Patent ID: 6130290
Filing Date: 2000-10-10
Classification: C08F,C08L,Y10S

Abstract:
A core-shell impact modifier composition comprising(A) from about 15 to about 85 parts of a core comprising from about 40 to about 60 percent by weight of units derived from at least one vinyl aromatic monomer, from about 20 to about 60 percent by weight of units derived from at least one 1,3-diene, up to about 10 percent by weight of units derived from at least one copolymerizable vinyl or vinylidene monomer, and up to about 5 percent by weight of at least one graft-linking or cross-linking monomer;(B) from about 10 to about 50 parts of an intermediate stage comprising at least about 25 percent by weight of units derived from at least one vinyl aromatic monomer; and(C) from about 5 to about 35 parts of an outer shell comprising from about 2 to about 40 percent by weight of units derived from at least one hydroxyalkyl (meth)acrylate, from about 60 to about 98 percent by weight of units derived from at least one vinyl aromatic monomer, and up to about 25 percent by weight in the shell of units derived from one or more copolymerizable vinyl or vinylidene monomer, and up to about 5 percent by weight of units derived from at least one graft-linking or cross-linking monomer;the core-shell impact modifier having a refractive index of from about 1.55 to about 1.60.