JP5778559B2 - Resin composition - Google Patents

Description

  The present invention relates to a resin composition comprising a blend of a polycarbonate resin and a rubber reinforced styrene resin. More specifically, the chemical resistance and solvent resistance were remarkably improved while maintaining the moldability, impact resistance, heat resistance, etc., which are characteristic of a resin composition comprising a blend of polycarbonate resin and rubber-reinforced styrene resin. The present invention relates to a resin composition comprising a blend of a polycarbonate resin and a rubber-reinforced styrene resin.

  A resin composition comprising a blend of a polycarbonate resin and a rubber-reinforced styrene resin is excellent in impact resistance, heat resistance, paintability, and the like, and is widely used in fields such as electricity, electronics and automobiles. However, when a molded product obtained from a resin composition comprising a blend of a polycarbonate resin and a rubber-reinforced styrene resin is coated, defects such as cracking may occur due to thinner or other chemicals or solvents used in the coating. Therefore, there is a demand for a resin composition comprising a blend of a polycarbonate resin excellent in chemical resistance and solvent resistance and a rubber-reinforced styrene-based resin so that such a problem does not occur.

  As a method for improving chemical resistance, a method of blending polyamide, which is a crystalline resin having excellent chemical resistance, has been proposed (Patent Document 1). However, when a crystalline resin is blended, the molding shrinkage ratio is increased. It is not preferable because the mold used in the resin composition cannot be used and the mechanical strength is lowered due to insufficient compatibility with the resin composition.

Japanese Patent Publication No. 6-313091

  The present invention relates to a polycarbonate resin and a rubber reinforced resin in which the chemical composition and the solvent resistance are remarkably improved while maintaining the impact resistance and heat resistance inherent in the resin composition obtained by blending the polycarbonate resin and the rubber reinforced styrene resin. It aims at providing the resin composition formed by blending a styrene resin.

  As a result of intensive studies in view of the above problems, the present inventors have surprisingly been able to withstand by adding a specific alkyl ketene dimer to a resin composition comprising a blend of a polycarbonate resin and a rubber-reinforced styrene resin. The present inventors have found that chemical properties and solvent resistance can be remarkably improved and have completed the present invention.

That is, the present invention relates to 100 parts by weight of a resin component comprising 95 to 40% by weight of a polycarbonate resin (A) and 5 to 60% by weight of a rubber-reinforced styrene resin (B) and an alkyl ketene dimer (C) represented by the following general formula 1. A resin composition comprising 0.2 to 10 parts by weight is provided.
General formula 1:

（一般式１において、Ｒは、同一でも異なっても良いが、炭素数１４〜１６のアルキル基をあらわす。）

(In general formula 1, R may be the same or different, but represents an alkyl group having 14 to 16 carbon atoms.)

  The resin composition of the present invention is a resin composition that is obtained by blending a polycarbonate resin and a rubber-reinforced styrene resin, and that has significantly improved chemical resistance and solvent resistance while maintaining the impact resistance and heat resistance inherent in the resin composition. Even if various chemicals such as thinner and a solvent adhere to the molded product obtained from such a resin composition, the occurrence of defects such as cracking can be suppressed.

  The polycarbonate resin (A) used in the present invention is obtained by a phosgene method in which various dihydroxydiaryl compounds and phosgene are reacted, or a transesterification method in which a dihydroxydiaryl compound and a carbonate such as diphenyl carbonate are reacted. A typical example of the polymer is a polycarbonate resin produced from 2,2-bis (4-hydroxyphenyl) propane (commonly referred to as bisphenol A).

  Examples of the dihydroxydiaryl compound include bisphenol 4-, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) butane, 2, 2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-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, 2,2-bis ( Bis (hydroxyaryl) alkanes such as 4-hydroxy-3,5-dichlorophenyl) propane, 1,1- (4-hydroxyphenyl) cyclopentane, bis (hydroxyaryl) cycloalkanes such as 1,1-bis (4-hydroxyphenyl) cyclohexane, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3 Dihydroxy diaryl ethers such as 3,3'-dimethyldiphenyl ether, dihydroxy diaryl sulfides such as 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxy-3,3 ' Dihydroxy diaryl sulfoxides such as dimethyldiphenyl sulfoxide, dihydroxy diary such as 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfone Sulfone, and the like.

  These may be used alone or in combination of two or more. In addition to these, piperazine, dipiperidyl hydroquinone, resorcin, 4,4′-dihydroxydiphenyl, and the like may be used in combination.

  Furthermore, the above dihydroxyaryl compound and a trivalent or higher phenol compound as shown below may be used in combination. Trihydric or higher phenols include phloroglucin, 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) -heptene, 2,4,6-dimethyl-2,4,6-tri- (4 -Hydroxyphenyl) -heptane, 1,3,5-tri- (4-hydroxyphenyl) -benzol, 1,1,1-tri- (4-hydroxyphenyl) -ethane and 2,2-bis- [4 4- (4,4'-dihydroxydiphenyl) -cyclohexyl] -propane and the like.

  The viscosity average molecular weight of the polycarbonate resin (A) is not particularly limited, but is usually in the range of 10,000 to 100,000, more preferably 14,000 to 30,000, and even more preferably 16,000 to 26,000 in terms of moldability and strength. Moreover, when manufacturing this polycarbonate resin, a molecular weight modifier, a catalyst, etc. can be used as needed.

  The rubber-reinforced styrene resin (B) used in the present invention is an acrylonitrile / butadiene / styrene copolymer (ABS resin), a high impact polystyrene resin (HIPS), or a methyl methacrylate / butadiene / styrene copolymer (MBS). Resin). Examples of a preferable rubber-reinforced styrene resin (B) include those containing a graft copolymer obtained by graft copolymerization of an aromatic vinyl monomer and a vinyl cyanide monomer component in the presence of a rubbery polymer. More preferred is an ABS resin made by bulk polymerization.

  The compounding amount of the rubber-reinforced styrene resin (B) is 5 to 60% by weight (based on the total amount with the polycarbonate resin (A)). If the blending amount of the rubber-reinforced styrene resin (B) is less than 5% by weight, the molding processability is inferior, and if it exceeds 60% by weight, the heat resistance is unfavorable. The preferred blending amount is 10 to 50% by weight, more preferably 30 to 50% by weight.

The alkyl ketene dimer (C) used in the present invention is a compound represented by the following general formula.
General formula 1:

In general formula 1, R may be the same or different, but is an alkyl group having 14 to 16 carbon atoms.

The compounding amount of the alkyl ketene dimer (C) is 0.2 to 10 parts by weight per 100 parts by weight of the resin component consisting of 95 to 40% by weight of the polycarbonate resin (A) and 5 to 60% by weight of the rubber-reinforced styrene resin (B). It is. If it is less than 0.2 parts by weight, the chemical resistance and the solvent resistance are inferior. If it exceeds 10 parts by weight, granulation processing becomes difficult and it becomes impossible to obtain pellets of the resin composition. A preferable blending amount is 0.2 to 5 parts by weight.

  There are no particular restrictions on the method of blending the various blending components (A), (B), and (C) of the present invention, and these can be mixed with any mixer such as a tumbler, ribbon blender, high-speed mixer, etc. It can be melt-kneaded with a screw or twin screw extruder. Moreover, there is no restriction | limiting in particular also about the mixing | blending order of these compounding components, collective mixing, and division | segmentation mixing.

  When mixing, other known additives such as mold release agents, ultraviolet absorbers, antistatic agents, antioxidants, thermal stabilizers, dyes and pigments, epoxy soy oil, liquid paraffin as necessary Etc.), reinforcing materials (glass fiber, carbon fiber, talc, mica, etc.) and other resins can be blended.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. Parts and% are based on weight unless otherwise specified.

The compounding components used are as follows.
Polycarbonate resin:
Polycarbonate resin synthesized from bisphenol A and phosgene (Caliber 200-20 manufactured by Sumika Stylon Polycarbonate Co., Ltd.)
Viscosity average molecular weight: 19000, hereinafter abbreviated as PC)
Rubber reinforced styrene resin:
Bulk polymerization method ABS resin (Santac AT05, manufactured by Nippon A & L Co., Ltd., rubber amount: 20%,
(Abbreviated as ABS below)
Antioxidant (AO):
6- [3- (3-Methyl-4-hydroxy-5-tert-butylphenyl) propoxy]
-2,4,8,10-tetra-t-butyl-dibenzo [d, f] [1,3,2]
Dioxaphosphepine (Sumitomo Chemical's Sumitizer GP, hereinafter abbreviated as AO)
Alkyl ketene dimer:
In general formula 1, R is an alkyl group having 14 to 16 carbon atoms
( AKD1840 manufactured by Eihisa Hirahara Co., Ltd. , hereinafter abbreviated as AKD)

  The above-mentioned various blending components were collectively put into a tumbler at the blending ratios shown in Tables 1 and 2, and after dry mixing for 10 minutes, using a twin-screw extruder (Kobe Steel KTX37), a melting temperature of 240 ° C. Kneaded to obtain pellets of various resin compositions.

(Evaluation of chemical resistance of molded products)
The pellets of the resin compositions obtained above were each dried at 100 ° C. for 4 hours, and then set using an injection molding machine (Japan Steel Works J-100E-C5) at a set temperature of 250 ° C. and an injection pressure of 1600 kg / cm ^2. A test piece (127 × 13 × 3.2 mm) was prepared.
The obtained test piece was subjected to 0.3% strain using a cantilever chemical resistance test jig (see FIG. 1), and the following chemicals were respectively applied to the center of the test piece.
Drug for evaluation No5700 thinner manufactured by Ohashi Chemical Industry Co., Ltd. (hereinafter abbreviated as thinner)
The test piece after application of the above-mentioned drug was allowed to stand in an atmosphere at 23 ° C. for 72 hours, and then the test piece was bent by hand to evaluate whether the test piece was not broken (◯) / cracked (×). A crack (◯) was determined to be acceptable.

(Evaluation of deflection temperature under load of molded product)
The pellets of the resin compositions obtained above were each dried at 100 ° C. for 4 hours, and then set using an injection molding machine (Japan Steel Works J-100E-C5) at a set temperature of 250 ° C. and an injection pressure of 1600 kg / cm ^2. A test piece according to the ISO test method was prepared, and the deflection temperature under load was measured according to ISO 75-2 using the obtained test piece, and the deflection temperature under load was determined to be 95 ° C. or higher.

(Evaluation of moldability)
After drying the pellets of the various resin compositions obtained above at 100 ° C. for 4 hours,
Measure flow length using Archimedes spiral flow mold (width 10mm, thickness 1.0mm) using injection molding machine (Japan Steel Works J-100E-C5) at set temperature 250 ° C and injection pressure 1600kg / cm ² did. A spiral flow length of 110 mm or more was accepted.

  When the polycarbonate resin composition satisfied the constituent requirements of the present invention (Examples 1 to 5), good results were exhibited over each of chemical resistance, heat resistance and molding processability.

On the other hand, in the case where the polycarbonate resin composition and the resin composition obtained by blending the polycarbonate resin and the rubber-reinforced styrene resin do not satisfy the constituent requirements of the present invention, each case has some drawbacks.
Comparative Example 1 was a case where no ABS resin was blended, and was inferior in molding processability.
Comparative Example 2 was a case where the alkyl ketene dimer was less than the range defined by the present invention, and was inferior in chemical resistance.
In Comparative Example 3, the number of alkyl ketene dimers was larger than the range defined by the present invention, so that pellets could not be produced due to difficulty in granulation.
In Comparative Example 4, the ABS resin was more than the range defined by the present invention, and the heat resistance was poor.

It is explanatory drawing of the jig | tool for chemical-resistant test evaluation of a cantilever.

DESCRIPTION OF SYMBOLS 1 Jig body for chemical-resistant test evaluation 2 Test piece 3 Screw for fixing a test piece 4 Screw which gives distortion to a test piece

Claims (3)

Polycarbonate resin (A) 95 to 40 wt% and the rubber-reinforced styrene resin (B) 100 parts by weight of the resin component consisting of 5 to 60 wt% and an alkyl ketene dimer represented by the following general formula 1 (C) 0.2 to 10 weight A resin composition comprising parts.
General formula 1:

(In general formula 1, R may be the same or different, but represents an alkyl group having 14 to 16 carbon atoms.)   The resin composition according to claim 1, wherein the rubber-reinforced styrene resin (B) is an ABS resin. The blending amount of the alkyl ketene dimer (C) is 0.2 to 5 parts by weight per 100 parts by weight of the resin component consisting of 95 to 40% by weight of the polycarbonate resin (A) and 5 to 60% by weight of the rubber-reinforced styrene resin (B). The resin composition according to claim 1, wherein:

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