):

(Wherein R and R 'are each independently a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, X is an alkylene group having 2 or 3 carbon atoms, Y is a branched alkylene group having 3 to 5 carbon atoms, Each independently represents an integer of 3 to 60, and m + n represents an integer of 8 to 90) The polyether derivative according to claim 1, wherein the polyether derivative represented by the general formula (1) is a polyether derivative represented by the following general formula (3), wherein the polyether derivative has a weight average molecular weight of 1000 to 4000, Borate resin composition.
The general formula (3)

(Wherein m and n each independently represent an integer of 3 to 60, and m + n represents an integer of 8 to 90) The polyether derivative according to claim 1, wherein the polyether derivative represented by the general formula (1) is a polyether derivative represented by the following general formula (4), wherein the polyether derivative has a weight average molecular weight of 1000 to 4000, Borate resin composition.
In general formula (4):

(Wherein m and n each independently represent an integer of 3 to 60, and m + n represents an integer of 8 to 90) The polycarbonate resin composition according to claim 1, wherein the phosphorous acid ester compound (C) is at least one compound selected from the compounds represented by the following general formulas (5), (6) and (7).
The general formula (5)

(Wherein R ¹ represents an aryl group which may be substituted with an alkyl group having 1 to 20 carbon atoms or an alkyl group, and a represents an integer of 0 to 3)
In general formula (6):

(Wherein R ² , R ³ , R ⁵ and R ⁶ are each independently a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkylcycloalkyl group having 6 to 12 carbon atoms, R ⁴ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, X represents a single bond, a sulfur atom or a group represented by the formula: -CHR ⁷ - (wherein R ⁷ represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms An alkyl group or a cycloalkyl group having 5 to 8 carbon atoms, A represents an alkylene group having 1 to 8 carbon atoms or a group represented by the formula: -COR ⁸ - (wherein R ⁸ is a single bond or an alkyl having 1 to 8 carbon atoms Y represents a hydroxyl group, an alkoxy group of 1 to 8 carbon atoms, or an aralkyloxy group of 7 to 12 carbon atoms, and Y represents a hydrogen atom or an alkyl group of 1 to 8 carbon atoms, On the other hand, Or an alkyl group having 1 to 8 carbon atoms)
(7): < EMI ID =

(Wherein R ⁹ and R ¹⁰ represent an alkyl group having 1 to 20 carbon atoms or an aryl group optionally substituted with an alkyl group, and b and c represent an integer of 0 to 3) The polycarbonate resin composition according to claim 4, wherein the compound represented by the general formula (5) is tris (2,4-di-t-butylphenyl) phosphite. 5. The compound according to claim 4, wherein the compound represented by the general formula (6) is 2,4,8,10-tetra-t-butyl-6- [3- (3- -Butylphenyl) propoxy] dibenzo [d, f] [1,3,2] dioxaphospepine. 5. The compound according to claim 4, wherein the compound represented by the general formula (7) is 3,9-bis (2,6-di-tert- Oxa-3,9-diphosphaspiro [5,5] undecane. A molded article for optical use comprising the polycarbonate resin composition according to any one of claims 1 to 7. The optical molded article according to claim 8, wherein the molded article is a light guide plate.