Thermoplastic elastomers
AssigneeExxon Chemical Patents Inc.
InventorsHenry W. Yang, Jo Ann M. Canich, Gary F. Licciardi
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Abstract
This invention relates to polypropylene blends, particularly blends of high molecular weight amorphous polypropylene with low molecular weight isotactic polypropylene. These blends exhibit unusual elastomeric properties.
Claims8
A polypropylene blend composition comprising about 60 to about 90 weight percent of an amorphous polypropylene having a Mw of at least about 150,000 and a Mw/Mn of about 3 or less and from about 40 to 10 weight percent of a crystalline isotactic polypropylene having a Mw of less than about 300,000, provided that the Mw of the amorphous polypropylene is greater than the Mw of the crystalline isotactic polypropylene.
Dependencies are inferred from the claim text.