Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1986-09-29
1988-03-08
Ziegler, Jacob
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 82, 525 83, 525902, C08L 3904, C08L 5106
Patent
active
047300230
ABSTRACT:
An impact resistant methacrylic resin composition having improved transparency, weatherability and impact resistance comprising a multi-layer graft copolymer and a methacrylic resin is disclosed. The multi-layer graft copolymer is prepared through 3 step polymerizations as follows: in the first step, a semi-soft copolymer is prepared by polymerizing specific amounts of an alkyl methacrylate having an alkyl group with 1 to 4 carbon atoms, styrene and/or its derivative, alkyl acrylate having an alkyl group with 1 to 8 carbon atoms and a specific polyfunctional monomer; in the second step, a soft copolymer containing alkyl acrylates having an alkyl group with 1 to 8 carbon atoms as the main unit is prepared so that the semi-soft copolymer is included in the inner layer of the soft copolymer; and in the third step, a methacrylic polymer or copolymer is prepared by polymerizing monomers main component of which is alkyl methacrylates having an alkyl group with 1 to 4 carbon atoms or a mixture thereof to form an outermost layer. The third step may be divided into two or more steps. The multi-layer methacrylic copolymer thus obtained is compounded with and dispersed in a methacrylic resin the unit of which is methyl methacrylate.
REFERENCES:
patent: 3661994 (1972-05-01), Hwa et al.
patent: 3793402 (1974-02-01), Owens
patent: 3808180 (1974-04-01), Owens
patent: 4387138 (1983-06-01), Gift
patent: 4443103 (1984-02-01), Kamata et al.
Sato Fumio
Tateyama Masamitsu
Mitsubishi Rayon Company Ltd.
Ziegler Jacob
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