Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1990-03-07
1991-06-25
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525146, C08L 6900
Patent
active
050267922
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a polycarbonate resin composition. More specifically, the invention relates to a polycarbonate resin composition excellent in moldability and processability and in heat resistance and also excellent in impact resistance.
PRIOR ART
Although polycarbonates are resins excellent as engineering plastics, they have disadvantages of bad moldability and large thickness dependency in impact resistance and the like, and thus improvement of these disadvantages has been desired.
Heretofore, various proposals have been made for improvement of the moldability of polycarbonates and the impact resistance of thick moldings thereof. For example, it was proposed as a method for improvement of thickness dependency of the impact resistance of polycarbonates and the fluidity thereof in a melted state to compound As resins and MBS resins into polycarbonates (Japanese Patent Publication No. 503/1977). Further, it was proposed to compound MBS resins into polycarbonates (Japanese Patent Publication No. 71/1964). However, both methods could hardly give resin compositions having a high heat distortion temperature.
Further, although a composition comprising polycarbonate(s), and polytetrafluoroethylene was proposed (Japanese Patent Publication No. 858/1973), its impact resistance was not sufficient.
Further, a composition comprising polycarbonate(s) and polyvinylidene fluoride was proposed for the purpose of improvement of light diffusivity and abrasion resistance of polycarbonates (Japanese Laid-Open Patent Publication Nos. 94952/1980 and 253651/1987), and a composition comprising polycarbonate(s) and vinylidene fluoride-hexafluoropropylene copolymer(s) was proposed for the purpose of improvement of the impact resistance and thickness dependency of polycarbonates (Japanese Laid-Open Patent Publication No. 54457/1974). However, all these resin compositions do not necessarily have satisfactory impact resistance.
THE OBJECT OF THE INVENTION
The object of the invention is to provide a resin composition excellent not always in moldability and processability and in heat resistance but also in impact resistance.
CONSTITUTION OF THE INVENTION
The present invention provides a resin composition comprising 30 to 99.5 wt. %, preferably 50 to 99 wt. %, of an aromatic polycarbonate and 70 to 0.5 wt. %, preferably 50 to 1 wt. %, of a fluorine type copolymeric elastomer obtained by copolymerizing vinylidene fluoride and hexafluoroacetone.
The polycarbonate used in the invention can be obtained by reaction of a bisphenol compound with phosgen or a carbonic diester. 2,2-Bis(4-hydroxyphenyl) propane (hereinafter abbreviated as bisphenol A) is particularly preferred as the bisphenol compound, but other bisphenol compounds may be used wherein a part of or whole bisphenol A is substituted by another bisphenol compound. Examples of bisphenol compounds other than bisphenol A include, for example, hydroquinone, resorcinol, 4,4'-di-hydroxydiphenyl, bis(4-hydroxyphenyl)alkane, bis(4-hydroxyphenyl)cycloalkane, bis(4-hydroxyphenyl)sulfide, bis(4hydroxyphenyl)ether, bis(4-hydroxyphenyl)ketone, bis(4hydroxyphenyl)sulfone and bis(4-hydroxyphenyl)sulfoxide, and alkyl-, aryl- and halogen-substituted derivatives thereof, etc.
The copolymer of vinylidene fluoride and hexafluoroacetone used in the invention can be obtained by copolymerizing 40 to 90 mol % of vinylidene fluoride and 60 to 10 mol % of hexafluoroacetone in the presence of a usual radical initiator according to the solution polymerization or bulk polymerization method. Proper polymerization temperature in preparation of the copolymer is 0 to 70.degree. C. The ratio of repetition units in the obtained copolymer is usually about 60 to 95 mol % of vinylidene fluoride to about 40 to 5 mol % of hexafluoroacetone. Proper limiting viscosity [n] of the copolymer at 30.degree. C. using a dimethylacetamide solution thereof is 0.5 to 2.0 dl/g. Copolymers of vinylidene fluoride and hexafluoroacetone can be obtained for example from Central Glass Co., Ltd.
The c
REFERENCES:
patent: 3821326 (1974-06-01), Lauchlan
patent: 4252916 (1981-02-01), Mark
patent: 4617350 (1986-10-01), Maeda
Akiyama Saburo
Kitamura Kazuo
Murakami Naoyuki
Bleutge John C.
Buttner David
Teijin Chemicals Ltd.
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