Process of making crosslinked polyolefin polymer blends and compositions prepared thereof

摘要

Provided herein is a process for making a grafted cross-linked polymer blend, by polymerizing a first and second polymer solution (each having 75 to 99 wt % propylene-derived units, 1 to 25 wt % ethylene-derived units, and 0.05 to 6 wt % diene-derived units); combining the first and second polymer solution to produce a polymer blend solution; removing solvent from the polymer blend solution to produce a polymer blend; mixing the polymer blend with a coagent and a vinyl-terminated silane compound; subjecting the polymer blend to electron beam irradiation to grafting the vinyl-terminated silane compound to either or both of the first polymer and the second polymer to form a grafted polymer blend; and moisture curing the grafted polymer blend to form a grafted cross-linked polymer blend, wherein the grafted cross-linked polymer blend is substantially free of peroxide.

主权项

1. A process for making a grafted cross-linked polymer blend comprising the steps of:
a) polymerizing a first polymer solution comprising a first polymer in a first reactor; b) polymerizing a second polymer solution comprising a second polymer in a second reactor;
wherein the first and second polymers each comprise from about 75 to about 99 wt % propylene-derived units, from about 1 to about 25 wt % ethylene-derived units, and from about 0.05 to about 6 wt % diene-derived units; c) combining the first polymer solution with the second polymer solution to produce a polymer blend solution comprising a solvent, the first polymer, and the second polymer; d) removing the solvent from the polymer blend solution to produce a polymer blend; e) mixing the polymer blend with a coagent and a vinyl-terminated silane compound; f) subjecting the polymer blend to electron beam irradiation, thereby grafting the vinyl-terminated silane compound to either or both of the first polymer and the second polymer in the polymer blend to form a grafted polymer blend; and g) moisture curing the grafted polymer blend to form a grafted cross-linked polymer blend, wherein the grafted cross-linked polymer blend is substantially free of peroxide.