Patent ID: 7351767

Claim:
A composition, comprising: (i) a monovinylarene-conjugated diene copolymer; (ii) at least 5 wt % of an acrylate terpolymer; wherein the monovinylarene-conjugated diene copolymer comprises sequentially polymerized blocks of the monovinylarene and conjugated diene at a ratio of about 55 to 95 weight percent monovinylarene and 45 to 5 weight percent conjugated diene; wherein the monovinylarene-conjugated diene copolymer is formed by a sequential charge polymerization process including only separate monomer charges, wherein (a) at least two separate charges consist of said conjugated diene; (b) at least two separate charges consist of said monovinylarene; (c) at least two charges of a monoalkali metal initiator are employed; (d) at least one separate charge of each of said monovinylarene and of said conjugated diene follows the last charge of said monoalkali metal initiator; (e) at least one separate charge of conjugated diene precedes the last charge of monoalkali metal initiator; (f) each separate monomer charge homopolymerizes to substantial completion prior to addition of any subsequent charge; (g) the total of the number of separate charges of each of said conjugated diene, of said monovinylarene, and of said monoalkali metal initiator, is not in excess of 3; and (h) the copolymer is thereafter coupled with a polyfunctional coupling agent; wherein the monovinylarene-conjugated diene copolymer comprises at least 0.3 wt % of a hindered phenolic stabilizer; and wherein the acrylate terpolymer comprises styrene, at least 10 wt % of an alkyl acrylate, and at least 5 wt % alkyl methacrylate.