The Dow Chemical Company

Steven B Swartzmiller

Jeffrey E Bonekamp

Robert J Donald

Andre J Uzee

Henri J Grunbauer

Jan Brands

Kees-Jeen Van Duin

The invention is a thermoformable polymer blend omprising: A) from 9 to 90 parts by weight of a monovinylidene aromatic polymer or an impact modified monovinylidene aromatic polymer, comprising from 1 to 25 weight percent of a rubber and 75 to 99 weight percent of a monovinylidene aromatic polymer matrix having a weight average molecular weight (M.sub.w) from 50,000 to 400,000, said weight percents being based on the total weight of said impact modified, monovinylidene aromatic polymer; B) from 9 to 90 parts by weight on an olefin polymer, selected from the group consisting of homopolymers of ethylene or propylene and copolymers of ethylene with one or more C.sub.4-8 alpha-olefins; and C) from 1 to 20 parts by weight of a compatibilizing polymer comprising a styrene-isoprene-styrene triblock copolymer having a weight average molecular weight of from about 50,000 to about 110,000 Daltons wherein the styrene contained in the styrene blocks is from about 25 to 50 weight percent of the total polymer and the sum of A), B) and C) is 100 parts.

Thermoformable, chemical resistant polymer blends

The invention is a thermoformable polymer blend comprising: A) from 9 to 90 parts by weight of a monovinylidene aromatic polymer or an impact modified monovinylidene aromatic polymer, comprising from 1 to 25 weight percent of a rubber and 75 to 99 weight percent of a monovinylidene aromatic polymer matrix having a weight average molecular weight (M.sub.w) from 50,000 to 400,000, said weight percents being based on the total weight of said impact modified, monovinylidene aromatic polymer; B) from 9 to 90 parts by weight on an olefin polymer, selected from the group consisting of homopolymers of ethylene or propylene and copolymers of ethylene with one or more C.sub.4-8 alpha-olefins; and C) from 1 to 20 parts by weight of a compatibilizing polymer comprising a styrene-isoprene-styrene triblock copolymer having a weight average molecular weight of from about 50,000 to about 110,000 Daltons wherein the styrene contained in the styrene blocks is from about 25 to 50 weight percent of the total polymer and the sum of A), B) and C) is 100 parts.

The invention is a recycling process for forming a thermoformable polymer blend comprising:

This invention relates to the use of a barrier film consisting essentially of thermoplastic homo- or copolymer polyester resin to protect a styrenic resin sheet which constitutes the inner liner wall of an insulative cabinet wall of, for example, a refrigeration appliance unit from attack by the halogen-containing blowing agents present in the insulative polyurethane foam found within the cabinet wall.

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Newark, OH, United States of America

Steven B Swartzmiller