Patent ID: 6054533
Filing Date: 2000-04-25
Classification: C08G,C08L

Abstract:
A process for forming a compatibilized blend of a thermoplastic elastomer and a polyolefin, comprising steps of:heating the thermoplastic elastomer and polyolefin in the presence of a compabilizing agent to a temperature above the melting point of said thermoplastic elastomer and said polyolefin; andmixing the heated thermoplastic elastomer, polyoletin, and compatibilizing agent to form a blend;wherein said compatibilizing agent is a thermoplastic polyurethane derived from a reaction of a diisocyanate, a chain extender, and a hydrocarbon polymer having a number average molecular weight of not greater than 10,000 and having isocyanate-reactive functional groups, wherein said hydrocarbon polymer contains a solely hydrocarbon chain between said functional groups, wherein said hydrocarbon polymer is derived from one or more dienes having a total of from 4 to 8 carbon atoms, and wherein said hydrocarbon polymer has isocyanate-reactive functional groups selected from a group consisting of amines and hydroxyls: wherein said chain extender is selected from a group consisting of diamines, alkanolamines, and diols, wherein said diols have a total of from 2 to 15 carbon atoms; wherein the compatibilizing agent has hard segments and soft segments, wherein the compatibilizing agent is at least 25 percent by weight based upon the total weight of the compatibilizing agent soft segments, and wherein said hard segments result from reactions of the diisocyanate and the isocyanate-reactive functional groups or from reactions of the diisocyanate and the chain extender.