Heteromorphic polymer compositions comprising backbone polymer of ethylene/alpha olefin interpolymer and branch from backbone

摘要

A heteromorphic polymer composition comprises: (a) a homogeneous linear or substantially linear ethylene/a-olefin interpolymer backbone and (b) a branch appending from the backbone and is derived from a branch polymer which is an ethylene homopolymer or ethylene/a-olefin interpolymer having a density which is at least 0.004 g/cm3 greater than that of the backbone polymer and having a higher crystallinity than that of the backbone polymer. A heteromorphic polymer composition comprises a reacted product of: (a) from 40 to 5 weight percent of a branch-forming polymer, which branch comprises an ethylene homopolymer or ethylene/a-olefin interpolymer and (b) from 60 to 95 weight percent of a backbone-forming material which is ethylene and one or more comonomers or which is a homogeneous linear or substantially linear ethylene/a-olefin interpolymer; and wherein the crystallinity the resultant branch is at least 5 percent greater than the crystallinity of the backbone forming material and wherein the heteromorphic polymer composition has an upper service temperature which is at least 100C greater than a non-reacted blend of the polymer of the branch-forming polymer and the backbone forming material. A hot melt adhesive formulation comprising the above defined heteromorphic polymer composition is also disclosed.