Patent ID: 6331580
Filing Date: 2001-12-18
Classification: C08F,C08L

Abstract:
A core-shell impact modifier composition comprising:(A) from about 70 to about 85 parts of a core comprising from about 15 to about 35 percent by weight of units derived from at least one vinyl aromatic monomer, and from about 65 to about 85 percent by weight of units derived from at least one diolefin monomer;(B) from about 8 to about 14 parts of an inner graft stage comprising at least one vinyl aromatic monomer or at least one C1-C4 alkyl methacrylate monomer;(C) from about 0.1 to about 5 parts of an intermediate sealer stage consisting essentially of at least one of the following monomers: a C1-C8 alkyl acrylate or a polyunsaturated crosslinker; and(D) from about 10 to about 16 parts of an outer shell comprising at least one C1-C4 alkyl (meth)acrylate monomers or at least one vinyl aromatic monomer,wherein the intermediate sealer stage improves the coverage of the outer shell on the inner stage and core.