Process for preparing polycarbonate copolymer foam suitable for lost foam casting
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United States of America Patent
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Sep 27, 1988
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N/A
app pub date -
Dec 14, 1987
filing date -
Dec 14, 1987
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Expired
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Abstract
The evaporative casting of molten metals has been shown to produce castings having smooth surfaces without any sign of carbon deposits thereon by using a copolymer polycarbonate prepared from cyclohexene oxide, cyclopentene oxide, cycloheptene oxide, or isobutylene oxide and carbon dioxide.
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