Impact modifier, thermoplastic resin composition using the same and molded article obtained therefrom
AssigneeHitachi Chemical Company, Ltd.
InventorsSusumu Era, Toshio Matsumoto, Yoshinori Kobayashi, Masashi Shitara, Isamu Hattori, Yoshihiro Nomura
Life of this patent
Estimating the term…
Abstract
An impact modifier obtained by emulsion polymerizing acrylic monomer(s), etc., in the presence of a conjugated diene rubber to give a graft rubber polymer, or obtained by polymerizing acrylic monomer(s) and the like ethylenically unsaturated monomers in the presence of the graft rubber polymer, is effective for improving impact resistance and weathering resistance of molded articles obtained from thermoplastic resin compositions containing such an impact modifier.
Claims6
An impact modifier of a graft copolymer (C) obtained by (i) emulsion polymerizing
- (a) 99 to 20 parts by weight of a polymerizable monomer mixture comprising
- (I) 0.1 to 20% by weight of a polyfunctional monomer,
- (II) 50 to 99.9% by weight of an acrylic acid alkyl ester, the alkyl moiety thereof having 1 to 13 carbon atoms, and
- (III) 0 to 30% by weight of a copolymerizable vinyl compound other than those mentioned above,
- in the presence of
- (b) 1 to 80 parts by weight of a conjugated diene rubber,
- a total of the components (a) and (b) being 100 parts by weight, to a conversion of 50 to 93% by weight to give a graft rubber polymer (A) containing unreacted polymerizable monomers, and (ii) polymerizing
- (B) 40 parts by weight or less and more than 0 part by weight of one or more monomers comprising
- (IV) 0 to 100% by weight of an acrylic acid alkyl ester having an alkyl moiety of 1 to 13 carbon atoms,
- (V) 0 to 100% by weight of styrene or substituted styrene,
- (VI) 0 to 100% by weight of a methacrylic acid alkyl ester, and
- (VII) 0 to 40% by weight of a vinyl cyanide compound,
- in the presence of 60 parts by weight or more and less than 100 parts by weight of the graft rubber polymer (A), a total of the monomers (B) and the graft rubber polymer (A) being 100 parts by weight.
Dependencies are inferred from the claim text.