Patent ID: 7026403
Filing Date: 2006-04-11
Classification: B32B,C08F,C08J,C08L,Y10T

Abstract:
1. A process for preparing a thermoplastic membrane, the process comprising: (a) polymerizing propylene or a mixture of propylene and one or more monomers selected from C (b) polymerizing a mixture of ethylene and propylene in the presence of a chiral metallocene catalyst, wherein a crystallizable copolymer of ethylene and propylene is obtained comprising up to 35% by weight ethylene, containing isotactically crystallizable propylene sequences and having a melting point, as determined by DSC, in the range of from 25° C. to 70° C., and a heat of fusion of from 2 J/g to 25 J/g; and (c) blending the propylene polymer of step (a) with the crystallizable copolymer of step (b) to form a blend.