JP3428600B2 - Resin composition - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to mechanical properties, thermal properties, electrical properties, fluidity during molding (hereinafter abbreviated as fluidity).
The resin composition having excellent light reflectance, particularly high light reflectance, can be used in a field requiring a high light reflectance such as a liquid crystal display backlight display plate, an illuminated bush switch, and a photoelectric switch reflection plate.

[0002]

2. Description of the Related Art Conventionally, as the light reflector, a glass-made or resin-molded product which has been metal-plated or coated has been used. The glass reflector is heavy and easily broken. The reflector plate obtained by metal-plating a resin molded product has a problem that the plating cost is high and the total cost is high. Therefore, there is a demand for a resin molded product that is low in cost and has high light reflectance without the need for post-processing.

As a method for obtaining a resin molded article having a high light reflectance, for example, the method described in JP-A-57-83549 can be considered. In this publication, an aromatic polycarbonate (hereinafter abbreviated as PC) and a pigment such as titanium oxide,
After uniformly blending the silane coupling agent,
Melt kneading at 0 ° C. to obtain pellets,
It is disclosed that a molded product having a good hue can be obtained by molding at ° C.

According to the description of JP-A-57-83549, a test piece was molded from a composition comprising 90 parts by weight of PC, 10 parts by weight of titanium oxide and 1 part by weight of γ-glycidoxypropyltrimethoxysilane. Although the coloring property was certainly good, the blending amount of titanium oxide was as large as 10 parts by weight, so that the melt viscosity became high and the thin-walled molded product (1.6 × 1
When molding 2.7 x 127 mm), set the resin temperature to 3
It is necessary to set the temperature to 00 ° C. or higher, and as a result, silver frequently occurs on the surface of the test piece, and only a test piece having extremely low tensile strength and elongation at break can be obtained.

In Japanese Patent Publication No. 63-26140, P
A resin composition is disclosed which comprises C and an end-capped polyorganohydrogen siloxane, titanium oxide, and a stabilizer. The composition described in JP-B-63-26140 also has a high melt viscosity, so that the melt-kneading temperature is 288 ° C. and the molding temperature is 300.
Higher than ℃. When used as a light reflector, the addition ratio of titanium oxide is 3 parts by weight or more, preferably 7 parts by weight or more.
~ 15 parts by weight is required. After melting and kneading PC containing 3 parts by weight or more of titanium oxide at 288 ° C. or higher, the resin temperature is 30
When injection molding is performed at 0 ° C or higher, even if a polyorganohydrogen siloxane having a terminal end or a stabilizer is added, the thermal decomposition accelerating action of PC due to titanium oxide cannot be suppressed, silver is generated on the surface of the molded product, and the commercial value is significantly impaired. It was a thing.

Japanese Patent Publication No. 63-31513 also discloses PC, oligomeric or polymeric hydrocarbon oxysiloxanes,
A resin composition comprising a phosphorus stabilizer and an epoxy stabilizer is disclosed. In this case also, since the melt viscosity is high, 28
Melt kneading at 8 to 316 ° C, pelletizing, and pelletizing
A method of molding at a temperature of 16 ° C. or higher is disclosed.

According to the method of Japanese Examined Patent Publication No. 63-31513, the inventors of the present invention, 100 parts by weight of PC, 3 parts by weight of titanium oxide,
1,3-diphenyltetraethoxydisiloxane 0.4
By weight, a composition comprising 0.1 part by weight of a phosphorus-based stabilizer and 0.1 part by weight of an epoxy-based stabilizer is melt-kneaded to obtain pellets, and an impact test piece and a tensile test piece according to ASTM-D638 are obtained. Molded. Although the obtained test piece had good colorability, a large amount of silver was generated on the surface of the test piece and the elongation at break was as low as 5% or less, which was very low in practicality.

Japanese Unexamined Patent Publication (Kokai) No. 3-247670 discloses a method of adding titanium oxide or the like surface-treated with a copolymer of a polyoxyalkylene derivative and maleic acids to PC. According to the description of the publication, the viscosity average molecular weight of the pellet obtained by adding 1% of the surface-treated titanium oxide to PC was treated for 1 hour in a nitrogen stream at 340 ° C., the decrease in viscosity average molecular weight was about 10%.
It is said to be as low as 00.

The inventors of the present invention also blended 7 parts by weight of surface-treated titanium oxide with 100 parts by weight of PC according to JP-A-3-247670, melt-kneading the mixture with a single screw extruder at a cylinder temperature of 280 ° C., and then pelletizing. . After pre-drying the pellets at 120 ° C. for 7 hours, a test piece was molded at a resin temperature of 300 ° C. This test piece may have a high compounding ratio of titanium oxide, silver is generated on the surface of the test piece, and the light reflectance of the portion where silver is not generated and the portion where silver is not generated are different, and as a resin composition for a reflector, Is inappropriate.

[0010] Japanese Patent Laid-Open No. 4-159359, PC and A <br/> Rumini U arm and silicon titanium oxide powder treated with hydrous oxide of a composition comprising a specific silicon compound and a reflection plate It is disclosed to be effective. However, the PC itself has a high melt viscosity, and the composition obtained by blending 5 parts by weight or more of the titanium oxide powder treated by the above method with 100 parts by weight of PC has an even higher melt viscosity, resulting in a higher molding temperature. Otherwise, the thin-walled molded product could not be molded.
Even in a PC composition containing 5 parts by weight or more of titanium oxide powder treated by the above method, when molded at a high temperature of 300 ° C. or higher, PC is decomposed, and the light reflectance is lowered due to the generation of silver. Only a molded product having a remarkably low commercial value was obtained due to deterioration of mechanical properties.

In order to lower the resin temperature during molding, a low molecular weight PC having a low melt viscosity, for example, a viscosity average molecular weight of 1500
In a composition in which 5 parts by weight or more of titanium oxide powder and a silane coupling agent or a heat stabilizer are mixed with 0 PC, silver does not occur, but cracks easily occur and mechanical properties are deteriorated. Large and difficult to obtain the desired product.

[0012]

DISCLOSURE OF THE INVENTION The present invention has excellent mechanical properties, thermal properties, electrical properties, fluidity at the time of molding, can be molded at low temperature, does not generate silver, and has a particularly high light reflection. Another object is to provide a resin composition capable of imparting a light reflection plate having an index.

[0013]

SUMMARY OF THE INVENTION In view of the above circumstances, the present inventors have made various investigations and made a resin composition in which titanium oxide is mixed with a resin composition composed of an aromatic polycarbonate resin and a thermoplastic polyester. Resin composition containing a silane coupling agent or an organic halogen compound having a molecular weight of 1000 or more as a flame retardant has excellent fluidity during molding, can be molded at a low temperature, and does not generate silver. It has been found that it is suitable as a light-reflecting plate-like resin composition because it is excellent in high light reflectance, whiteness, load deflection temperature and mechanical strength.

That is, according to the present invention, (A) (a ₁ ) aromatic polycarbonate of 90 to 40% by weight and (a ₂ ) thermoplastic polyester of 10 to 60% by weight relative to 100 parts by weight of a resin composition, B) 3 to 25 parts by weight of titanium oxide
And (C) a resin composition containing 7 to 20 parts by weight of an organic halogen compound having a molecular weight of 1000 or more.

Since the resin composition of the present invention is excellent in thermal stability and fluidity, it can be molded at a relatively low temperature,
The resin temperature at the time of injection molding can mold a molded product with almost no silver even at around 300 ° C., but is preferably 290 ° C. or less, more preferably 280 ° C. or less. The resin temperature at the time of injection molding is slightly different depending on the molding machine, but usually it is higher than the cylinder set temperature by 5 to 20 ° C., and care must be taken in that respect.

In the resin component constituting the resin composition of the present invention, when the proportion of PC is lower than 40% by weight, the deflection temperature under load and the impact strength are largely decreased, which is not preferable. On the other hand, when the proportion of PC is more than 90% by weight, the fluidity is largely lowered, the resin temperature during molding exceeds 300 ° C., silver is liable to be generated, and the practicality is impaired, which is not preferable. Therefore, the proportion of PC is set in the above range, and the blending ratio of the thermoplastic polyester which is another resin component is 10 to 60% by weight.

The viscosity average molecular weight of PC is 18,000.
˜28,000, preferably 20,000 to 26.0
00. If the viscosity average molecular weight of PC is lower than 18,000, the mechanical properties are largely deteriorated, and if it exceeds 28,000, the melt viscosity is too high, and the resin temperature during molding becomes higher than 300 ° C., which is not preferable.

As the PC used in the present invention, one obtained by a conventionally known manufacturing method is used. That is, in the presence of an organic solvent inert to the reaction, an aqueous alkali solution, a dihydric phenol compound and phosgene are reacted, and then a polymerization catalyst such as a tertiary amine or a quaternary ammonium salt is added to perform polymerization. Polymerization method, a pyridine method or the like in which a dihydric phenol compound is dissolved in pyridine or a mixed solution of pyridine and an inert solvent, and phosgene is introduced to directly produce PC. In the above reaction, when necessary, Molecular weight regulators, branching agents, etc. are used.

Specific examples of the dihydric phenol compound used in the production of PC include 2,2-bis (4-hydroxyphenyl) propane (= bisphenol A), bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4
-Hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) octane, 2,2-bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-
Hydroxy-3-methylphenyl) propane, 1,1-
Bis (4-hydroxy-3-tert-butylphenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane , Bis (hydroxyaryl) alkanes such as 2,2-bis (4-hydroxy-3,5-dichlorophenyl) propane;
Bis (hydroxyaryl) cycloalkanes such as 1,1-bis (4-hydroxyphenyl) cyclopentane and 1,1-bis (4-hydroxyphenyl) cyclohexane; 4,4′-dihydroxydiphenyl ether, 4, Dihydroxydiaryl ethers such as 4'-dihydroxy-3,3'-dimethyldiphenyl ether; 4,4'-Dihydroxy-3,3'-dimethyldiphenyl sulfides such as dihydroxydiaryl sulfides; Dihydroxy diaryl sulfoxides such as 4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide; 4,4'-dihydroxy-
Dihydroxydiarylsulfones such as 3,3′-dimethyldiphenylsulfone may be used alone or in combination of two or more.

As the thermoplastic polyester used in the present invention, aliphatic polyester, aromatic polyester, wholly aromatic polyester and the like can be used. Specifically, a polycondensate obtained from a dicarboxylic acid or its derivative and a divalent or higher polyhydric alcohol or a polyhydric phenol compound;
Examples thereof include polymers obtained from dicarboxylic acids or their derivatives and cyclic ether compounds; polycondensates of metal salts of dicarboxylic acids and dihalogen compounds; ring-opening polymers of cyclic ester compounds. The term "dicarboxylic acid derivative" as used herein means an acid anhydride, an ester, an acid halide or the like. The dicarboxylic acid may be aliphatic or aromatic.

Examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, phthalic acid, chlorophthalic acid, nitrophthalic acid, p-carboxylphenylacetic acid,
p-phenylenediacetic acid, m-phenylenediglycolic acid, p-phenylenediglycolic acid, diphenyldiacetic acid, diphenyl-p, p'-dicarboxylic acid, diphenylether-p, p'-dicarboxylic acid, diphenyl-m,
m'-dicarboxylic acid, diphenyl-4,4'-diacetic acid,
Diphenylmethane-p, p'-dicarboxylic acid, diphenylethane-p, p'dicarboxylic acid-stilbenedicarboxylic acid, diphenylbutane-p, p-dicarboxylic acid, benzophenone-4,4'-dicarboxylic acid, naphthalene-
1,4-dicarboxylic acid, naphthalene-1,5-dicarboxylic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, p-carboxyphenoxyacetic acid, p-carboxyphenoxybutyric acid, 1,2 -Diphenoxypropane-p, p-dicarboxylic acid, 1,3-diphenoxypropane-p, p'-dicarboxylic acid, 1,4
-Diphenoxybutane-p, p'-dicarboxylic acid, 1,
5-diphenoxypentane-p, p'-dicarboxylic acid,
1,6-diphenoxyhexane-p, p'-dicarboxylic acid, p- (p-carboxyphenoxy) benzoic acid, 1,
2-bis (2-methoxyphenoxy) -ethane-p,
Examples thereof include p'-dicarboxylic acid and 1,3-bis (2-methoxyphenoxy) -propane-p, p'-dicarboxylic acid.

Examples of the aliphatic dicarboxylic acid include oxalic acid, succinic acid, adipic acid, corkic acid, mazelaic acid, sebacic acid, dodecanedicarboxylic acid, undecanedicarboxylic acid, maleic acid and fumaric acid. Examples of preferred dicarboxylic acids are aromatic dicarboxylic acids, more preferably terephthalic acid, isophthalic acid,
Mention may be made of naphthalene-2,6-dicarboxylic acid.

Examples of the polyhydric alcohol include ethylene glycol, propane-1,2-diol, propane-1,3.
-Diol, butane-1,3-diol, butane-1,
4-diol, 2,2-dimethylpropane-1,3-diol, cis-2-butene-1,4-diol, tr
Examples include ans-2-butene-1,4-diol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, heptamethylene glycol, octamethylene glycol, decamethylene glycol and the like.

Examples of preferred polyhydric alcohols include ethylene glycol, propane-1,2-diol, propane-1,3-diol, butane-1,3-diol, butane-1,4-diol. Of these, ethylene glycol and butane-1,4-diol are more preferable. Examples of the polyhydric phenol compound include hydroquinone, resorcin, 4,4′-dihydroxydiphenyl, bis (4-hydroxyphenyl) methane, 2,2-bis (4-hydroxyphenyl) propane, 1,1-bis (4-hydroxy). Phenyl) cyclohexane, bis (4-hydroxyphenyl) ether, bis (4-hydroxyphenyl) sulfone, bis (4-
Examples thereof include hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) ketone, 4-hydroxyphenyl-3-hydroxyphenylketone and the like.

Examples of the above cyclic ether compound include ethylene oxide and propylene oxide, and examples of the above cyclic ester compound include ε-
Caprolactone and δ-valerolactone may be mentioned. The dihalogen compound that is reacted with the metal salt of dicarboxylic acid means a compound obtained by substituting the hydroxyl group of the polyhydric alcohol or the polyhydric phenol compound with a halogen atom such as chlorine or bromine. The thermoplastic polyester used in the resin composition of the present invention is produced using the above-mentioned raw materials by a known method such as a transesterification method, direct dehydration condensation, and dehalogenation metal by interfacial polycondensation.

Preferred thermoplastic polyesters include polyethylene terephthalate (hereinafter abbreviated as PET), polypropylene terephthalate, polybutylene terephthalate (hereinafter abbreviated as PBT), polyethylene naphthalate, polybutylene naphthalate, polycyclohexane dimethanol terephthalate, and the like. it can. Also,
Copolymerized polyesters such as polyethylene isophthalate / terephthalate, polybutylene terephthalate / isophthalate, polybutylene terephthalate / decane dicarboxylate can also be used. Of these, particularly preferred are PBT and PET.

The thermoplastic polyester which can be used in the present invention has an intrinsic viscosity of 0.3 or more, usually 0.6 to 1. When measured at 30 ° C. in a mixed solvent in which phenol and tetrachloroethylene are mixed at a weight ratio of 6: 4. 5 is preferable,
If it is less than 0.3, the mechanical strength such as elongation at break is lowered, which is not preferable. If the intrinsic viscosity exceeds 1.5, the melt viscosity of the composition increases and the molding temperature also increases, which is not preferable.

The titanium oxide used in the present invention preferably has a rutile type crystal structure produced by the chlorine method from the viewpoint of light resistance of the resin composition. The surface of titanium oxide is zinc oxide ,
Alumina, is obtained by silica treatment can be used. Further known silane coupling agents, for example, cetyltrimethoxysilane, γ-aminopropyltrimethoxysilane,
Methylhydrogenpolysiloxane and titanium oxide treated with an organosilane compound obtained by blending methylhydrogenpolysiloxane with a zirconium salt can be used.

Titanium oxide having a particle size of 0.05 to 5 μm, preferably 0.1 to 1 μm is preferably used. When the particle size of titanium oxide is smaller than 0.05 μm, the light reflectance decreases, while when it exceeds 5 μm, irregularities on the surface of the molded product are conspicuous, causing poor appearance, and mechanical properties, especially elongation at break. Is greatly reduced, which is not preferable.

Titanium oxide is added in an amount of 3 to 25 parts by weight, preferably 7 to 15 parts by weight, based on 100 parts by weight of the resin component. When the compounding ratio of titanium oxide is lower than 3 parts by weight, a thin-walled molded product is not preferable because light rays are transmitted therethrough and the reflectance is lowered. Further, if it exceeds 25 parts by weight, the melt viscosity becomes extremely high, and the resin temperature at the time of molding becomes 3
The temperature exceeds 00 ° C, and P due to titanium oxide
There is a risk that the decomposition of C is promoted, which is not preferable.

The composition of the present invention is V-1 according to UL standard No. 94.
In order to make the above flame retardant, 7 to 20 parts by weight, preferably 7 to 15 parts by weight of an organic halogen compound having a molecular weight of 1000 or more is used.
It is compounded in parts by weight. As such an organic halogen compound, a carbonate oligomer having a degree of polymerization of 3 to 25 using tetrabromobisphenol A as a starting material, brominated polystyrene, a brominated epoxy compound, or the like can be blended. Less than 7 parts by weight of organohalogen compound
Then , the target flame retardancy cannot be obtained. On the other hand, if it exceeds 20 parts by weight, the mechanical strength of the resin composition and the thermal stability during molding are deteriorated, which is not preferable. If the molecular weight of the organic halogen compound used is lower than 1000, it is inconvenient because it is volatilized during melt-kneading to cause environmental pollution or bleed out on the surface of the molded product.

Further, an antimony compound, a zirconium compound or the like can be added as a flame retardant aid.
In addition, the resin component 100 is added to prevent dripping of the fired resin.
A molecular weight of 100 parts by weight in a ratio of 2 parts by weight or less based on parts by weight
It is also possible to blend 20,000 or more of polytetrafluoroethylene.

When a high degree of impact resistance is required for the resin composition of the present invention, the following elastomer can be blended in the range of 1 to 10 parts by weight. If the compounding ratio of the elastomer is less than 1 part by weight, the effect of improving the impact resistance is small, and if it exceeds 10 parts by weight, the deflection temperature under load, the elastic modulus and the light reflectance are largely decreased, which is not preferable.

Specific examples of the elastomer that can be used in the present invention include polybutadiene, styrene-butadiene rubber,
Ethylene / propylene / diene copolymer (EPDM),
Ethylene vinyl acetate copolymer, polyacrylic acid ester, polyisoprene, hydrogenated polyisoprene, acrylic elastomer, polyester / polyether coelastomer, polyamide as sold by Toray Industries under the Pebax brand name. -Based elastomer, a polyamide-based elastomer such as that sold by Dainippon Ink and Chemicals, Inc. under the product name "Grelax A", ethylene.
Butene 1 copolymer, styrene / butadiene block copolymer, hydrogenated styrene / butadiene block copolymer,
Ethylene / propylene copolymer, ethylene / propylene / ethylidene norbornene copolymer, thermoplastic polyester elastomer, hydrogenated styrene / ethylene / sold under the trade name of "Clayton G" from Shell Chemistry.
Butylene / styrene block elastomer (hereinafter SEB
Abbreviated as S), an ethylene-α-olefin copolymer and a propylene-α-olefin copolymer as sold under the trade name of “Toughmer” by Mitsui Petrochemical Co., Ltd.,
Ethylene methacrylic acid type special elastomer such as that sold by Mitsui / Dupont Polychemical Co., Ltd., and the core layer that is rubbery and shell layer such as that sold by Takeda Pharmaceutical Co., Ltd. under the product name of "Stafloyd" Is a core / shell type elastomer made of hard resin, an acrylic (reaction type) elastomer such as that sold by Kureha Chemical Co., Ltd. under the trade name of "Paraloid EXL",
MBS-based Kureha BTA elastomers, core-shell type elastomers such as those sold by Mitsubishi Rayon Co., Ltd. under the trade name of "METABLEN S" can be used. Similarly, a core / shell type elastomer having a core layer made of silicone rubber and a shell layer made of acrylic rubber or acrylic resin, such as those sold by Mitsubishi Rayon Co., Ltd., can be added with grade name S2001 or RK120. Further, a block copolymer composed of a polystyrene phase and a hydrogenated polyisoprene phase as sold under the trade name of "Septon" by Kuraray Co., Ltd. can be used.

The resin composition of the present invention contains polyethylene, polypropylene, polystyrene, high-impact polystyrene, acrylonitrile-butadiene-styrene copolymer, acrylate
Styrene / acrylonitrile copolymer, acrylonitrile / ethylene / styrene copolymer, aliphatic nylon, aromatic nylon, polyphenylene sulfide, thermoplastic resin such as polyether ether ketone, and maleic acid,
Known compatibilizers such as fumaric acid, malic acid, and itaconic acid can be added.

If necessary, the resin composition of the present invention may further contain a known heat stabilizer and antioxidant such as phenol type, phosphite type, thioether type, hindered phenol type, zinc sulfide and zinc oxide. Can be used.
Further, as an antistatic agent, a plasticizer, a lubricant, a release agent, an ultraviolet absorber, that is, a benzotriazole compound, a benzophenone compound, an aromatic benzoate compound, a cyanoacrylate compound, an oxalic anilide compound, and a light stabilizer. A sterically hindered piperidine derivative or a high molecular weight piperidine derivative can also be added.

The resin composition of the present invention can be produced by the equipment and method generally used for producing a thermoplastic resin composition. For example, (1) components constituting the resin composition of the present invention are melt-kneaded together and pelletized. (2) With an extruder having two or more material supply ports, the components other than PC and the flame retardant are melt-kneaded from the first material supply port, PC and the flame retardant are added from the second material supply port, and melted. Knead and pelletize. (3) Components other than PC and the flame retardant are melt-kneaded and pelletized, and PC and the flame retardant are blended into the pellet, and the mixture is melt-kneaded and pelletized. You can also do things. A single-screw or twin-screw extruder can be preferably used for melt-kneading.

Raw materials used in Examples and Comparative Examples of the present invention are as follows.

PC is manufactured by Mitsubishi Gas Chemical Co., Inc., viscosity average molecular weight is 25,000 and 20,000, and bisphenol A is used.
The product name, Iupilon S1000 and S3000 (hereinafter abbreviated as PC1 and PC2), which used as a starting material, was used.

The thermoplastic polyester has an intrinsic viscosity of 0.5.
Polybutylene terephthalate (hereinafter abbreviated as PBT1), polybutylene terephthalate having an intrinsic viscosity of 1.2 (hereinafter abbreviated as PBT2), polyethylene terephthalate having an intrinsic viscosity of 0.9 (hereinafter abbreviated as PET1), polyethylene terephthalate having an intrinsic viscosity of 1.3 (Hereinafter abbreviated as PET2) was used.

Titanium oxide is manufactured by Ishihara Sangyo Co., Ltd., Taipaque, particle size 0.25 to 0.40 μm, main treatment agent is Al,
R-820 (hereinafter abbreviated as Ti1) which is Si and Zn, particle size of 0.25 to 0.40 μm, and R whose main processing agent is Al
-615 (hereinafter abbreviated as Ti2) was used.

Cetyltrimethoxysilane (hereinafter abbreviated as silane) was used as the silane coupling agent.

As a flame retardant, tetrabromobisphenol A manufactured by Mitsubishi Gas Chemical Co., Inc. was used as a starting material, and a carbonate oligomer having a degree of polymerization of 10 and tribumophenol at both ends (hereinafter abbreviated as TBA) was used as a flame retardant. Antimony tetroxide from Mikuni Seiren Co., Ltd. as a fuel aid (hereinafter abbreviated as antimony)
It was used. In addition, polytetrafluoroethylene having a molecular weight of 2,000,000 (hereinafter abbreviated as PTF) was used as a dropping preventing agent in the combustion test.

[0044]

EXAMPLES Next, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Example 1 PC1; 70 parts by weight, PET2; 30 parts by weight, Ti2 ;
10 parts by weight, silane; 1 part by weight , TBA; 0, antimony
And 3 parts by weight of PTF; After drying the pellets at 110 ° C for 5 hours, an injection molding machine (SG125 type manufactured by Sumitomo Heavy Industries, Ltd.) was used to mold at a temperature of 80 ° C.
Resin temperature 270 ° C, injection pressure 98 MPa, ASTM-
A 3.2 mm thick tensile test piece of D638 standard type 1 was molded. 100 x 100 x 2 m under the same conditions as the tensile test piece
m square plate, 127 x 12.7 x 1.6 mm combustion test piece was molded.

Tensile elongation at break (hereinafter abbreviated as elongation) is A
According to STM-D638, 5 tests were conducted at a pulling rate of 5 mm / min and a test temperature of 23 ° C., and the average value was taken. The average value was 65%.

The light ray reflectance (hereinafter abbreviated as reflectance%) is
Shimadzu Corporation UV256-FW type, reflectance meter, measured in the wavelength range of 400 to 700 nm, 500 to 7
The lowest reflectance in the wavelength range of 00 nm was 93%. A reflectance of 90% or more was passed.

The hue is Z-10, manufactured by Nippon Denshoku Industries Co., Ltd.
100 × 100 × 2mm with 0DP color measuring instrument
Measured with a square plate. L value = 94.8, a value = −0.34, b
A value of 2.4 was obtained. The b value <3.0 was regarded as acceptable.

The appearance of the molded product was visually observed by inspecting the combustion test piece, and the test piece without silver was A, the test piece with minute silver was B, the test piece with small silver was C, and the large silver was generated. The obtained test piece was designated as D, and A and B were designated as passed. The appearance of the test piece obtained here is A
Met.

The burning test is based on UL standard No. 94.
From high flame retardancy to V-0, V-1, V-
It is classified into 2, HB and requires flame retardancy in the present invention.
, It must be V-0 or V-1. here
The test piece obtained in 1. was V-0.

Example 2 A test piece was prepared in the same manner as in Example 1 except that the molding temperature and the composition ratio of the composition were set as shown in Table 1, and the test was conducted under the same conditions as in Example 1, The results are shown in Table 1 .

Comparative Examples 1 to 3 Tests were carried out under the same conditions as in Example 1 except that the molding temperature and the composition ratio of the composition were set as shown in Table 1 as in Examples 1 and 2, and the results are shown in Table 1. Shown in 1.

[0053]

INDUSTRIAL APPLICABILITY The present invention is excellent in mechanical properties, thermal properties, electrical properties, and fluidity during molding (hereinafter abbreviated as fluidity),
The resin composition having a particularly high light reflectance can be used in a field requiring a high light reflectance such as a backlight display plate of a liquid crystal display, an illuminated bush switch and a reflection plate of a photoelectric switch.

[0054]

[Table 1]

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Claims (2)

(57) [Claims] 1. (A) 90 to 40% by weight of (a ₁ ) aromatic polycarbonate and (a ₂ ) thermoplastic polyester 1
With respect to 100 parts by weight of the composition consisting of 0 to 60% by weight,
(B) 3 to 25 parts by weight of titanium oxide and (C) molecular weight 1
A resin composition containing 7 to 20 parts by weight of 000 or more organic halogen compounds. 2. The resin composition according to claim 1, wherein the titanium oxide comprises 0.3 to 30 parts by weight of a silane coupling agent based on 100 parts by weight of titanium oxide.