Process for preparing polycarbonate copolymer foam suitable for

Metal founding – Process – Shaping a forming surface

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164 34, B22C 702

Patent

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047734663

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.

REFERENCES:
patent: 4633929 (1987-01-01), Santangelo et al.

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