JP2003119359A - Polytrimethylene terephthalate resin composition excellent in weather resistance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polytrimethylene terephthalate resin composition having a good molding property, a small warp distortion, a good appearance and a stiffness under a high temperature of its molded product, and in addition, having an excellent weather resistance. SOLUTION: This resin composition consisting of the polytrimethylene terephthalate with an ultraviolet light-absorbing agent is characterized by containing (B) 0.01-5 pts.wt. ultraviolet light-absorbing agent based on (A) 100 pts.wt. polytrimethylene terephthalate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polytrimethylene terephthalate resin composition suitably used for parts such as connectors in the electric and electronic fields, electrical parts such as connectors in the field of automobiles, and other useful parts materials. In particular, the present invention relates to a polytrimethylene terephthalate resin composition having good moldability, small warpage and deformation of the molded product, good appearance of the molded product, high rigidity at high temperature, and excellent weather resistance.

[0002]

2. Description of the Related Art Thermoplastic polyesters typified by polyethylene terephthalate and polybutylene terephthalate have excellent mechanical properties, chemical resistance and electrical properties, and are expected to be used in a wide range of fields such as automobile parts and electric / electronic parts. Has been done. With the diversification of the market, high performance, special performance according to application, and high quality are required.

For example, automobile parts for outdoor use, electricity,
In the case of electronic parts, there is a demand for even higher weather resistance, and there has been an urgent need to meet the demand. In this situation, polyethylene terephthalate and polybutylene terephthalate have been examined for their corresponding technologies, but they are not satisfactory. In the case of polyethylene terephthalate, there is a problem before imparting weather resistance, such as deformation of the molded product at the time of mold release in normal molding such as injection molding, and the resulting molded product can not realize the original mechanical properties. I can't answer.

On the other hand, in the case of polybutylene terephthalate,
JP-A-7-216206 and JP-A-8-12006
Although the publication No. 6 describes that the weather resistance is improved to some extent by the technology of imparting weather resistance, the warp deformation of the molded product is large, the external appearance of the molded product is poor, and the rigidity at high temperature is not sufficient, and the market demand is met. I can't be satisfied.

[0005]

SUMMARY OF THE INVENTION Mechanical properties, chemical resistance,
In addition to electrical characteristics, moldability is good, warpage deformation of the molded product is small, the appearance of the molded product is good, the rigidity at high temperature is high, and in addition, it has weather resistance, and provides a molded product material that fully satisfies the market demand This is the subject of the present invention.

[0006]

The present inventors have arrived at the present invention as a result of extensive studies to solve the above problems. That is, the present invention is as follows. A resin composition comprising polytrimethylene terephthalate and an ultraviolet absorber,
(A) 0.01 to 5 parts by weight of the ultraviolet absorber (B) per 100 parts by weight of polytrimethylene terephthalate; The component (A), polytrimethylene terephthalate, has a number average molecular weight of 5,000 to 100,000, a molecular weight distribution (Mw / Mn) of 1.2 to 4.5, and a molecular weight of 100,000 or more. Is a polytrimethylene terephthalate containing 1 to 20% of

3. The ultraviolet absorber which is the component (B) is a benzotriazole compound, a benzophenone compound,
3. The resin composition as described in 1 or 2 above, which is at least one compound selected from hindered amine compounds and triazine compounds. As the component (C), a crystal nucleating agent is further added in an amount of 0.001 to 5 with respect to 100 parts by weight of polytrimethylene terephthalate.
The resin composition according to any one of 1 to 3 above, which is blended in parts by weight.

The inventors of the present invention, as a result of investigations to solve the problem, consist of polytrimethylene terephthalate and at least one compound selected from benzotriazole compounds, benzophenone compounds, hindered amine compounds and triazine compounds. The composition has characteristics different from a composition comprising polyethylene terephthalate and polybutylene terephthalate and at least one compound selected from benzotriazole compounds, benzophenone compounds, hindered amine compounds and triazine compounds. Found.

Further, it has been found that there is a specific value in the effective compounding amount of at least one compound selected from the group consisting of benzotriazole compounds, benzophenone compounds, hindered amine compounds and triazine compounds to be added to polytrimethylene terephthalate. It was The present invention is a resin composition comprising polytrimethylene terephthalate and an ultraviolet absorber, and the effects of the present invention are obtained by the compatibility of polytrimethylene terephthalate with a specific amount of the ultraviolet absorber and the component composition of the present invention. I was able to.

The present invention will be specifically described below.
First, polytrimethylene terephthalate as the component (A) of the composition of the present invention will be described. In the present invention, polytrimethylene terephthalate (hereinafter sometimes abbreviated as “PTT”) represents a polyester polymer using terephthalic acid as an acid component and trimethylene glycol as a glycol component. In the present invention, trimethylene glycol is selected from 1,3-propanediol, 1,2-propanediol, 1,1-propanediol, 2,2-propanediol, or a mixture thereof, which is stable. From the perspective of 1,
3-Propanediol is particularly preferred.

In addition to the above, an aromatic dicarboxylic acid other than terephthalic acid, such as phthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenyl ether, is used as an acid component within a range that does not impair the object of the present invention. Dicarboxylic acid, diphenoxyethanedicarboxylic acid, diphenylmethanedicarboxylic acid, diphenylketone dicarboxylic acid, diphenylsulfonedicarboxylic acid, etc .; aliphatic dicarboxylic acid such as succinic acid, adipic acid, sebacic acid; alicyclic dicarboxylic acid such as cyclohexanedicarboxylic acid; Using oxydicarboxylic acids such as ε-oxycaproic acid, hydroxybenzoic acid, and hydroxyethoxybenzoic acid, ethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene as the glycol component. Recall, octamethylene glycol, neopentyl glycol, cyclohexanedimethanol, xylylene glycol, diethylene glycol, polyoxyalkylene glycol, may be copolymerized with such a part hydroquinone.

The amount of the copolymerization in the case of copolymerization is not particularly limited as long as the object of the present invention is not impaired, but is usually 20 mol% or less of the acid component or 2 of the glycol component.
It is preferably 0 mol% or less. Further, PTT may be a combination of two or more of these copolymerization components. Further, a branched component in the above polyester component, for example, tricarballylic acid, trimesic acid, trimellitic acid and the like, an acid having a trifunctional or tetrafunctional ester forming ability,
Alternatively, a trifunctional or tetrafunctional ester-forming alcohol such as glycerin, trimethylolpropane, or pentaerythritol may be copolymerized, in which case they are 1.0 mol% or less of the total dicarboxylic acid component, It is preferably 0.5 mol% or less, and more preferably 0.3 mol% or less.

The PTT of the present invention preferably has a number average molecular weight of 5,000 to 100,000,
It is more preferably 7,000 to 100,000, Mw / Mn showing a molecular weight distribution is preferably 1.2 to 4.5, and more preferably 1.5 to 4.5. Furthermore, it is preferable that 1 to 20% of molecules having a molecular weight of 100,000 or more are contained.

If the number average molecular weight is less than 5,000, the mechanical strength may decrease, and if it exceeds 100,000, the fluidity may become a problem. Also, Mw /
If Mn deviates from the range of 1.2 to 4.5, the balance between moldability and mechanical properties may deteriorate. Particularly important is the content of molecules with a molecular weight of 100,000 or more,
If it is less than 1%, there is a concern that the mechanical strength will be reduced particularly under high temperature and high humidity. When it is 20% or more, the moldability is lowered and the molding time may be prolonged.

The method for producing PTT used in the present invention is as follows:
Although not particularly limited, for example, JP-A-51-
140992, JP-A-5-262862,
According to the method described in JP-A-8-311177, terephthalic acid or its ester-forming derivative (for example, lower alkyl ester such as dimethyl ester or monomethyl ester) and trimethylene glycol or its ester-forming derivative, In the presence of a catalyst, the mixture is heated and reacted at a suitable temperature and for a time, and the glycol ester of terephthalic acid obtained is further reacted in the presence of a catalyst at a suitable temperature and
A method of conducting a polycondensation reaction to a desired degree of polymerization in time can be mentioned.

The number average molecular weight and the molecular weight distribution can be measured by, for example, an osmotic pressure method, a terminal quantification method or a GPC method (gel permeation chromatography). For example, Tohso Co., Ltd. HLC-8120, Showa Denko KK HFIP804-803 (two 30 cm columns) as a column, hexafluoroisopropanol (hereinafter referred to as HFIP) as a carrier, and Polymer Laboratory PMMA as a standard sample. Using a temperature of 40
It can be carried out at a temperature of 0.5 ° C. and a flow rate of 0.5 ml / min.

Examples of the ultraviolet absorber as the component (B) of the composition of the present invention include benzotriazole compounds, benzophenone compounds, hindered amine compounds, triazine compounds, benzoate compounds, and the like. One type or two or more types are used. A particularly preferable ultraviolet absorber is at least one compound selected from benzotriazole compounds, benzophenone compounds, hindered amine compounds and triazine compounds. The details will be described below.

The preferred benzotriazole compounds used in the present invention include, for example, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole; 2-
(2'-Hydroxy-3'-5'-di-t-butylphenyl) benzotriazole; 2- (2'-hydroxy-
3'-5'-di-t-butylphenyl) -5-chlorobenzotriazole; 2- (2'-hydroxy-3 ',
5'-diphenyl) -5-benzotriazole; 2-
(2'-Hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole; 2-
(2'-hydroxy-5'-t-butyl-5'-methylphenyl) benzotriazole; 2- (2'-hydroxy-3'-s-butyl-5'-t-butylphenyl) benzotriazole; 2- (2'-hydroxy-5-t-
Octylphenyl) benzotriazole; 2- (2H-
Benzotriazol-2-yl) -4,6-bis (1-
Methyl-1-phenylethyl) -phenol; and 2-
A benzotriazole selected from the group consisting of (3 ', 5'-bis (1-methyl-1-phenylethyl) -2'-hydroxyphenyl) benzotriazole.
Among them, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole and 2- (2H-benzotriazol-2-yl) -4,6-bis (1-methyl-1-phenylethyl) -phenol are particularly preferable. preferable.

Preferred benzophenone compounds used in the present invention include, for example, 2,4-dihydroxybenzophenone; 2-hydroxy-4-methoxybenzophenone; 2-hydroxy-4-t-butoxybenzophenone; 2-hydroxy-4-. Octoxybenzophenone;
2-hydroxy-4-dodecyloxybenzophenone;
2-hydroxy-4-stearoxybenzophenone; 2
-Hydroxy-4-phenoxybenzophenone; 2-hydroxy-4- (β-hydroxyethoxy) benzophenone; 2-hydroxy-4- (2'-hydroxy-3 '
-Acryloxypropoxy) benzophenone; 2-hydroxy-4- (2'-hydroxy-3'-methacryloxypropoxyl) benzophenone; 2,2'-dihydroxybenzophenone;2,2'-dihydroxy-4
-Methoxybenzophenone; 2,2'-dihydroxy-
4-butoxyobenzophenone; 2,2'-dihydroxy-4-octoxybenzophenone;2,2'-dihydroxy-4-lauroxybenzophenone; 2,2 ',
4,4'-Tetrahydroxybenzophenone; 2,
2 ', 4'-Trihydro-4-methoxybenzophenone;2-hydroxy-4-methoxy-4'-chlorobenzophenone;2,2'-dihydroxy-4,4'-dimethyloxybenzophenone; 2-hydroxy-4-methoxy -2'-methyl-4'-hydroxybenzophenone;2-hydroxy-4-methoxy-4'-t-butylbenzophenone; 2-hydroxy-4-methoxy-4 '
-Methyl-benzophenone; 2-hydroxy-4,4 '
-Dimethoxybenzophenone; 2-hydroxy-4,
Benzophenone selected from the group consisting of 4 ', 2'-trimethoxybenzophenone; and 2-hydroxy-4-N-octoxybenzophenone. 2,4-
Dihydroxybenzophenone and 2-hydroxy-4-octoxybenzophenone are particularly preferable.

The preferred hindered amine compound used in the present invention is, for example, 4-acetoxy-2,2,2.
6,6-Tetramethylpiperidine, 4-stearoyloxy-2,2,6,6-tetramethylpiperidine, 4-
Acryloyloxy-2,2,6,6-tetramethylpiperidine, 4- (phenylacetoxy) -2,2,6
6-tetramethylpiperidine, 4-benzoyloxy-
2,2,6,6-tetramethylpiperidine, 4-methoxy-2,2,6,6-tetramethylpiperidine, 4-stearyloxy-2,2,6,6-tetramethylpiperidine, 4-cyclohexyloxy- 2,2,6,6-tetramethylpiperidine, 4-benzyloxy-2,2
6,6-Tetramethylpiperidine, 4-phenoxy-
2,2,6,6-tetramethylpiperidine, 4- (ethylcarbamoyloxy) -2,2,6,6-tetramethylpiperidine, 4- (cyclohexylcarbamoyloxy) -2,2,6,6-tetramethyl Piperidine, 4-
(Phenylcarbamoyloxy) -2,2,6,6-tetramethylpiperidine, bis (2,2,6,6-tetramethyl-4-piperidyl) -carbonate, bis (2,2
2,6,6-Tetramethyl-4-piperidyl) -oxalate, bis (2,2,6,6-tetramethyl-4-piperidyl) -malonate, bis (2,2,6,6-tetramethyl-4) -Piperidyl) -sebacate, bis (2,
2,6,6-Tetramethyl-4-piperidyl) -adipate, bis (2,2,6,6-tetramethyl-4-piperidyl) -terephthalate, 1,2-bis (2,2,2)
6,6-Tetramethyl-4-piperidyloxy) -ethane, α, α′-bis (2,2,6,6-tetramethyl-
4-piperidyloxy) -p-xylene, bis (2,2
2,6,6-tetramethyl-4-piperidyl tolylene-
2,4-dicarbamate, bis (2,2,6,6-tetramethyl-4-piperidyl) -hexamethylene-1,6
-Dicarbamate, tris (2,2,6,6-tetramethyl-4-piperidyl) -benzene-1,3,5-tricarboxylate, tris (2,2,6,6-tetramethyl-4-piperidyl) ) -Benzene-1,3,4-tricarboxylate, 1- [2- {3- (3,5-di-t
-Butyl-4-hydroxyphenyl) propionyloxy} butyl] -4- [3- (3,5-di-t-butyl-
4-hydroxyphenyl) propionyloxy] 2,
2,6,6-tetramethylpiperidine, 1,2,3,4
-Butane tetracarboxylic acid and 1,2,2,6,6-pentamethyl-4-piperidinol and β, β, β ', β'-
Examples thereof include a condensate with tetramethyl-3,9- [2,4,8,10-tetraoxaspiro (5,5) undecane] diethanol, and the like, or a mixture thereof. Among them, 4-acetoxy-2,2,6,6-tetramethylpiperidine and bis (2,2,6,6-tetramethyl-4-piperidyl) -sebacate are particularly preferable.

The preferred triazine compound used in the present invention is, for example, 2,4,6-tris (2-hydroxy-4-octyloxy-phenyl) -1,3,5-.
Triazine, 2- (2-hydroxy-4-hexyloxy-phenyl) -1,3,5-triazine, 2- (2-
Hydroxy-4-octyloxy-phenyl) -4,6
-Bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- (2,4-dihydroxyphenyl)-
4,6-bis (2,4-dimethylphenyl) -1,3,
5-triazine, 2,4-bis (2-hydroxy-4-)
Propyloxy-phenyl) -6- (2,4-dimethylphenyl) -1,3,5-triazine, 2- (2-hydroxy-4-octyloxy-phenyl) -4,6-bis (4-methylphenyl) ) -1,3,5-triazine,
2- (2-hydroxy-4-dodecyloxy-phenyl) -4,6-bis (2,4-dimethylphenyl)-
1,3,5-triazine, 2,4,6-tris (2'-
Hydroxy-4'-isopropyloxyphenyl)-
1,3,5-triazine, 2,4,6-tris (2'-
Hydroxy-4'-n-hexyloxyphenyl)-
1,3,5-triazine, 2,4,6-tris (2'-hydroxy-4'-ethoxycarbonylmethoxyphenyl) -1,3,5-triazine and the like can be mentioned. Among them, 2- (2-hydroxy-4-hexyloxy-phenyl) -1,3,5-triazine is preferable.

The amount of the ultraviolet absorber added is preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the obtained polytrimethylene terephthalate. More preferably, 0.03 to 3 parts by weight, most preferably 0.05 to
It is 1.0 part by weight. If it is less than 0.01 parts by weight, the effect of the present invention cannot be sufficiently exhibited, and if it exceeds 5 parts by weight, the excellent mechanical properties originally possessed by the polytrimethylene terephthalate resin are impaired, which is not preferable. Further, the composition of the present invention may be used in combination with various additives which are usually used within the range not impairing the object of the present invention. Examples of the additives include antioxidants, crystal nucleating agents, moldability improvers and mold release agents, plasticizers, and colorants.

Crystal nucleus as component (C) of the composition of the present invention
If the agent is further blended, the composition more suited to the object of the present invention is obtained.
A product is obtained. As the crystal nucleating agent (C), organic substances,
Any item can be used. As an inorganic substance,
Zn powder, Al powder, graphite, carbon black
Such as simple substance, ZnO 2, MgO 2, Al_TwoO_Three , Ti
O_Two, MnO_Two, SiO_Two, Fe_ThreeO_Four Metal acids such as
Compound, aluminum nitride, silicon nitride, titanium nitride, boron
Nitride such as trid, Na_TwoCO_Three, CaCO_Three ,
MgCO_Three , CaSO_Four , CaSiO_Three, BaSO_Four
 , Ca_Three(PO _Four)_Three Inorganic salts such as, talc, kaori
Clays such as clay, clay and clay are used alone or in combination of two or more.
Can be used. Also, as organic matter,
Calcium oxalate, sodium oxalate, calci benzoate
Um, calcium phthalate, calcium tartrate, steer
Organic salts such as magnesium phosphate and polyacrylate
Of polyester, polyethylene, polypropylene, etc.
Polymers, cross-linked polymers, etc. may be used alone or in combination of two or more.
Can be used. Especially preferred is Boronna
Itride, talc, kaolin, clay, clay, etc.
Of clay. Regarding the amount of addition of these crystal nucleating agents (C)
Is 0.001 to 5 parts by weight with respect to 100 parts by weight of PTT
However, the amount of addition of 0.01 to 3 parts by weight is a mechanical property.
Is particularly preferable in.

By further adding a moldability improver to the composition of the present invention, a resin composition more suitable for the purpose of the present invention can be obtained. Moldability improvers include phosphoric acid esters, phosphite esters, higher fatty acids, higher fatty acid metal salts, higher fatty acid esters, higher fatty acid amide compounds, polyalkylene glycol or terminal modified products thereof, low molecular weight Examples thereof include polyethylene or low-molecular-weight polyethylene oxides, substituted benzylidene sorbitols, polysiloxanes, and caprolactones. Particularly preferred are (a) higher fatty acids, (b) higher fatty acid metal salts, and (c) higher fatty acid esters. It is a kind. These moldability improvers will be described in detail below.

(A) Higher fatty acids As higher fatty acids, higher saturated fatty acids, higher unsaturated fatty acids or mixtures thereof are preferably used. (A-1) Higher saturated fatty acids Higher saturated fatty acids include, for example, capric acid, uradecyl acid, lauric acid, tridecylic acid, myristic acid, pentadecyl acid, palmitic acid, heptadecyl acid, stearic acid, nonadecanoic acid, arachidic acid, Examples thereof include behenic acid, lignoceric acid, cerotic acid, heptacosanoic acid, montanic acid, melissic acid, laxeric acid, and the like, or a mixture thereof.

(A-2) Higher unsaturated fatty acids As the higher unsaturated fatty acids, unsaturated fatty acids having 6 to 22 carbon atoms are preferably used. Among them, more preferable ones are, for example, undecylenic acid and oleic acid. , Elaidic acid, cetoleic acid, erucic acid, brassic acid, sorbic acid, linoleic acid, linolenic acid, arachidonic acid, stearolic acid, 2-hexadecenoic acid, 7-hexadecenoic acid, 9-hexadecenoic acid, gadoleic acid, gadoelaidic acid, 11-eicosenoic acid and the like, or a mixture thereof can be mentioned.

(B) Higher fatty acid metal salts As the higher fatty acid metal salts, higher saturated fatty acid metal salts, higher unsaturated fatty acid metal salts or mixtures thereof are preferably used. (B-1) Higher saturated fatty acid metal salt The higher saturated fatty acid fatty acid is represented by the following general formula. _{CH 3 (CH 2) n COO} (M) where a n = 8 to 30, the metal element (M) is, 1A of the Periodic Table of the Elements, 2A, 3A group elements, zinc, and aluminum are preferably used . Among them, more preferred are, for example, capric acid, uradecyl acid, lauric acid, tridecyl acid, myristic acid, pentadecyl acid,
Palmitic acid, heptadecyl acid, stearic acid, nonadecanoic acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, heptacosanoic acid, montanic acid, melissic acid, laccelic acid lithium salt, sodium salt, magnesium salt, calcium salt, zinc salt , Aluminum salts, etc., or a mixture thereof.

(B-2) Higher unsaturated fatty acid metal salt The higher unsaturated fatty acid metal salt has 6 to 22 carbon atoms.
Unsaturated fatty acids and metal salts of 1A, 2A and 3A elements of the periodic table of elements, zinc, aluminum and the like are preferably used, and among them, undecylenic acid, oleic acid, elaidic acid, cetrain are more preferable. Acid, erucic acid, brassic acid, sorbic acid, linoleic acid, linolenic acid, arachidonic acid, stearolic acid, 2-hexadecenoic acid, 7-hexadecenoic acid, 9-hexadecenoic acid, gadoleic acid, gadoelaidic acid, 11-eicosenoic acid Examples thereof include lithium salt, sodium salt, magnesium salt, calcium salt, zinc salt, aluminum salt, and the like, or a mixture thereof.

(C) Higher fatty acid ester As the higher fatty acid ester in the present invention, an ester of a higher alcohol and a higher fatty acid, an ester of a polyhydric alcohol and a higher fatty acid, or a mixture thereof is preferably used.

(C-1) Esters of higher alcohols and higher fatty acids As esters of higher alcohols and higher fatty acids, preferred are aliphatic alcohols having 8 or more carbon atoms and higher fatty acids having 8 or more carbon atoms. Esters. Preferred higher fatty acid esters include, for example, lauryl laurate, lauryl myristate, lauryl palmitate, lauryl stearate, lauryl behenate, lauryl lignocerate, lauryl melicate, myristyl laurate, myristyl myristate, myristyl stearate. , Myristyl behenate, myristyl lignocerate, myristyl melissate, palmityl laurate, palmityl myristate, palmityl stearate, palmityl behenate, palmityl lignocerate, palmityl melicate, stearyl laurate , Stearyl myristate, stearyl palmitate, stearyl stearate, stearyl behenate, stearyl arachinate, stearyl lignocerate, stearyl melissate, eye Shiruraureto, Aiko sill palmitate,
Aicosyl stearate, aicosyl behenate, aicosyl lignocerate, aicosyl melissate, behenyl laurate, behenyl myristate, behenyl palmitate, behenyl stearate, behenyl behenate,
Behenyl arachinate, behenyl melissate, tetracosanyl laurate, tetracosa palmitate, tetracosanyl stearate, tetracosanyl behenate, tetracosanyl lignocerate, tetracosanyl serrate, cerotinyl stearate. , Cerotinyl behenate,
Mention may be made of cerotinyl serotinate, melisyl laurate, melisyl stearate, melisyl behenate, melisyl merisate and the like, or mixtures thereof.

(C-2) Esters of Polyhydric Alcohol and Higher Fatty Acids Partial esters of polyhydric alcohols and higher fatty acids include polyhydric alcohols such as glycerin, 1,2,3-butanetriol, 1,2. , 3-pentanetriol, erythritol, pentaerythritol, trimethylolpropane, mannitol, sorbitol and the like are preferably used, and higher fatty acids include, for example, capric acid, uradecyl acid, lauric acid, tridecyl acid, myristic acid, pentadecyl acid, Palmitic acid, heptadecyl acid,
Stearic acid, nonadecanoic acid, arachidic acid, behenic acid,
Lignoceric acid, serotic acid, heptacosanoic acid, montanic acid, melissic acid, laxeric acid and the like are preferably used.

The esters of these polyhydric alcohols and higher fatty acids may be monoesters, diesters or triesters. More preferred are higher fatty acid monoglycerides such as glycerin monolaurate, glycerin monomyristate, glycerin monostearate, glycerin monobehenate, glycerin monolignocellate, glycerin monomerisate, pentaerythritol-mono or di-. Laurate, pentaerythritol-mono or di-
Laurate, pentaerythritol-mono or di-myristate, pentaerythritol-mono or di-palmitate, pentaerythritol-mono or di-stearate, pentaerythritol-mono or di-behenate, pentaerythritol-mono or di-lignocerate, penta Erythritol-mono or di-merisate pentaerythritol mono- or di-higher fatty acid esters, trimethylolpropane-mono- or di-laurate, trimethylolpropane-mono-
Or di-myristate, trimethylolpropane-mono- or di-palmitate, trimethylolpropane-mono- or di-stearate, trimethylolpropane-mono- or di-behenate, trimethylolpropane-mono- or di-lignocerate , Trimethylolpropane-mono- or di-merisate, such as trimethylolpropane mono- or di-higher fatty acid esters, sorbitan-mono, di- or tri-laurate,
Sorbitan-mono, di- or tri-myristate, sorbitan-mono, di- or tri-stearate, sorbitan-mono, di- or tri-behenate, sorbitan-mono, di- or tri-lignocerate, sorbitan-mono, di- or tri- Sorbitan such as melissate-mono-, di- or tri-higher fatty acid ester, mannitan-
Mono, di or tri-laurate, mannitan-mono,
Di- or tri-myristate, mannitan-mono, di- or tri-palmitate, mannitan-mono, di- or tri-stearate, mannitan-mono, di- or tri-behenate, mannitan-mono, di- or tri-lignocerate, mannitan- Mentione-mono-, di- or tri-higher fatty acid esters such as mono-, di- or tri-mericerate, etc., or mixtures thereof may be mentioned.

The compounding amount of these (a) higher fatty acids, (b) higher fatty acid metal salts, and (c) higher fatty acid esters is 0.001 with respect to 100 parts by weight of PTT in the PTT resin composition of the present invention. It is preferably from 5 to 5 parts by weight, more preferably from 0.01 to 3 parts by weight. When the compounding amount of the moldability improver is less than 0.001 part by weight, the moldability is not improved until the object of the present invention is achieved, and when it exceeds 5 parts by weight. However, it is not preferable because it tends to generate silver on the surface of the molded product and deteriorates the mechanical properties of the molded product.

Further, in the composition of the present invention, various fillers which are usually used can be used within the range not impairing the purpose of the present invention. Examples of the type of filler include inorganic fillers such as glass fiber and carbon fiber. Further, in the composition of the present invention, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polystyrene resin (rubber reinforced polystyrene, acrylonitrile-butadiene-styrene resin, etc.) is added to the composition of the present invention within the range not impairing the object of the present invention. 1) or 2 or more types of the thermoplastic resin of 1) may be mixed.

The method for producing the composition of the present invention is not particularly limited, and a polyester containing trimethylene terephthalate as a main repeating unit and an ultraviolet absorber are melt-mixed by a uniaxial or biaxial extruder, a roll or a Banbury mixer. Method, polyester having trimethylene terephthalate as the main repeating unit and a UV absorber are melt-mixed to prepare a masterbatch, and then mixed with polyester having trimethylene terephthalate as the main repeating unit so that the UV absorber has a predetermined amount. How to do, etc. are used. The masterbatch method is more effective in the composition of the present invention.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The properties described in Examples and Comparative Examples were evaluated by the following methods.

(Evaluation method) (1) [Surface gloss] IS150E manufactured by Toshiba Machine Co., Ltd.
Using an injection molding machine, the cylinder temperature is 290 ° C., the mold temperature is 90 ° C. and 120 ° C., and the injection pressure and speed are appropriately adjusted so that the filling time is about 1.5 seconds.
A 90 × 3 mm injection molded plate was obtained. Using this flat plate, a gloss meter (IG320 made by HORIBA) is used and JIS-K
60 degree gloss was measured according to 7150. [Color difference (ΔE)] The color difference was measured using a color difference meter ND-300A manufactured by Nippon Denshoku Co., Ltd. [Weather resistance] An injection-molded plate obtained at a mold temperature of 120 ° C was subjected to a xenon arc type accelerated weathering tester (XENOTEST 1200CPS manufactured by Atlas Co.) in the same manner as used for the evaluation of surface gloss.
Black panel temperature of 83 ° C. was used for 12 hours for 1 hour for water spraying for 300 hours for evaluation. The surface glossiness and the color tone before and after the exposure were measured, and the gloss retention rate and the color difference were obtained, respectively. The measuring method is as described above. The gloss retention is expressed as a percentage of the gloss after the exposure to the gloss before the exposure. It can be judged that the higher the retention is and the smaller the color difference (ΔE) is, the better the weather resistance is.

(2) Warp Deformability: Deflection (mm) A flat plate injection-molded using a mold having a thickness of 3 mm and a side of 130 mm was placed on a horizontal plane, and the maximum gap distance from the horizontal plane was measured. (3) Appearance of molded body: Handy gloss meter IG32 manufactured by Horiba
0 was used to measure Gs 60 ° C. according to JIS-K7150. When the numerical value was 70 or more, it was evaluated as ◯, and when it was less than 70, it was evaluated as x.

Materials used in Examples and Comparative Examples are described below. (1) PTT: polytrimethylene terephthalate. Polytrimethylene terephthalate having an intrinsic viscosity [η] of 1.01 × 10 ² cm ³ · g ^-1 . The intrinsic viscosity [η] was calculated based on the following defining equation. [Η] = lim (1 / C) × (ηr−1) [C → 0] ηr in the defining formula is 35 ° C. of a dilute solution of polytrimethylene terephthalate dissolved in o-chlorophenol having a purity of 98% or more. Relative viscosity is defined as the value obtained by dividing the viscosity of the above-mentioned by the viscosity of the solvent itself measured at the same temperature. Further, C is a solute weight value in gram unit in 100 ml of the above solution. Number average molecular weight 9800, Mw / M
n = 2.5, occupancy ratio of 100,000 or more molecules is 5.8%
Met.

The molecular weight and molecular weight distribution of polytrimethylene terephthalate were measured by GPC (gel permeation chromatography). The measurement conditions are HLC-8120 manufactured by Tosoh Corporation and HFIP804-803 (30c, Showa Denko KK) as a column.
m column 2), HFIP was used as a carrier, the temperature was 40 ° C., and the flow rate was 0.5 ml / min. A calibration curve was created and measured using PMMA manufactured by Polymer Laboratory as a standard sample. The molecular weight of standard PMMA is 620, 1.
680, 3805, 7611, 13934, 2428
0, 62591, 186000 were used. PBT: Polybutylene terephthalate Polyplastics Co., Ltd. Duranex 2002 PET: Polyethylene terephthalate Polyethylene terephthalate with an intrinsic viscosity of 0.68

(2) UV absorber (a): benzotriazole type UV absorber 2- (2'-hydroxy-5'-methylphenyl) benzotriazole (b): benzophenone type UV absorber 2,4-dihydroxybenzophenone (C): Hindered amine UV absorber 4-acetoxy-2,2,6,6-tetramethylpiperidine (d): Triazine compound 2- (2-hydroxy-4-hexyloxy-phenyl) -1,3 5-Triazine (3) Crystal Nucleating Agent Talc (Nihon Talc Co., Ltd. Microace K-1)

[0042]

[Examples 1 to 8] The materials shown in Table 1 were blended in the required amount in a tumbler type blender, melted and kneaded in an extruder set to a cylinder temperature of 260 ° C, and water-cooled as a strand, which was then melted and kneaded. It cut with the cutter and obtained the pellet prepared below. The extruder has a screw diameter of 25
mm twin-screw extruder (ZSK-25 manufactured by Warner & Frydler Co., Ltd.). The composition pellet thus obtained was molded by an injection molding machine (N-70BII manufactured by Nippon Steel Co., Ltd.) to prepare a molded product. Regarding the evaluation, gloss retention, color difference, warpage and deformability of the molded product, and appearance of the molded product were evaluated according to the above-mentioned method. The results are shown in Table 1.

[0043]

Comparative Examples 1 to 5 Extrusion, granulation, preparation of pellets, and molding were carried out in the same manner as in Example 1 with the formulations shown in Table 1. The results are shown in Table 1. In Comparative Example 4 using a PET: polyethylene terephthalate resin, there was a problem in moldability such as mold release failure at the injection molding stage, and it was not possible to evaluate the physical properties.

[0044]

[Table 1]

[0045]

INDUSTRIAL APPLICABILITY The polytrimethylene terephthalate resin composition containing the ultraviolet absorber of the present invention has good moldability, small warp deformation of the molded product, good appearance of the molded product and high rigidity at high temperature. Has excellent weather resistance.

Claims (4)

[Claims] 1. A resin composition comprising polytrimethylene terephthalate and an ultraviolet absorber, which comprises 100 parts by weight of (A) polytrimethylene terephthalate.
(B) 0.01 to 5 parts by weight of the ultraviolet absorber, a resin composition. 2. The component (A), polytrimethylene terephthalate, has a number average molecular weight of 5,000 to 100,0.
00, molecular weight distribution (Mw / Mn) is 1.2 to 4.5, and 1 to 20% of molecules having a molecular weight of 100,000 or more.
The resin composition according to claim 1, wherein the resin composition is polytrimethylene terephthalate. 3. The ultraviolet absorber as the component (B) is at least one compound selected from benzotriazole compounds, benzophenone compounds, hindered amine compounds, and triazine compounds. The resin composition according to claim 1 or claim 2. 4. As the component (C), a crystal nucleating agent is further added to 100 parts by weight of polytrimethylene terephthalate in an amount of 0.
001-5 parts by weight are blended.
The resin composition according to 2 or 3.