JP5448466B2 - Polyarylate resin composition and molded article obtained therefrom - Google Patents

Description

  The present invention relates to a polyarylate resin composition excellent in heat resistance, transparency, and color tone.

  Polyarylates composed of dihydric phenols, in particular 2,2-bis (4-hydroxyphenyl) propane, terephthalic acid and / or isophthalic acid are already well known as engineering plastics. Since such polyarylate has high heat resistance, excellent mechanical strength and dimensional stability, and is transparent, the molded product is widely applied to fields such as electric / electronic equipment, automobiles and machines.

  In recent years, improving the fuel efficiency of automobiles has become the biggest challenge in the automobile industry. For this reason, in order to reduce the weight of materials constituting automobiles, attempts have been actively made to apply low specific gravity plastics to automobile parts instead of high specific gravity metals or other inorganic materials. For example, parts such as lamp covers and lenses mounted on automobiles are no exception, and replacement from glass to plastic is progressing.

  Among these types of parts, acrylic resin is used for parts with relatively low requirements for heat distortion, and polycarbonate resin is used for parts with relatively high requirements for heat distortion. However, these acrylic resins and polycarbonates are not sufficient in heat resistance for headlight lenses, inner lenses or fog light lenses, which have higher heat resistance requirements. Under such circumstances, application of polyarylate having high heat resistance has been expected for these parts. However, although the most typical polyarylate composed of 2,2-bis (4-hydroxyphenyl) propane and terephthalic acid and / or isophthalic acid has high heat resistance and transparency, the heat caused by the light source of light mentioned above. As a result, the application has been greatly limited. In addition, the polyarylate resin also has a problem that it is thermally deteriorated during heat molding and colored brown.

  In order to solve the above problems, it is known in Patent Document 1 that an ester compound of a phenol compound having two or more phenolic hydroxyl groups and a phosphite compound is added to polyarylate. In Patent Document 2, it is known to further add a lactone compound. In Patent Document 3, it is known that characteristics are improved by adding a specific silane compound, but there are cases where the characteristics are still insufficient, and further characteristic improvements are required.

Japanese Examined Patent Publication No. 4-46299 JP 2002-265766 A JP 2007-119523 A

  An object of the present invention is to provide a polyarylate resin composition having excellent mechanical properties that does not cause discoloration during molding, has excellent heat resistance, and does not discolor even after long-term use.

  As a result of intensive studies to solve such problems, the present inventors have found that a polyarylate resin compound comprising a polyarylate resin, a phosphorus compound, and a specific silane compound can achieve the above object. The headline, the present invention has been reached.

  That is, the gist of the present invention is as follows.

(1) Poly containing 0.01 to 1 part by weight of a phosphorus compound and 0.01 to 1 part by weight of a silane compound represented by the following general formula (I) with respect to 100 parts by weight of a mixture of a polyarylate resin and a polycarbonate resin a polyarylate resin composition, the blending ratio of the polyarylate resin and the polycarbonate resin is 10 / 90-100 / 0 (mass ratio) der is, according to ASTM D648, is measured under a load 1.8MPa heat deflection temperature but polyarylate resin composition characterized der Rukoto 140 ° C. or higher.

In general formula (I), R1 represents any one of a C2-C4 vinyl group, an acryl group, and a methacryl group. R2 to R4 represent an alkoxy group having 1 to 4 carbon atoms or an alkyl group.
(2) A phenolic compound is further contained, and the blending is 0.01 to 1 part by mass with respect to 100 parts by mass of the mixture of polyarylate resin and polycarbonate resin (
The polyarylate resin composition of 1).
(3) A lactone compound is further contained, and the blending is 0.01 to 1 part by mass with respect to 100 parts by mass of the mixture of polyarylate resin and polycarbonate resin (1
Or the polyarylate resin composition of (2).
(4) A molded article obtained by molding the polyarylate resin composition according to any one of (1) to (3).

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  According to the present invention, since the mixture of the polyarylate resin and the polycarbonate resin contains a phosphorus compound and a specific silane compound, discoloration does not occur during the molding process, and furthermore, it has excellent heat resistance and even after long-term use. It is possible to provide a polyarylate resin composition that does not change color and has excellent mechanical properties.

  The resin composition in the present invention comprises a polyarylate resin, a polycarbonate resin, a silane compound, and a phosphorus compound.

  The polyarylate resin used in the present invention is an aromatic polyester composed of an aromatic dicarboxylic acid residue unit and a bisphenol residue unit.

  Examples of polyarylate raw materials for introducing bisphenol residue units include 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 2, 2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dichlorophenyl) propane, 4,4′-dihydroxydiphenylsulfone, 4,4′-dihydroxy Examples include diphenyl ether, 4,4′-dihydroxydiphenyl sulfide, 4,4′-dihydroxydiphenyl ketone, 4,4′-dihydroxydiphenylmethane, 1,1-bis (4-hydroxyphenyl) cyclohexane and the like. These compounds may be used alone or in combination of two or more, and for economic reasons, 2,2-bis (4-hydroxyphenyl) among these compounds. Propane is preferably used, and optimally the compound is used alone.

  Examples of the polyarylate raw material for introducing the aromatic dicarboxylic acid residue unit include terephthalic acid and isophthalic acid. In the present invention, a polyarylate resin composition obtained by mixing both is particularly preferred in terms of melt processability and mechanical properties. The mixing ratio (terephthalic acid / isophthalic acid) is preferably in the range of 90/10 to 10/90 in molar ratio, more preferably 70/30 to 30/70, and most preferably 50/50. Even if the mixing mole fraction of terephthalic acid is less than 10 mol% or more than 90 mol%, a sufficient degree of polymerization may not be achieved when polymerization is performed by the interfacial polymerization method.

  It is desirable that the polyarylate resin made of the raw material as described above has an intrinsic viscosity of 0.4 to 0.8, preferably 0.4 to 0.7, from the viewpoint of mechanical properties and fluidity. In the present specification, the intrinsic viscosity can be determined from the solution viscosity measured at a temperature of 25 ° C. using 1,1,2,2-tetrachloroethane as a solvent.

  As such a polyarylate resin, for example, commercially available U-100, U powder manufactured by Unitika Ltd. can be preferably used.

  The polycarbonate resin used in the present invention is a polycarbonate comprising a bisphenol residue unit and a carbonate residue unit. Since the polycarbonate resin has a bisphenol residue unit similar to the polyarylate resin in the previous period, the polycarbonate resin often shows good compatibility with the polyarylate resin.

  Examples of the bisphenol as a polycarbonate raw material for introducing the bisphenol residue unit include 2,2-bis (4-hydroxyphenyl) propane and 2,2-bis (3,5-dibromo-4-hydroxyphenyl). Propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (3,5-dimethyl-4-hydroxyphenyl) ) Cyclohexane, 1,1-bis (4-hydroxyphenyl) decane, 1,3-Mataha 1,2-bis (4-hydroxyphenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclododecane, 4, 4'-dihydroxydiphenyl ether, 4,4'-dithiodiphenol, 4,4'-dihydroxy-3 3'-dichloro diphenyl ether, 4,4'-dihydroxy-2,5-dihydroxydiphenyl ether, and the like. In addition, US Pat. No. 2,999,835, US Pat. No. 3,028,365, US Pat. No. 3,334,154, US Pat. No. 4,131,575 Diphenols described in the book can be used. These may be used alone or in combination of two or more. Among these compounds, it is preferable to use at least 2,2-bis (4-hydroxyphenyl) propane. For economic reasons, the compound is optimally used alone.

  As precursors for introducing carbonate residue units, carbonyl halides such as phosgene and carbonates such as diphenyl carbonate can be used.

  The polycarbonate resin made of the raw materials as described above has an intrinsic viscosity of 0.4 to 0.8, preferably 0.4 to 0.6, from the viewpoint of mechanical properties and fluidity.

  As such a polycarbonate resin, for example, commercially available Caliber K200-30, 200-13, 200-3 manufactured by Sumitomo Dow can be preferably used.

  A polyarylate resin polymerization method and a polycarbonate resin polymerization method are not particularly limited as long as the object of the present invention is satisfied, and any known method may be used. Further, copolymerization of polyarylate and polycarbonate may be carried out.

  The blending ratio of the polyarylate resin and the polycarbonate resin is 10/90 to 100/0 (mass from the viewpoint of the molding processability of the resin composition and the heat distortion resistance of the molded product. Ratio), preferably 10/90 to 90/10 (mass ratio), more preferably 30/70 to 90/10 (mass ratio). If the blending amount of the polycarbonate is less than this range, it is hardly different from the case of polyarylate resin / polycarbonate resin = 100/0 in terms of fluidity and workability. When the blending amount of the polycarbonate resin exceeds this range, the heat resistance may be inferior.

  The intrinsic viscosity of the resin composition comprising the polyarylate resin and the polycarbonate resin in the present invention is preferably 0.40 to 0.60. If it exceeds 0.60, the melt viscosity becomes high and injection molding becomes difficult. When it is less than 0.40, the impact strength of the obtained molded product tends to be insufficient.

  The phosphorus compound used in the present invention is a phosphite compound and / or a phosphonite compound. Specific examples include, for example, trisnonyl phosphite, trisphenyl phosphite, tristridecyl phosphite, tris (monononylphenyl) phosphite, tris (mono-dinonylphenyl) phosphite, tris (2,4-di-). -T-butylphenyl) phosphite, tris (2-t-butylphenyl) phosphite, tris (2,4-di-t-butyl-5-methylphenyl) phosphite, tris (2,5-di-t -Butylphenyl) phosphite, tris (2-t-butylphenyl) phosphite, tris [2- (1,1-dimethylpropyl) phenyl] phosphite, tris [2,4-di- (1,1-dimethyl) Propyl) phenyl] phosphite, tris (2-cyclohexylphenyl) phosphite, trisphenylphos Ite, tris (octylthioethyl) phosphite, tris (octylthiopropyl) phosphite, tris (cresylthiopropyl) phosphite, tris (3,5-di-t-butyl-4-hydroxyphenyl) phosphite, bis (Nonylphenyl) pentaerythritol diphosphite, 4,4′-butylidene-bis (3-methyl-6-tert-butylphenyl-di-tridecyl) phosphite, 4,4′-butylidene-bis (3-methyl-) 6-t-butylphenyl-di-octyl) phosphite, 1,1,3-tris (2-methyl-4-ditridecyl phosphite-5-t-butylphenyl) butane, bis (2,4-di-) t-butylphenyl) spiropentaerythritol diphosphite, bis (2,6-di-t-butyl-4-methyl) Phenyl) spiropentaerythritol-diphosphite, bis (2,6-di-t-butyl-4-ethylphenyl) spiropentaerythritol-diphosphite, bis (2,4,6-tri-t-butylphenyl) spiropentaerythritol- Diphosphite, tris (2-((2,4,8,10-tetra-tert-butyldibenzo (d, f) (1,3,2) dioxaphosphin-6-yl) oxy) ethyl) amine, Bis (2,4-bis (1,1-dimethylethyl) -6-methylphenyl) ethyl ester phosphorous acid, tetrakis (2,4-t-butylphenyl) [1,1-biphenyl] -4,4 ′ -Diyl bisphosphonite, etc. are mentioned. Among these specific examples, tetrakis (2,4-t-butylphenyl) [1,1-biphenyl] -4,4′-diylbisphosphonite, bis (2,4-bis (1,1-dimethylethyl) It is preferred to use) -6-methylphenyl) ethyl ester phosphorous acid. Specific product examples include IRGAFOS P-EPQ, IRGAFOS 38 manufactured by Ciba Specialty Chemicals.

  The compounding amount of the phosphorus compound is 0.01 to 1 part by mass, preferably 0.02 to 0.2 part by mass, with respect to 100 parts by mass of the total amount of the polyarylate resin and the polycarbonate resin. When there is too little content, the effect which prevents discoloration at the time of the melt-kneading of a resin composition and a shaping | molding process will become scarce. Even if the content is large, not only the effect is saturated, but also economically undesirable. Two or more types of phosphorus compounds may be used in combination, and in that case, the total amount of them may be within the range of the previous period.

  The silane compound blended in the polyarylate resin composition of the present invention is represented by the following general formula (I).

In general formula (I), R1 is any of a vinyl group having 2 to 4 carbon atoms, an acryl group, and a methacryl group.
Represents R2 to R4 represent an alkoxy group having 1 to 4 carbon atoms or an alkyl group.

Examples of specific examples and trade names of such silane compounds, divinyl methyl vinyl silane (GE Toshiba Silicone Co. TSL8317), methyl vinyl dimethoxy silane (GE Toshiba Silicone Co. TSL8315), methyl vinyl diethoxy silane (GE TSL8316 from Toshiba Silicone), dimethylvinylethoxysilane (TSL8318 from GE Toshiba Silicone), vinyltrimethoxysilane (KBM-1003 from Shin-Etsu Chemical), vinyltriethoxysilane (TSL8311 from GE Toshiba Silicone, Shin-Etsu Chemical) Company Ltd. KBE-1003), 3 - methacryloxypropyl methyl dimethoxy silane (GE Toshiba silicone Co. TSL8375, Shin-Etsu Chemical Co., Ltd. KBM-502), 3- methacryloxypropyl trimethoxysilane GE Toshiba Silicone TSL8370, Shin-Etsu Chemical KBM-503), 3-methacryloxypropylmethyldiethoxysilane (Shin-Etsu Chemical KBE-502), 3-methacryloxypropyltriethoxysilane (Shin-Etsu Chemical Co., Ltd.) Examples thereof include KBE-503), 3-acryloxypropyltrimethoxysilane (KBM-5103 manufactured by Shin-Etsu Chemical Co., Ltd.), and 3-acryloxypropylmethyldimethoxysilane (KBM-5102 manufactured by Shin-Etsu Chemical Co., Ltd.).

Among them, the number 2-4 vinyl groups carbons, an acrylic group, a methacrylic group or al chosen functional group 1
And a silane compound having three alkoxy groups having 1 to 4 carbon atoms is preferable in terms of improving the crystallization rate. Specific examples and trade names of such silane compounds include vinyltrimethoxysilane (KBM-1003 manufactured by Shin-Etsu Chemical Co., Ltd.), vinyltriethoxysilane (GE
Toshiba Silicone TSL8311, Shin-Etsu Chemical KBE-1003) , 3 -methacryloxypropyltrimethoxysilane (GE Toshiba Silicone TSL8370, Shin-Etsu Chemical KBM-503), 3-methacryloxypropyltriethoxysilane (KBE-503 manufactured by Shin-Etsu Chemical Co., Ltd.), 3-acryloxypropyltrimethoxysilane (KBM-5103 manufactured by Shin-Etsu Chemical Co., Ltd.), and the like.

  The compounding amount of the silane compound is 0.01 to 1 part by mass, preferably 0.02 to 0.5 part by mass, with respect to 100 parts by mass of the total amount of the polyarylate resin and the polycarbonate resin. If the content is too small, the effect of preventing discoloration during molding of the resin composition and discoloration due to heat during long-term use of the molded product, particularly the effect of preventing discoloration due to heat during long-term use of the molded product becomes poor. . If the content is too large, the above effect cannot be expected for the amount. Two or more kinds of silane compounds may be used in combination, and in that case, the total amount thereof may be within the above range.

  If the silane compound mix | blended by this invention satisfies the heat resistance, transparency, fluidity | liquidity, and color tone which are the objectives of this invention, the manufacturing method will not be limited and it can manufacture by a well-known method.

  In the present invention, by using a phosphorus compound and a silane compound, the compatibility can be improved even when the kneading degree in the alloying process is low, and a molded product with less thermal discoloration can be obtained. Furthermore, by using a phenolic compound and a lactone compound in combination, a molded article with better color tone can be obtained. In particular, the combined use of lactone compounds is effective.

  Moreover, the polyarylate resin composition of this invention can mix | blend a phenol compound. The phenolic compound used in the present invention is a compound containing a hindered phenol moiety having a substituent at the ortho position of the hydroxyl group, preferably a compound containing a hindered phenol moiety having a substituent at the two ortho positions of the hydroxyl group It is. Examples of the substituent at the ortho position include alkyl groups such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group and t-butyl group. it can. When the phenolic compound has a substituent at two ortho positions of the hydroxyl group in the hindered phenol part, the two substituents may be the same or different, and preferably are t-butyl groups at the same time.

  Preferable phenol compounds containing a hindered phenol moiety having a substituent at two ortho positions of the hydroxyl group include, for example, propionate-based hindered phenol compounds, isocyanurate-based hindered phenol compounds, benzene-based hindered phenol compounds, and triazine-based hinders. Examples thereof include dophenol compounds and phosphoric acid hindered phenol compounds.

  Specific examples of propionate-based hindered phenol compounds include, for example, triethylene glycol-bis-3- (3′-t-butyl-4′-hydroxy-5′-methylphenyl) propionate, hexamethylene glycol-bis- [β. -(3,5-di-t-butyl-4-hydroxy-phenyl) propionate], tetrakis [methylene-3 (3 ', 5'-di-t-butyl-4'-hydroxy-phenyl) propionate] methane, 2,2′-thio [diethyl-bis-3 (3 ″, 5 ″ -di-t-butyl-4 ″ -hydroxyphenyl) propionate], octadecyl-3- (4′-hydroxy-3 ′, 5′- And di-t-butylphenyl) propionate.

  Specific examples of isocyanurate-based hindered phenol compounds include, for example, 1,3,5-tris (3 ′, 5′-di-t-butyl-4′-hydroxybenzoyl) isocyanurate, 1,3,5-tris. (3 ′, 5′-di-t-butyl-4′-hydroxybenzyl) isocyanurate and the like can be mentioned. Specific examples of the benzene hindered phenol compound include, for example, 1,3,5-trimethyl-2,4,6-tris (3 ′, 5′-di-t-butyl-4′-hydroxy-benzyl) benzene. Can be mentioned.

  Specific examples of triazine-based hindered phenol compounds include, for example, 6- (4′-hydroxy-3 ′, 5′-di-t-butylanilino) -2,4-bis-octyl-thio-1,3,5- A triazine etc. can be mentioned. Specific examples of phosphoric acid hindered phenol compounds include, for example, 3 ′, 5′-di-t-butyl-4′-hydroxy-benzylphosphoric acid dimethyl ester, bis (3,5-di-t-butyl- 4-hydroxybenzyl phosphoric acid) monomethyl ester nickel salt and the like.

  Among the above specific examples, it is preferable to use propionate-based hindered phenol compounds, particularly octadecyl-3- (4'-hydroxy-3 ', 5'-di-t-butylphenyl) propionate.

  The content of the phenol compound is 0.01 to 1 part by mass, preferably 0.02 to 0.2 part by mass, with respect to 100 parts by mass of the total amount of the polyarylate resin and the polycarbonate resin. If the content is too small, the effect of preventing discoloration during molding of the resin composition and discoloration due to heat during long-term use of the molded product, particularly the effect of preventing discoloration due to heat during long-term use of the molded product becomes poor. . If the content is too large, the above effect cannot be expected for the amount. Two or more phenolic compounds may be used in combination, and in that case, the total amount thereof may be within the above range.

  A single compound in which phosphorus and phenol are synthesized can also be used. Such compounds include 6- [3- (3-t-butyl-4-hydroxy-5-methyl) propoxy] -2,4,8,10-tetra-t-butyldibenzo [d, f] [ 1,3,2] -dioxaphosphine, and a specific product name is Sumitomo Chemical Co., Ltd. The compounding amount in the case of using this in this invention should just be in the range of the sum total of the addition range of the phosphorus compound in this invention, and the addition range of a phenolic compound. Specifically, the range of 0.02 to 2% is desirable.

  Furthermore, the polyarylate resin composition of this invention can mix | blend a lactone compound. The lactone compound used in the present invention is not decomposed or volatilized by heat during molding (usually 280 to 360 ° C.) and is compatible with the polyarylate / polycarbonate resin component (ester in the ring). A compound having a bond) and an aromatic lactone compound, particularly those having a benzofuranone skeleton, and a 3-aryl-benzofuran-2-one derivative having an aryl group at the 3-position of the benzofuranone ring, benzofuranone A 3-hydroxy-benzofuran-2-one derivative having a hydroxyl group at the 3-position of the ring is optimal.

  The 3-aryl-benzofuran-2-one derivative and the 3-hydroxy-benzofuran-2-one derivative may have one or more alkyl groups having 1 to 15 carbon atoms at any position, and in particular, 5 of the benzofuranone ring. It is preferable to have an alkyl group having 1 to 4 carbon atoms at the 7th and 7th positions. In this case, the substituent at the 5-position and the substituent at the 7-position may be the same or different, and optimally, all are t-butyl groups.

  At the time of melt kneading and molding of the polyarylate resin composition, the phosphorus compound contained in the resin composition may be deactivated, and the lactone compound has the effect of reactivating the deactivated phosphorus compound. is there.

  Specific examples of 3-aryl-benzofuran-2-one derivatives include, for example, 5,7-di-tert-butyl-3- (2,5-dimethylphenyl) -3H-benzofuran-2-one, 5,7- Di-tert-butyl-3- (2,4-dimethylphenyl) -3H-benzofuran-2-one, 5,7-di-tert-butyl-3- (3,4-di-methylphenyl) -3H- Benzofuran-2-one, 5,7-di-tert-butyl-3- (2,3-dimethylphenyl) -3H-benzofuran-2-one, 5,7-di-tert-butyl-3- (4- Methylphenyl) -3H-benzofuran-2-one, 5,7-di-tert-butyl-3- (4-ethylphenyl) -3H-benzofuran-2-one, 5,7-di-tert-butyl-3 -(4-Isopropylphenol Nyl) -3H-benzofuran-2-one, 5,7-di-tert-butyl-3- (4-tert-butyl-phenyl) -3H-benzofuran-2-one, 5,7-di-tert-butyl -3-phenyl-3H-benzofuran-2-one, 5,7-di-tert-butyl-3- (4-dodecylphenyl) -3H-benzofuran-2-one, 5,7-di-tert-butyl- 3- (2,3,4-trimethylphenyl) -3H-benzofuran-2-one, 5,7-di-tert-butyl-3- (2,3,4,5,6-heptamethylphenyl) -3H -A substituted or unsubstituted phenyl group at the 3-position of the benzofuranone ring such as benzofuran-2-one and 5-methyl-7-tert-butyl-3- (4-methylphenyl) -3H-benzofuran-2-one Benzov Lan-2-one derivatives; and substituted or unsubstituted at the 3-position of a benzofuranone ring such as 5,7-di-tert-butyl-3- (9H-fluoren-3-yl) -3H-benzofuran-2-one And benzofuran-2-one derivatives having a polycyclic aryl group.

  Specific examples of 3-hydroxy-benzofuran-2-one derivatives include, for example, 5,7-di-tert-butyl-3-hydroxy-3H-benzofuran-2-one, 7-tert-butyl-5-methyl-3. -Hydroxy-3H-benzofuran-2-one, 5-tert-butyl-7-methyl-3-hydroxy-3H-benzofuran-2-one, 5,7-di-cyclohexyl-3-hydroxy-3H-benzofuran-2 -ON and the like.

  Among these specific examples, it is preferable to use a 3-aryl-benzofuran-2-one derivative, more preferably a benzofuran-2-one derivative having a substituted phenyl group at the 3-position of the benzofuranone ring, Most preferred is 7-di-tert-butyl-3- (3,4-di-methylphenyl) -3H-benzofuran-2-one.

  A specific product example of the lactone compound is HP-136 manufactured by Ciba Specialty Chemicals.

  The content of the lactone compound is 0.005 to 1 part by mass, preferably 0.01 to 0.2 part by mass, with respect to 100 parts by mass of the total amount of the polyarylate resin and the polycarbonate resin. When there is too little content, the effect which prevents the thermal discoloration of a molded article will become scarce. If the content is too large, not only the effect is saturated, but also economically undesirable. Two or more kinds of lactone compounds may be used in combination, and in this case, the total amount thereof may be within the above range.

  In addition to this, as long as the properties are not impaired, the sliding of pigments, dyes, weathering agents, heat stabilizers, flame retardants, mold release agents, antistatic agents, impact resistance improvers, ultrahigh molecular weight polyethylene, fluororesins, etc. A moving agent or the like can be added.

  In the resin composition of the present invention, the method of blending a resin composition comprising a polyarylate resin and a polycarbonate resin, a silane compound, and other additives is not particularly limited, and each component is uniformly dispersed in the resin composition. What is necessary is just to be in the state. Specific examples include a method in which polyarylate resin, polycarbonate resin, silane compound, and other additives are uniformly blended using a tumbler or Henschel mixer, and then melt-kneaded and pelletized.

  The molded body formed by molding the polyarylate resin composition of the present invention does not cause discoloration during molding processing, further has excellent heat resistance, does not discolor even after long-term use, and has excellent mechanical properties. In particular, it can be used in a lens application having transparency, and can be used in an application that uses a glass lens and is required to reduce the specific gravity of the material and to reduce the weight. For example, the present invention can be applied to a lens component for diffusing light of an automobile headlight, particularly a thick lens component. It can also be used for various light sources, diffuser lenses used for lighting, and lens components for mobile projectors connected to personal computers. It is also suitable as a lens for digital cameras and mobile phone accessories. Can be used. Furthermore, it can also be used as a lens for optical instruments such as laser discs, optical pickup lenses for Blu-ray discs, telescopes, binoculars, and microscopes, glasses for glasses, and sunglasses.

  Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.

1. Raw material, polyarylate resin; U-powder (extreme viscosity 0.55) manufactured by Unitika Ltd. Hereinafter, it is referred to as PAR.
Polycarbonate resin: Caliber 200-30 (extreme viscosity 0.44) manufactured by Sumitomo Dow. Hereinafter, it is referred to as PC.
Silane compound: Vinyltrimethoxysilane, Shin-Etsu Chemical Co., Ltd. KBM-1003 (molecular weight 190.3). Hereinafter referred to as silane compound 1.
-Silane compound; Silane compound; 3-acryloxypropyltrimethoxysilane Shin-Etsu Chemical Co., Ltd. KBM-5102 (218.4). Hereinafter referred to as silane compound 2.
-Phosphorus compound; IRGAFOS38 manufactured by Ciba Specialty Chemicals. Hereinafter referred to as phosphorus compound 1.
Phosphorus compound; P-EPQ manufactured by Ciba Specialty Chemicals. Hereinafter referred to as phosphorus compound 2.
・ Phenol compounds; IRGANOX-1010 manufactured by Ciba Specialty Chemicals
Phosphorus / phenolic compound: Sumitomo Chemical Co., Ltd. Sumilyzer GP
Lactone antioxidant; HP-136 manufactured by Ciba Specialty Chemicals. Hereinafter referred to as a lactone compound.

2. Evaluation Method (1) Intrinsic Viscosity The intrinsic viscosity was determined from the solution viscosity at 25 ° C. using 1,1,2,2-tetrachloroethane as a solvent. From the viewpoint of fluidity and mechanical properties, 0.4 to 0.6 is appropriate.
(2) DTUL (deflection temperature under load)
Measurement was performed at a load of 1.8 MPa according to ASTM D648. 140 degreeC or more is preferable.
(3) Yellow index (yellowness)
A plate with a thickness of 2 mm was formed, and the yellow index (YI) before and after heat treatment at 150 ° C. × 400 h was measured. Less than 10 is preferable.

Examples 1-11
A resin composition in which each raw material was melt kneaded at a barrel temperature of 320 ° C. using a twin-screw extruder (TEM-37BS manufactured by Toshiba Machine Co., Ltd.) at the blending ratio shown in Table 1 and taken up in a strand form from a nozzle. The product was immersed in a water bath, cooled and solidified, cut with a pelletizer, and then dried with hot air at 120 ° C. for 12 hours to obtain pellets of a resin composition. Next, the obtained resin composition pellets were molded at a mold temperature of 100 ° C. using an injection molding machine (IS100E-3S manufactured by Toshiba Machine Co., Ltd.) and at the molding temperatures shown in Table 1 to prepare various test pieces. . Various test pieces were allowed to stand at room temperature for one day or more, and then DTUL and YI were evaluated for these. Further, YI was further evaluated for a specimen heat-treated at 150 ° C. for 400 hours.

Comparative Examples 1-9
Resin composition in which each raw material was melt kneaded at a barrel temperature of 320 ° C. using a twin-screw extruder in the same direction (TEM-37BS manufactured by Toshiba Machine Co., Ltd.) at the blending ratio shown in Table 2, and taken up in a strand form from the nozzle The product was immersed in a water bath, cooled and solidified, cut with a pelletizer, and dried with hot air at 120 ° C. for 12 hours to obtain pellets of a resin composition.
Next, the obtained resin composition pellets were molded at a molding temperature shown in Table 2 at a mold temperature of 100 ° C. using an injection molding machine (IS100E-3S manufactured by Toshiba Machine Co., Ltd.) to prepare various test pieces. Various test pieces were allowed to stand at room temperature for one day or longer, and were evaluated for transparency, flow length, DTUL, and YI. Further, YI was further evaluated for a specimen heat-treated at 150 ° C. for 400 hours.

  Examples 1 to 11 of the present invention are excellent in DTUL and YI, and can be suitably used for automotive lens applications.

  Comparing Example 1 and Example 2, it can be seen that the addition of a lactone compound improves the initial color tone and reduces thermal discoloration.

  Since the resin composition of Comparative Example 1 does not contain a silane compound or a phosphorus compound, the initial color tone is poor and thermal discoloration is large.

  In Comparative Examples 2, 3, 6, and 8, the silane compound is not added or the amount of addition is too small, so that the thermal discoloration is large.

  In Comparative Examples 4, 5, and 7, the thermal discoloration is large because the phosphorus compound is not added or the addition amount is too small.

The resin composition of Comparative Example 9 has a low DTUL because the polyarylate ratio is too small in the polyarylate / polycarbonate weight ratio.

Claims (4)

A polyarylate resin composition containing 0.01 to 1 part by mass of a phosphorus compound and 0.01 to 1 part by mass of a silane compound represented by the following general formula (I) with respect to 100 parts by mass of a mixture of a polyarylate resin and a polycarbonate resin The blend ratio of the polyarylate resin and the polycarbonate resin is 10/90 to 100/0 (mass ratio), and the deflection temperature under load measured at a load of 1.8 MPa according to ASTM D648 is 140 ° C. A polyarylate resin composition characterized by the above.
In general formula (I), R1 represents any one of a C2-C4 vinyl group, an acryl group, and a methacryl group. R2 to R4 represent an alkoxy group having 1 to 4 carbon atoms or an alkyl group. 2. The polyarylate resin composition according to claim 1, further comprising a phenol-based compound, the amount of which is 0.01 to 1 part by mass with respect to 100 parts by mass of the mixture of the polyarylate resin and the polycarbonate resin. 3. The polyarylate resin composition according to claim 1, further comprising a lactone compound, wherein the blending amount is 0.01 to 1 part by mass with respect to 100 parts by mass of the mixture of the polyarylate resin and the polycarbonate resin. object. The molded object formed by shape | molding the polyarylate resin composition in any one of Claims 1-3.