C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 51/04 (2006.01) C08L 35/06 (2006.01)
Patent
CA 2078337
2078337 9115544 PCTABS00007 A rubber-modified, rigid, heat- and impact resistant polymer composition comprising: (a) an interpolymer comprising monovinylidene aromatic monomer, maleimide monomer and ethylenically unsaturated nitrile monomer polymerized therein; and (b) from 7 to 25 weight percent of a first graft copolymer prepared by an emulsion process and comprising from 30 to 70 weight percent of a copolymer (A) comprising in polymerized form from 10 to 60 weight percent of an ethylenically unsaturated nitrile monomer and from 40 to 90 weight percent of a copolymerizable monovinylidene aromatic monomer, the copolymer (A) being grafted at least in part to a rubbery substrate polymer (B) which is from 30 to 70 percent of the graft copolymer by weight and has a rubber particle size distribution wherein the average particle size is from 0.05 to 0.65 microns; and (c) from 17 to 85 weight percent of a second graft copolymer prepared by a mass polymerization technique and comprising a copolymer (C) comprising in polymerized form from 15 to 36 weight percent of an ethylenically unsaturated nitrile monomer and from 64 to 85 weight percent of a copolymerizable monovinylidene aromatic monomer, the copolymer (C) being grafted at least in part to a rubbery substrate polymer (D), the substrate polymer having an average particle diameter of less than 1 micron, said composition having a total rubber content of from 8.5 to 13.5 weight percent, and a mass rubber to total rubber weight ratio of from 0.09 to 0.4. Said composition being useful as a molding material.
Shields Nigel
Van de Langkruis Gerard B.
Smart & Biggar
The Dow Chemical Company
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