Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1996-08-26
1999-05-04
Buttner, David
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524141, 525 67, 525133, 525 53, 526 65, 526 73, 526342, C08L 6900, C08L 2512, C08L 5104
Patent
active
059004460
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field Of The Invention
The present invention relates to an aromatic polycarbonate-styrene polymer resin composition. More particularly, the present invention is concerned with an aromatic polycarbonate-styrene polymer resin composition comprising an aromatic polycarbonate; a specific rubber-modified styrene polymer; and a compatibility agent which is a specific copolymer containing an aromatic vinyl monomer and which has a non-uniform distribution with respect to the proportions of component monomers constituting the copolymer, so that the copolymer comprises copolymer molecules having different solubility parameter (SP) values, wherein the difference in SP value between the copolymer molecule having a maximum SP value and the copolymer molecule having a minimum SP value is within a specific range, and wherein the copolymer has an average SP value within a specific range. The aromatic polycarbonate-styrene polymer resin composition of the present invention has not only excellent impact strength and heat resistance, but also excellent melt flowability, which is a criterion for excellent molding processability.
The composition according to the present invention may further comprise a flame retardant, especially a phosphate, thereby providing a flame retardant resin composition which has an excellent flame retardancy as well as the above-mentioned excellent properties.
2. Prior Art
Due to their high impact resistance in addition to their high heat resistance, polycarbonate resin compositions obtained by incorporating a rubber-modified styrene polymer into a polycarbonate are widely used in various fields, such as the fields of parts for automobiles, household electrical appliances and office automation machines. However, such polycarbonate resin compositions having excellent impact resistance have a defect of being poor in melt flowability, and there have conventionally been problems in that it has not been possible to achieve both high impact resistance and high melt flowability at the same time.
In recent years, in the above-mentioned fields in which polycarbonate resin compositions are used, it has been desired that a polycarbonate resin composition be used for manufacturing small-thickness molded products and that the molding cycle time be reduced. Hence, there have been increasing demands for achieving an improvement in melt flowability while maintaining high impact resistance.
As prior art for providing polycarbonate resin compositions having an improved melt flowability, a technique of adding ABS resin (acrylonitrile/butadiene/styrene copolymer resin) or MBS resin (methyl methacrylate/butadiene/styrene copolymer resin) to polycarbonates (see Examined Japanese Patent Application Publication No. 38-15225) and a technique of adding polystyrene or rubber-modified polystyrene to polycarbonates (see Examined Japanese Patent Application Publication No. 43-6295) are known. However, the technique of adding an ABS resin or an MBS resin, although it brings about a dramatic improvement in impact strength, does not provide a satisfactory improvement in melt flowability. On the other hand, the technique of adding polystyrene or a rubber-modified polystyrene improves melt flowability but largely decreases impact strength, and hence has only a limited commercial application.
WO Publication No. 80/00027 discloses a resin composition comprising a polycarbonate, a polystyrene and an MBS resin (methyl methacrylate/butadiene/styrene copolymer resin). Although the resin composition of the above-mentioned publication has a high melt flowability, it has extremely low impact strength.
Unexamined Japanese Patent Application Laid-Open Specification No. 2-228353 (corresponding to EP publication No. 379039) discloses a resin composition comprising an impact resistant styrene copolymer comprised of an ethylenically unsaturated nitrile, an olefinic elastomer and styrene, an aromatic polycarbonate and a compatibility agent comprised of a core-shell type elastomer, the compatibility agent being intended
REFERENCES:
patent: 4141934 (1979-02-01), Wingler
patent: 4742115 (1988-05-01), Mawatari
patent: 4748203 (1988-05-01), van Abeelen et al.
patent: 4983658 (1991-01-01), Kress et al.
patent: 5204394 (1993-04-01), Gosens et al.
patent: 5393836 (1995-02-01), Niessner
Nishihara Hajime
Watanabe Akihiro
Asahi Kasei Kogyo Kabushiki Kaisha
Buttner David
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