Multi-Stage Polymer Composition and Films Made Therefrom

摘要

A multi-stage polymer composition comprising a crosslinked core having a Tg of from −85 to −10° C.; an intermediate region which comprises one or more intermediate layers, wherein each of the intermediate layers comprises from 88.5 to 99.9 weight percent of units derived from a one or more monomers selected from the group consisting of alkyl(meth)acrylate monomers, from 0 to 5 weight percent of units derived from a cross-linking monomer, a graft-linking monomer, or a combination of two or more thereof, optionally from 0 to 2 weight percent units derived from one or more chain transfer agents; wherein there is a compositional gradient between the intermediate layers such that the Tg transitions from −30° C. to 70° C. over the width of the intermediate region, and an outermost layer which has a Tg of from 40° C. to 110° C. is provided.

主权项

1. A multi-stage polymer composition comprising:
a crosslinked core which comprises greater than 95 weight percent of units derived from one or more monomers selected from the group consisting of alkyl(meth)acrylate monomers, from 0.1 to 5 weight percent of units derived from a cross-linking monomer, graft-linking monomer, or combination thereof, and wherein the crosslinked core has a Tg of from −85 to −10° C.; an intermediate region which comprises one or more intermediate layers, wherein each of the intermediate layers comprises from 88.5 to 100 weight percent of units derived from a one or more monomers selected from the group consisting of alkyl(meth)acrylate monomers, from 0 to 5 weight percent of units derived from a cross-linking monomer, a graft-linking monomer, or a combination of two or more thereof, optionally from 0 to 2.0 weight percent units derived from one or more chain transfer agents; wherein there is a compositional gradient between the intermediate layers such that the compositional gradient transitions between a lower Tg and an upper Tg, wherein said lower Tg is at least −30° C. and said upper Tg is 70° C. or less over the width of the intermediate region, and an outermost layer which comprises from 98.5 to 100 weight percent units derived from one or more monomers selected from the group consisting of alkyl(meth)acrylate, styrenic monomers, and combinations of two or more thereof, from 0 to 1.5 weight percent units derived from one or more chain transfer agents, and has a Tg of from 40° C. to 110° C.