JP2001302926A - Resin composition for molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition for molding having such an improved weatherability as to endure long-time use. SOLUTION: This resin composition, having an improved weatherability, is prepared by compounding 100 pts.wt. thermoplastic resin with 0.001-10 pts.wt. ultraviolet absorber represented by formula (I) (wherein R is an optionally branched 3-17C alkyl) and 0.001-10 pts.wt. at least one hindered amine light stabilizer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for molding and processing having improved weather resistance, and more particularly to an ultraviolet absorber having a specific molecular structure and a hindered amine light stabilizer as a weather resistance imparting agent. And a resin composition for molding.

[0002]

2. Description of the Related Art Olefin resins such as polyethylene and polypropylene, polycarbonate resins, styrene resins such as polystyrene, butadiene styrene, ABS and ACS, polyamide resins such as nylon and polyester resins. Thermoplastic resins represented by polyvinyl chloride, polyphenylene ether, polymethylene methacrylate, and the like are widely used in various fields as various molded articles, fibers, and coating materials. In particular, polyolefin resin should be lightweight,
It is most often used because it is inexpensive.

[0003] However, it is known that a molded article made of only the above-mentioned thermoplastic resin is deteriorated by natural light, particularly ultraviolet rays in natural light, and discoloration and a decrease in mechanical strength are caused, so that it cannot withstand long-term use. I have.

[0004] Therefore, in order to prevent deterioration of the resin for processing a molded article due to light, an ultraviolet absorber or a light stabilizer has been conventionally used alone or in combination. In general, a combination of an ultraviolet absorber and a hindered amine-based light stabilizer has been studied for imparting weather resistance to a resin composition because a synergistic effect can be expected.
9, JP-A-54-66953, JP-A-4-21447
No. 85, JP-A-4-372633, JP-A-10-95
974, and JP-A-11-152404. However, the effects expected of poor compatibility and dispersibility with respect to the resin component are not obtained. In particular, for thermoplastic resins for molding represented by polyolefin, this problem is conspicuous, so it is still sufficiently satisfactory. There has not been proposed a combination of compounds that imparts possible weather resistance.

Accordingly, an object of the present invention is to provide a thermoplastic resin composition for molding which has improved weatherability and can withstand long-term use.

[0006]

Means for Solving the Problems As a result of repeated studies, the present inventors have found that 2,4,6-triaryltriazine having a specific structure can be converted into a thermoplastic resin in combination with a hindered amine light stabilizer. The inventors have found that excellent weather resistance is imparted to them, and have reached the present invention.

The gist of the present invention is as follows. In the first invention, 0.001 to 10 parts by mass of an ultraviolet absorber represented by the following general formula (I) and at least one kind of a hindered amine light stabilizer are added to 100 parts by mass of a thermoplastic resin.
The present invention relates to a molding composition having improved weather resistance, comprising 001 to 10 parts by mass.

Embedded image (In the formula, R represents an alkyl group having 3 to 17 carbon atoms which may be branched.) In the second invention, R of the ultraviolet absorbent represented by the general formula (I) may be branched. The present invention relates to the resin composition for molding and processing according to the first invention, which is an alkyl group having 7 to 17 carbon atoms. The third invention relates to the resin composition for molding processing according to the first or second invention, wherein the thermoplastic resin is a polyolefin-based resin.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail.

In the ultraviolet absorbent represented by the general formula (I) used in the resin composition for molding and processing according to the present invention,
Examples of the alkyl group having 3 to 17 carbon atoms which may be represented by R include propyl, isopropyl, butyl, sec-butyl, tert-butyl, isobutyl, amyl, isoamyl,
Tertiary amyl, hexyl, heptyl, 1-ethylpentyl, isoheptyl, tertiary heptyl, octyl, isooctyl, tertiary octyl, nonyl, isononyl, decyl, undecyl, dodecyl, hexadecyl, heptadecyl, etc. 17 is preferred because it gives the ultraviolet absorber heat resistance and compatibility with the thermoplastic resin, and 1-ethylpentyl and undecyl are more preferred.

If the amount of the ultraviolet absorber is less than 0.001 part by mass with respect to 100 parts by mass of the thermoplastic resin, no effect is obtained, and if it exceeds 10 parts by mass, the effect of addition is improved. Not only because of the high cost,
001 parts by mass to 10 parts by mass.

The hindered amine light stabilizer (hereinafter sometimes referred to as HALS) used in the molding resin composition of the present invention is a 2,2,6,6-tetramethylpiperidine compound. It is. These are N-proton, N-oxyl, N-oxyalkyl,
The 1-position nitrogen such as N-alkyl and N-hydroxy and the functional group bonded thereto captures decomposable radicals derived from the resin generated by ultraviolet rays, light or heat, and oxidized compounds in the resin composition, thereby forming a resin. And a function of imparting weather resistance to the resin composition.

Examples of the above-mentioned HALS include compounds represented by the following general formula (II), cyanuric chloride condensation type, high molecular weight type and the like.

Embedded image (Wherein, n represents an integer of 1 to 6, A is a hydrogen atom,
Represents an n-valent hydrocarbon group having 1 to 18 carbon atoms, an n-valent acyl group or an n-valent carbamoyl group, B represents an oxygen atom,-
NH—, —N having an alkyl group R ′ having 1 to 8 carbon atoms
X represents a hydrogen atom, oxyl (· O), an alkoxy group having 1 to 18 carbon atoms, an alkyl group having 1 to 8 carbon atoms, or a hydroxyl group, and Z represents methine or 1 carbon atom. Represents the following group (III) having up to 8 alkyl groups R ¹ . )

Embedded image

In the above general formula (II), the n-valent hydrocarbon group having 1 to 18 carbon atoms represented by A is methane,
Ethane, propane, butane, second butane, third butane,
Isobutane, pentane, isopentane, tertiary pentane,
Hexane, cyclohexane, heptane, isoheptane,
Tertiary heptane, n-octane, isooctane, tertiary octane, 2-ethylhexane, nonane, isononane, decane, dodecane, tridecane, tetradecane, pentadecane, hexadecane, groups derived from peptadecane, octadecane, benzene, toluene, xylene No.

The n-valent acyl group is a group derived from a carboxylic acid, an n-valent carboxylic acid and a polycarboxylic acid alkyl ester having n remaining carboxyl groups. As the acyl derivative compound, acetic acid, benzoic acid,
4-trifluoromethylbenzoic acid, salicylic acid, acrylic acid, methacrylic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, 2-methylsuccinic acid Acid, 2-methyladipic acid, 3-methyladipic acid, 3-methylpentanedioic acid, 2-methyloctanedioic acid, 3,8-dimethyldecandioic acid, 3,7-dimethyldecandioic acid, hydrogenated dimer acid , Dimer acid, phthalic acid,
Terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, cyclohexanedicarboxylic acid, trimellitic acid, trimesic acid, propane-1,2,3-tricarboxylic acid, propane-1,2,3-tricarboxylic acid mono-dialkyl ester, pentane-1, 3,5-tricarboxylic acid, pentane-1,3,5-tricarboxylic acid mono-dialkyl ester, butane-1,2,3,4-tetracarboxylic acid, butane-1,2,3,4-tetracarboxylic acid mono ~
Trialkyl ester, pentane-1,2,3,4,5
-Pentacarboxylic acid, pentane-1,2,3,4,5-
Pentacarboxylic acid mono-tetraalkyl ester, hexane-1,2,3,4,5,6-hexacarboxylic acid, hexane-1,2,3,4,5,6-hexacarboxylic acid mono-pentaalkyl ester, etc. Is mentioned. The n-valent carbamoyl group is a monoalkyl carbamoyl group or a dialkyl carbamoyl group derived from an isocyanate compound. Examples of the isocyanate compound from which the monoalkyl carbamoyl group is derived include tolylene diisocyanate, diphenylmethane-4,4′-diisocyanate. , P-phenylene diisocyanate, xylylene diisocyanate, 1,5-naphthylene diisocyanate, 3,3'-dimethyldiphenyl-4,4'-diisocyanate, dianisidine diisocyanate, tetramethylxylylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4 , 4'-diisocyanate, trans-1,4-cyclohexyl diisocyanate, norbornene diisocyanate, 1,6-
Hexamethylene diisocyanate, 2,2,4 (2,
2,4) -trimethylhexamethylene diisocyanate, lysine diisocyanate, triphenylmethane triisocyanate, 1-methylbenzol-2,4,6-
Examples include triisocyanate and dimethyltriphenylmethanetetraisocyanate. Examples of the dialkylcarbamoyl include diethylcarbamoyl, dibutylcarbamoyl, dihexylcarbamoyl, and dioctylcarbamoyl. The group represented by A is a halogen atom, a hydroxyl group, an alkyl group, an alkoxy group, a nitro group,
It may be substituted with a cyano group or the like.

Examples of the alkyl group having 1 to 8 carbon atoms represented by R 'in B include methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl, isobutyl,
Amyl, isoamyl, tertiary amyl, hexyl, cyclohexyl, heptyl, isoheptyl, tertiary heptyl, 1-
Examples include ethylpentyl, n-octyl, isooctyl, tertiary octyl, and 2-ethylhexyl. Examples of the alkoxy group having 1 to 18 carbon atoms represented by X include methoxy, ethoxy, propoxy, isopropoxy, butoxy, and sec-butyloxy. , Tert-butyloxy, isobutyloxy,
Amyloxy, isoamyloxy, hexyloxy, heptyloxy, octyloxy, 2-ethylhexyloxy, nonyloxy, isononyloxy, decyloxy, dodecyloxy, tridecyloxy, tetradecyloxy, pentadecyloxy, hexadecyloxy, peptadecyloxy And octadecyloxy; the alkyl group having 1 to 8 carbon atoms includes the same groups as R ′; and the alkyl group having 1 to 8 carbon atoms represented by R ¹ in Z includes R ′ And the same groups as mentioned above.

Further specific examples of HALS represented by the above general formula (II) include, for example, 2,2,6,6-tetramethyl-4-piperidyl stearate, 1,2,2,2
6,6-pentamethyl-4-piperidyl stearate,
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) sebacate, bis (1-
Octoxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, tetrakis (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate, Tetrakis (1, 2, 2,
6,6-pentamethyl-4-piperidyl) -1,2,2
3,4-butanetetracarboxylate, bis (2,
2,6,6-tetramethyl-4-piperidyl) bis (tridecyl) -1,2,3,4-butanetetracarboxylate, bis (1,2,2,6,6-pentamethyl-4-piperidyl)・ Bis (tridecyl) -1,2,
3,4-butanetetracarboxylate, bis (1,
2,2,6,6-pentamethyl-4-piperidyl) -2
-Butyl-2- (3,5-ditert-butyl-4-hydroxybenzyl) malonate, 3,9-bis [1,1-dimethyl-2- [tris (2,2,6,6-tetramethyl) -4-piperidyloxycarbonyloxy) butylcarbonyloxy] ethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane, 3,9-bis [1,
1-dimethyl-2- [tris (1,2,2,6,6-pentamethyl-4-piperidyloxycarbonyloxy)
[Butylcarbonyloxy] ethyl] -2,4,8,10
-Tetraoxaspiro [5.5] undecane and the like.

As the cyanuric chloride condensation type HALS,
1,6-bis (2,2,6,6-tetramethyl-4-piperidylamino) hexane / 2,4-dichloro-6-morpholino-s-triazine polycondensate, 1,6-bis (2,2 , 6,6-tetramethyl-4-piperidylamino) hexane / 2,4-dichloro-6-tert-octylamino-s-triazine polycondensate, 1,5,8,12-tetrakis [2,4-bis (N-butyl-N- (2,2,
6,6-tetramethyl-4-piperidyl) amino) -s
-Triazin-6-yl] -1,5,8,12-tetraazadodecane, 1,5,8,12-tetrakis [2,4
-Bis (N-butyl-N- (1,2,2,6,6-pentamethyl-4-piperidyl) amino) -s-triazin-6-yl] -1,5,8,12-tetraazadodecane, 1,6,11-tris [2,4-bis (N-butyl-N- (2,2,6,6-tetramethyl-4-piperidyl) amino) -s-triazin-6-ylamino] undecane, 1 , 6,11-Tris [2,4-bis (N-butyl-N- (1,2,2,6,6-pentamethyl-4-
Piperidyl) amino) -s-triazin-6-ylamino] undecane.

Further, as the high molecular weight HALS, 1-
(2-hydroxyethyl) -2,2,6,6-tetramethyl-4-piperidinol / diethyl succinate polycondensate, 1,6-bis (2,2,6,6-tetramethyl-4
-Piperidylamino) hexane / dibromoethane polycondensate and the like.

The above-mentioned HALS may be used alone or as a mixture of two or more kinds.
If the amount is less than 0.001 part by mass, no effect is obtained. If the amount is more than 10 parts by mass, the effect of addition is not improved, and the cost increases.
It is from 10 parts by mass to 10 parts by mass.

The thermoplastic resin used in the molding resin composition of the present invention includes low-density polyethylene,
Polyolefin resins such as α-olefin polymers such as linear low density polyethylene, high density polyethylene, polypropylene, polybutene-1, poly-3-methylbutene, ethylene / propylene block or random copolymer,
Various polycarbonate and polyethylene terephthalate,
Polyester resin such as polybutylene terephthalate, polyhexamethylene terephthalate, polystyrene, high impact polystyrene (HIPS) resin, acrylonitrile butadiene styrene (ABS) resin, polyethylene chloride acrylonitrile styrene (ACS) resin, styrene acrylonitrile (SAN) resin, acrylonitrile butyl acrylate styrene Styrene-based polymer compounds such as (AAS) resin, butadiene styrene resin, styrene maleic acid resin, styrene maleimide resin, ethylene propylene acrylonitrile styrene (AES) resin, butadiene methyl methacrylate styrene (MBS) resin;
Examples thereof include a polymer alloy of polycarbonate and a styrene-based resin, polyvinyl chloride, and polyvinyl acetate.
Among them, polyolefin resins are particularly preferable because the effects of the present invention are remarkably exhibited.

In order to provide the resin composition for molding and processing of the present invention with further stabilization, additives such as general-purpose phenol-based, sulfur-based, and phosphorus-based antioxidants are added as necessary. Further, an ultraviolet absorber other than the compound represented by the general formula (I) can also be used. Each of these amounts is 0.1 to 100 parts by mass of the resin.
It is preferably from 001 parts by mass to 20 parts by mass.

The above-mentioned phosphorus antioxidants include, for example,
Triphenyl phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tris (2,5-di-tert-butylphenyl) phosphite, tris (nonylphenyl) phosphite, tris (dinonylphenyl) phosphite Phytite, tris (mono- and di-mixed nonylphenyl) phosphite, bis (2-tert-butyl-4,6-dimethylphenyl) .ethyl phosphite, diphenylacid phosphite, 2,2′-methylenebis (4,6- Di-tert-butylphenyl) octylphosphite, diphenyldecylphosphite, phenyldiisodecylphosphite,
Tributyl phosphite, tris (2-ethylhexyl) phosphite, tridecyl phosphite, trilauryl phosphite, dibutyl acid phosphite, dilauryl acid phosphite, trilauryl trithiophosphite, bis (neopentyl glycol) · 1,
4-cyclohexanedimethyldiphosphite, bis (2,
4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,5-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol Diphosphite, distearylpentaerythritol diphosphite, phenyl-4,4'-isopropylidenediphenolpentaerythritol diphosphite, tetra (C12-15 mixed alkyl) -4,4'-
Isopropylidene diphenyl phosphite, bis [2,
2'-methylenebis (4,6-diamylphenyl)] • isopropylidenediphenylphosphite, hydrogenated-4,
4'-isopropylidene diphenol polyphosphite, bis (octylphenyl) bis [4,4'-n-butylidenebis (2-tert-butyl-5-methylphenol)]-1,6-hexanediol diphosphite, Tetratridecyl-4,4'-butylidenebis (2-tert-butyl-5-methylphenol) diphosphite, hexa (tridecyl) -1,1,3-tris (2-methyl-
5-tert-butyl-4-hydroxyphenyl) butane triphosphonite, 9,10-dihydro-9-oxa-
10-phosphaphenanthrene-10-oxide, 2
-Butyl-2-ethylpropanediol 2,4,6-
Tri-tert-butylphenol monophosphite and the like can be mentioned.

Examples of the phenolic antioxidant include:
2,6-di-tert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, stearyl (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, distearyl (3,5 -Di-tert-butyl-
4-hydroxybenzyl) phosphonate, tridecyl
3,5-di-tert-butyl-4-hydroxybenzylthioacetate, thiodiethylenebis [(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 4,
4'-thiobis (6-tert-butyl-m-cresol),
2-octylthio-4,6-di (3,5-ditert-butyl-4-hydroxyphenoxy) -s-triazine, 2,
2'-methylenebis (4-methyl-6-tert-butylphenol), bis [3,3-bis (4-hydroxy-3-
[Tert-butylphenyl) butyric acid] glycol ester, 4,4'-butylidenebis (4,6-di-tert-butylphenol), 2,2'-ethylidenebis (4
6-di-tert-butylphenol), 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, bis [2-tert-butyl-4-methyl-6-
(2-hydroxy-3-tert-butyl-5-methylbenzyl) phenyl] terephthalate, 1,3,5-tris (2,6-dimethyl-3-hydroxy-4-tert-butylbenzyl) isocyanurate, 1, 3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) -2,4 6-trimethylbenzene, 1,3,5-tris [(3,5-ditert-butyl-4-hydroxyphenyl) propionyloxyethyl] isocyanurate, tetrakis [methylene-3]
-(3,5-di-tert-butyl-4-hydroxyphenyl)
Propionate] methane, 2-tert-butyl-4-methyl-6- (2-acryloyl-3-tert-butyl-5-
Methylbenzyl) phenol, 3,9-bis [2- (3
-Tert-butyl-4-hydroxy-5-methylhydrocinnamoyloxy) -1,1-dimethylethyl] -2,
4,8,10-tetraoxaspiro [5.5] undecane, triethylene glycol bis [β- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate] and the like.

Examples of the sulfur-based antioxidant include dialkylthiodipropionates such as dilauryl, dimyristyl, myristylstearyl, distearyl ester of thiodipropionic acid, and pentaerythritol tetra (β-dodecylmercaptopropionate). Β-alkyl mercaptopropionates of the above polyols.

Further, as the ultraviolet absorber, for example,
2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-
2-hydroxybenzophenones such as octoxybenzophenone and 5,5'-methylenebis (2-hydroxy-4-methoxybenzophenone); 2- (2-hydroxy-5-methylphenyl) benzotriazole,
(2-hydroxy-5-tert-octylphenyl) benzotriazole, 2- (2-hydroxy-3,5-ditert-butylphenyl) -5-chlorobenzotriazole,
-(2-hydroxy-3-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, 2- (2-hydroxy-3,5-dicumylphenyl) benzotriazole, 2,2'-methylenebis (4 -Third octyl-6
-Benzotriazolylphenol), polyethylene glycol ester of 2- (2-hydroxy-3-tert-butyl-5-carboxyphenyl) benzotriazole, 2
-[2-hydroxy-3- (2-acryloyloxyethyl) -5-methylphenyl] benzotriazole,
-[2-hydroxy-3- (2-methacryloyloxyethyl) -5-tert-butylphenyl] benzotriazole, 2- [2-hydroxy-3- (2-methacryloyloxyethyl) -5-tert-octylphenyl] Benzotriazole, 2- [2-hydroxy-3- (2-methacryloyloxyethyl) -5-tert-butylphenyl]-
5-chlorobenzotriazole, 2- [2-hydroxy-5- (2-methacryloyloxyethyl) phenyl]
Benzotriazole, 2- [2-hydroxy-3-tert-butyl-5- (2-methacryloyloxyethyl) phenyl] benzotriazole, 2- [2-hydroxy-3
-Tert-amyl-5- (2-methacryloyloxyethyl) phenyl] benzotriazole, 2- [2-hydroxy-3-tert-butyl-5- (3-methacryloyloxypropyl) phenyl] -5-chlorobenzotriazole, 2- [2-hydroxy-4- (2-methacryloyloxymethyl) phenyl] benzotriazole, 2-
[2-hydroxy-4- (3-methacryloyloxy-
2-hydroxypropyl) phenyl] benzotriazole, 2- [2-hydroxy-4- (3-methacryloyloxypropyl) phenyl] benzotriazole, etc.
-(2-hydroxyphenyl) benzotriazoles;
2- (2-hydroxy-4-methoxyphenyl) -4,
6-diphenyl-1,3,5-triazine, 2- (2-
(Hydroxy-4-hexyloxyphenyl) -4,6-diphenyl-1,3,5-triazine, 2- (2-hydroxy-4-octoxyphenyl) -4,6-bis (2
4-dimethylphenyl) -1,3,5-triazine, 2
-[2-hydroxy-4- (3-C12-13 mixed alkoxy-2-hydroxypropoxy) phenyl] -4,
6-bis (2,4-dimethylphenyl) -1,3,5-
Triazine, 2- [2-hydroxy-4- (2-acryloyloxyethoxy) phenyl] -4,6-bis (4
-Methylphenyl) -1,3,5-triazine, 2-
[2-hydroxy-4- (2-acetyloxyethoxy) phenyl] -4,6-bisphenyl-1,3,5-
Triazine, 2- (2,4-dihydroxy-3-allylphenyl) -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy 2- (2-hydroxyphenyl) -4,6-diaryl-1,3,5-triazines such as -3-methyl-4-hexyloxyphenyl) -1,3,5-triazine; phenyl salicylate, resorcinol mono Benzoate, 2,4-ditert-butylphenyl-3,
Benzoates such as 5-di-tert-butyl-4-hydroxybenzoate, hexadecyl-3,5-di-tert-butyl-4-hydroxybenzoate, stearyl (3,5-di-tert-butyl-4-hydroxybenzoate; Ethyl-2'-ethoxyoxanilide, 2-ethoxy-4'-
Substituted oxanilides such as dodecyl oxanilide; cyanoacrylates such as ethyl-α-cyano-β, β-diphenylacrylate, methyl-2-cyano-3-methyl-3- (p-methoxyphenyl) acrylate; Metal salts or metal chelates, particularly salts or chelates of nickel or chromium, are mentioned.

The resin composition of the present invention may further contain, if necessary, a heavy metal deactivator, aluminum p-tert-butylbenzoate, dibenzylidene sorbitol, metal soap, hydrotalcite, a nonionic surfactant, Antistatic agents consisting of cationic surfactants, anionic surfactants, amphoteric surfactants, etc., flame retardants such as halogen-based, phosphorus-based, metal oxides, fluororesins, etc., lubricants such as ethylene bisalkylamide, dyes Well-known additives such as a coloring agent such as a pigment, a nucleating agent, a crystallization agent such as a crystallization accelerator, a processing aid, and a filler can be used.

In the present invention, the method of using the ultraviolet absorbent and HALS represented by the above general formula (I) in a thermoplastic resin is not particularly limited, and the form in which it is added is powder, suspension, or the like. , An emulsion or a solution.

Further, the molded article using the resin composition of the present invention is not particularly limited in the processing method and application, and any of the processing methods and applications usually used can be applied. Examples of the processing method include, for example, calendering, extrusion, injection molding, inflation molding, blow molding, press processing, roll processing, and the like.For example, bumpers, dashboards, resin parts for automobiles such as instrument panels, Resin parts for household appliances such as refrigerators, washing machines, vacuum cleaners, tableware, buckets, household goods such as bathing goods, miscellaneous goods such as toys, molded products such as storage and preservation containers such as tanks, films, sheets, etc. Is mentioned.

[0029]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples. However, the present invention is not limited at all by the following examples.

(Examples 1 to 5) A resin composition obtained by mixing a composition having the following composition with a mixer for 5 minutes was heated at 250 ° C. for 2 minutes.
The pellets obtained by extrusion at 5 rpm were injection molded at 250 ° C. to prepare test pieces having a thickness of 2 mm. About this test piece, using a sunshine weatherometer,
The weather resistance test was performed at a black panel temperature of 83 ° C. and a rain cycle of 18 minutes out of 120 minutes. The evaluation was performed based on the yellowness measured by a Hunter colorimeter 500 hours and 1500 hours after the start of the test and the time until the occurrence of cracks (weather resistance time). The test compound used was Compound 1 shown below,
2 and Comparative Compounds 1 and 2, and the same applies to the following Examples.

[0031]

Embedded image

(Formulation 1) Ethylene-propylene copolymer: 100 parts by mass Calcium stearate: 0.05 parts by mass Stearyl (3,5-di-tert-butyl-4-hydroxyphenyl) propionate: 0.1 parts by mass Tris ( 2,4-di-tert-butylphenyl) phosphite: 0.05 parts by mass HALS (see Tables 1 to 5 below): parts by mass described in Tables 1 to 5 Test compound: 0.3 parts by mass

[0033]

[Table 1]

[0034]

[Table 2]

[0035]

[Table 3]

[0036]

[Table 4]

[0037]

[Table 5]

Example 6 A resin composition obtained by mixing a composition having the following composition with a mixer for 5 minutes was heated at 250 ° C. for 25 minutes.
The pellets obtained by extrusion at pm were injection molded at 250 ° C. to prepare test pieces having a thickness of 2 mm. This test piece was subjected to a weather resistance test using a sunshine weatherometer with a rain cycle of 18 minutes in 120 minutes at a black panel temperature of 83 ° C. Evaluation is 50
After 0 hour, 1500 hours later, the measurement was performed based on the yellowness measured by a Hunter colorimeter and the time until crack generation.

(Formulation 2) Polypropylene: 100 parts by mass Calcium stearate: 0.05 parts by mass Tetrakis [methylene-3- (3,5-di-tert-butyl-)
4-Hydroxyphenyl) propionate] methane:
0.1 parts by mass Tris (2,4-di-tert-butylphenyl) phosphite: 0.1 parts by mass HALS: 3,9-bis [1,1-dimethyl-2- [tris (1,2,2,2) 6,6-pentamethyl-4-piperidyloxycarbonyloxy) butylcarbonyloxy] ethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane: parts by mass described in Table 6 Test compound: 0. 3 parts by mass

[0040]

[Table 6]

Example 7 A resin composition obtained by mixing a composition having the following composition with a mixer for 5 minutes was heated at 250 ° C. for 25 minutes.
The pellets obtained by extrusion at pm were injection molded at 240 ° C. to prepare test pieces having a thickness of 2 mm. This test piece was subjected to a weather resistance test using a sunshine weatherometer with a rain cycle of 18 minutes in 120 minutes at a black panel temperature of 83 ° C. Evaluation is 50
After 0 hour, 1500 hours later, the measurement was performed based on the yellowness measured by a Hunter colorimeter and the time until crack generation. (Blend 3) High-density polyethylene: 100 parts by mass Calcium stearate: 0.05 parts by mass Tetrakis [methylene-3- (3,5-di-tert-butyl-)
4-Hydroxyphenyl) propionate] methane:
0.1 mass parts distearyl thiodipropionate: 0.05 mass parts HALS: bis (2,2,6,6-tetramethyl-4-
Piperidyl) sebacate: parts by mass described in Table 7 Test compound: 0.3 parts by mass

[0042]

[Table 7]

Example 8 100 parts by mass of resin component, HA
LS: tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate 0.3 part by mass, ultraviolet absorber 0.3 described in Table 8 A pellet obtained by extruding the resin composition obtained by mixing the parts by weight of the composition for 5 minutes with a mixer at 25 rpm was injection-molded to prepare a test piece having a thickness of 2 mm. Table 8 shows the processing temperatures of the pellets and test pieces. This test piece was subjected to a weather resistance test using a sunshine weatherometer at a black panel temperature of 83 ° C and without rain. The evaluation was made based on the difference in yellowness between before the start of the test and after 1000 hours using a Hunter colorimeter. The results are shown in Table 8.

[0044]

[Table 8]

[0045]

According to the present invention, it is possible to provide a thermoplastic resin composition for molding which has improved weather resistance and can withstand long-term use.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Saiko Kawaraki 5-2-13-1 Shirahata, Urawa-shi, Saitama Asahi Denka Kogyo Co., Ltd. (72) Keishi Ayabe 5-2-1-13 Shirahata, Urawa-shi, Saitama Asahi Denka Kogyo Co., Ltd. F-term (reference) 4J002 AA011 BB001 BB031 BB121 BB151 EU077 EU186 FD047 FD056

Claims (3)

[Claims] 1. 0.001 to 10 parts by mass of an ultraviolet absorber represented by the following general formula (I) and at least one kind of a hindered amine light stabilizer per 100 parts by mass of a thermoplastic resin. And a resin composition for molding and processing. Embedded image (In the formula, R represents an alkyl group having 3 to 17 carbon atoms which may be branched.) 2. The resin composition according to claim 1, wherein R of the ultraviolet absorbent represented by the general formula (I) is an alkyl group having 7 to 17 carbon atoms which may be branched. 3. The resin composition according to claim 1, wherein the thermoplastic resin is a polyolefin resin.