John E Cass

US Patent:

43861873, May 31, 1983

Filed:

Jan 16, 1981

Appl. No.:

6/225674

Inventors:

Michael R. Grancio - South Hamilton MA
David F. Stewart - North Reading MA
John F. Cass - Wakefield MA

Assignee:

Sweetheart Plastics, Inc. - Wilmington MA

International Classification:

C08L 5302
C08L 5502
C08L 2506
C08L 2508

US Classification:

525 96

Abstract:

A thermoformable polymer blend composition comprising at least 50% by weight of an olefin polymer such as polyethylene or polypropylene, from 10 to 48% by weight of a styrene polymer and from 2 to 40% by weight of a thermoplastic styrenic block copolymer rubber, preferably a styrene-butadiene-styrene block copolymer, which acts as a compatibilizer for the olefin and styrene polymers in the blend. This blend can be formed on conventional machinery to give products having the beneficial properties of both types of polymers.

US Patent:

43861881, May 31, 1983

Filed:

Feb 24, 1982

Appl. No.:

6/351784

Inventors:

Michael R. Grancio - South Hamilton MA
David F. Stewart - North Reading MA
John F. Cass - Wakefield MA

Assignee:

Sweetheart Plastics, Inc. - Wilmington MA

International Classification:

C08J 500
C08L 2302
C08L 5302
C08L 2504

US Classification:

525 96

Abstract:

A thermoformable polymer blend composition comprising at least 50% by weight of an olefin polymer such as polyethylene or polypropylene, from 10 to 48% by weight of a styrene polymer and from 2 to 40% by weight of a thermoplastic styrenic block copolymer rubber, preferably a styrene-butadiene-styrene block copolymer, which acts as a compatibilizer for the olefin and styrene polymers in the blend. This blend can be formed on conventional machinery to give products having the beneficial properties of both types of polymers.