Patent ID: 7973104
Filing Date: 2011-07-05
Classification: C08F,C08L

Abstract:
1. A rubbery polymer having improved properties, which is comprised of art inner core and an outer shell, wherein the inner core is comprised of a polymeric structure having repeat units which are derived from a mixture of (a) butyl acrylate, (b) a member selected from the group consisting of methyl methacrylate, ethyl methacrylate, methyl acrylate, and ethyl acrylate, (c) optionally, an alkoxy ethyl acrylate or an alkoxy ethyl methacrylate, (d) acrylonitrile, (f) a cross-linking agent selected from the group consisting of difunctional acrylates, difunctional methacrylates, trifunctional acrylates, trifunctional methacrylates, divinyl benzene, and 1,4-butanediol dimethacrylate, and (g) a monomer containing reactive cure sites, wherein the reactive cure sites are glycidyl groups, wherein the outer shell is comprised of a polymeric structure having repeat units which are derived from (d) about 4 weight percent to about 30 weight percent acrylonitrile, (e) styrene, and (f) additional cross-linking agent, wherein the outer shell is void of repeat units which are derived from methyl methacrylate.