Patent ID: 9644092
Date: 2017-05-09
CPC Classifications: C08F,C08L

Claim:
1. A heterogeneous in-situ cross-linked polymer blend comprising: (a) a continuous phase comprising a polypropylene having a crystallinity of at least 30% and a melting point temperature T (b) 50 wt % or more by weight of the blend of a dispersed phase comprising particles of an elastomeric copolymer dispersed in the continuous phase and having an average particle size of less than 5 micron, the elastomeric copolymer comprising from 20 to 60 wt % of C3 to C20 α-olefin units by weight of the copolymer, 0.001 to 5 wt % of diene units by weight of the copolymer, and the remainder of the elastomeric copolymer being ethylene-derived units, and having a crystallinity of less than 20% and being at least partially cross-linked such that the degree of cross-link is at least 20%, wherein the diene is selected from the group consisting of 1,7-octadiene, 1,8-nonadiene, 1,9-decadiene, 1,10-undecadiene, 1,11-dodecadiene, 1,12-tridecadiene, and 1,13-tetradecadiene; (c) the blend having a Tensile Strength at break of 0.5 MPa or more, a Tension set of 80% or less, and a melting point temperature T (d) wherein no cross-linking agent is present, and the discrete particles of the elastomeric copolymer are produced by an in-situ cross-linking taking place concurrently with the synthesis of the elastomeric copolymer.