Polycarbonate resin composition

Details Polycarbonate resin composition Polycarbonate resin composition

1992-12-01

1994-06-14

Buttner, David

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525146, 525148, 525433, 525439, C08L 6900

Patent

active

053210867

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
The present invention relates to a polycarbonate resin composition, and more particularly to a polycarbonate resin excellent in physical properties such as mechanical strength, moldability, heat resistance, flame retardance, thermostability, rigidity, impact resistance, solvent resistance, and fluidity, which comprises a polycarbonate having a novel structure and a polyamide resin, a thermoplastic polyester or a polyolefin.
2. Background Arts
As halogen-containing carbonate copolymers, various ones have heretofore been proposed. For example, (i) a copolymer of tetrabromobisphenol A (TBA) and bisphenol A (BPA) (Japanese Patent Publication No. 24660/1972), (ii) a copolymer of tetrabromobisphenolsulfone (TBS) and BPA (Japanese Patent Application Laid-Open No. 123294/1976), (iii) a copolymer of tetrabromothiodiphenol (TBTDP) and BPA (Japanese Patent Application Laid-Open No. 99226/1981), (iv) a copolymer of the statistic mixture of halogenated bisphenol and BPA (Japanese Patent Application Laid-Open No. 136796/1976), and a blend of a copolymer of thiodiphenol (TDP) and BPA with the copolymer of (i) above (Japanese Patent Application Laid-Open No. 50065/1979) have been known.
These copolymers are obtained by copolymerization of halogenated bisphenols which result from substitution of hydrogens, with halogens, of the benzene nucleuses of bisphenols, for the purpose of giving bisphenols a sufficient amount of halogens for providing flame retardance. In any of these copolymers, however, these halogenated bisphenols must be used in a comparatively large amount. This is attended with a problem that the mechanical strength (particularly impact strength) of said polycarbonate must be sacrificed.
Besides the above, a halogen-containing polycarbonate in which halogenated phenol is used as the terminal stopper has been known (Japanese Patent Publication No. 40715/1971).
As an improvement of the above-described defects, a polycarbonate produced by copolymerization of BPA, TBA and TDP has been known (Japanese Patent Application Laid-Open No. 140597/1977). According to said process, the resulting polycarbonate is provided with both of flame retardance and mechanical strength, but not necessarily with sufficient moldability.
In this connection, one of the present inventors has recently succeeded in developing a polycarbonate having a novel structure which is greatly improved in flame retardance, and is excellent in thermostability at molding while maintaining a sufficient mechanical strength and optical properties (Japanese Patent Application Laid-Open No. 200833/1991).
However, said novel polycarbonate was found to have a problem in molding and processing because of its high melt viscosity, though it has superior physical properties to those of conventional polycarbonates.


DISCLOSURE OF THE INVENTION

Under these circumstances, the present inventors have repeated intensive studies to overcome the above problems while maintaining the advantages of the novel polycarbonate as described above.
As a result, it was found that the novel polycarbonate can be greatly improved in fluidity, impact resistance, and solvent resistance by blending a thermoplastic resin including polyamide resin, thermoplastic polyester, and polyolefin, while maintaining the mechanical properties possessed by the conventional polycarbonates. The present invention has been accomplished based on such a finding.
The present invention provides a polycarbonate resin composition which comprises (a) a polycarbonate having a repeating unit (I) represented by the general formula (A): ##STR1## wherein, X.sup.1 to X.sup.4 are independently a halogen atom, a repeating unit (II) represented by the formula (B): ##STR2## and, at the terminal thereof, a trihalogenophenoxy group represented by the general formula (C): ##STR3## wherein X.sup.5 to X.sup.7 are independently a halogen atom, and (b) at least one thermoplastic resin selected from the group consisting of (i) polyamide resin, (ii) thermoplastic polyester, and (iii) polyolefin.


B

REFERENCES:
patent: 3751400 (1973-08-01), Crennan
patent: 5030675 (1991-07-01), Wittmann
patent: 5185425 (1993-02-01), Komatsu

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