Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1988-09-07
1989-11-14
Pertilla, Theodore E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525148, C08L 6900
Patent
active
048808741
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a polycarbonate resin composition having improved impact resistance, particularly impact strength having less dependency on an article thickness and weld strength.
DESCRIPTION OF THE RELATED ART
Polycarbonate resins are used as engineering resins having good impact strength and heat resistance and in many technical fields. However, as a thickness of a molded article made of the polycarbonate resin increases. its impact strength greatly decreases (dependency of impact strength on thickness).
To improve the impact strength of the polycarbonate resin, many proposals have been made such as addition of an ABS resin (acrylonitrile-diene rubber-styrene copolymer) to the polycarbonate resin (Japanese Patent Publication No. 15225/1963), addition of an AES resin (acrylonitrile-ethylene/propylene rubber-styrene copolymer) to the polycarbonate resin (Japanese Patent Publication No. 48547/1973) and addition of an olefin-glycidylmethacrylate copolymer to the polycarbonate resin (Japanese Patent Publication No. 4897/1969).
Since the number of gates in a mold and flow state of resin melt should be changed according to a shape and size of the article to be molded in injection molding which is one of the most common molding methods, the molded article has so-called a "weld part" at which at least two portions of resin melt flowing in different directions meet each other. However, the article made of the conventional resin compositions has insufficient so-called "weld strength", strength of an article at the weld part in view of the practical use, and the polycarbonate composition is not an excellent material from the practical view point.
As the result of the extensive study by the present invention, it has been found that a resin composition comprising a polycarbonate resin and a specific resin has impact strength which is less dependent on an article thickness and greatly increased weld strength, and the present invention has been completed.
DISCLOSURE OF THE INVENTION
Accordingly, the present invention provides a resin composition comprising
(A) 10 to 99% by weight of a polycarbonate resin and
(B) 90 to 1% by weight of a resin which comprises polymerizing 1 to 800 parts by weight of an unsaturated epoxy monomer and 0 to 2,000 parts by weight of other copolymerizable monomer in the presence of 100 parts by weight of an ethylene-.alpha.-olefin base rubber, and at least one monomer selected from the group consisting of aromatic vinyl compounds, cyanated vinyl compounds and alkyl unsaturated carboxylates.
DETAILED DESCRIPTION OF THE INVENTION
The resin component of the present invention will be illustrated in detail.
Polycarbonate resin
As the polycarbonate resin (A), aromatic polycarbonates, aliphatic polycarbonates, aliphatic-aromatic polycarbonates and the like are exemplified.
Generally, the polycarbonate resin is a polymer or a copolymer prepared from a bisphenol type compound such as 2,2-bis(4-oxyphenyl)alkanes, bis(4-oxyphenyl)ethers and bis(4-oxyphenyl)sulfones, sulfides or sulfoxides. For some end uses, polymers of halogen-substituted bisphenol type compounds may be used.
Preparation methods and kinds of polycarbonate resins are described, for example, in "Polycarbonate Resins" published by Daily Technology Newspaper Company (Nikkan Kogyo Shinbun-sha) (Sept. 30, 1969).
Resin (B)
The ethylene-.alpha.-olefin base rubber constituting the copolymer (b-1) includes a copolymer of ethylene with propylene or butene (EPR), a terpolymer of ethylene, propylene or butene and a non-conjugated diene (EDPM) and the like. These may be used independently or as a mixture thereof.
Examples of the non-conjugated diene contained in the terpolymer (EPDM) are dicyclopentadiene, ethylidenenorbornene, 1,4-hexadiene, 1,4-cyclobutadiene, 1,5-cyclooctadiene and the like.
In the copolymer (EPR) and the terpolymer (EPDM), a molar ratio of ethylene to propylene or butene is preferably from 5:1 to 1:3.
In the terpolymer (EPDM), the non-conjugated diene is contained in an amount corr
Hirai Mikio
Tatsuda Tokuo
Yoshida Tomio
Pertilla Theodore E.
Sumitomo Naugatuck Co. Ltd.
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