Articles resistant to attack by fatty substances, made from polystyrene blends, and compositions
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United States of America Patent
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Feb 12, 1980
Grant Date -
N/A
app pub date -
Mar 30, 1978
filing date -
Mar 30, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Shaped articles which are resistant to attack by fatty substances and chemicals and which have impact resistance comparable to high impact polystyrene are produced by extrusion or injection molding of a composition consisting essentially of high impact styrene-butadiene graft copolymer or a mixture thereof with no more than about 55% styrene homopolymer and small proportions of polyethylene or polypropylene and of a block copolymer X-Y-X in which each X is a polystyrene block of about 5,000 to 10,000 molecular weight and Y is a hydrogenated polybutadiene block of 25,000 to 50,000 molecular weight. The articles are characterized by having a skin which is substantially enriched in polyolefin.
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