| 摘要 |
The invention is a film having a discontinuous phase of open and closed cells and a continuous organic phase comprising: (a) one or more block copolymer(s) corresponding to the Formula I:A-B-Xm-(B-A)n(I)wherein each A is a polymer block derived comprising one or more monovinylidene aromatic monomers, each B is a polymer block derived from one or more conjugated dienes, X is the remnant of a multifunctional coupling agent, m is 0 or 1, and n is an integer from 1 to 5, each A polymer block has a weight average molecular weight from 4,000 to 20,000 Daltons, each B polymer block has a weight average molecular weight from 20,000 to 100,000 Daltons, wherein the block copolymers are optionally hydrogenated; and (b) optionally, an extender which is compatible with the B polymer block, and wherein the organic phase contains from about 5 to about 30 percent by weight of units derived from monovinylidene aromatic monomers and the effective phase volume of the A polymer block in the organic phase is from about 5 to about 20 percent. Also claimed is a process for the preparation of such articles.
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