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US 4,059,651 AGranted
Curable blends of EPDM and polypropylene
AssigneeExxon Research & Engineering Co.
InventorWilliam S. Smith, Jr.
Life of this patent
Estimating the term…
Abstract
An EPDM elastomer (e.g. ethylene/propylene/ethylidene norbornene) is blended with polypropylene (70-98 wt. %) and a halogenated phenol resin (1-20 parts per 100 parts of the elastomer). The blend may be cured and molded to provide articles having high flexural modulus and high impact resistance at low temperatures.
Claims5
A molded article exhibiting improved impact resistance in the cured state, said article being prepared from a polymer blend consisting essentially of:
- a. 2 to 30% by weight of a cross-linkable EPDM elastomer wherein the diene component of said EPDM is ethylidene norbornene and said EPDM containing 1 to 20 parts per hundred of a bromomethyl alkylated phenol aldehyde resin as a cross-linking agent to effect curing of said elastomer;
- and
- b. 70 to 98% by weight of a stereoregular polypropylene, said polypropylene being an uncurable component, said elastomer being blended with polypropylene at a temperature above the melting point of the polypropylene, and said cross-linkable EPDM being completely cured by said resin when said blend is subjected to molding temperatures of 350.degree. to 650.degree. F.
Dependencies are inferred from the claim text.