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특허 상세정보

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Purification, impregnation and foaming of polymer particles with carbon dioxide

특허상세정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B29C-067/22    C08J-009/18    C08J-009/22   
미국특허분류(USC) 264/50 ; 264/37 ; 264/53 ; 264/DIG ; 9
출원번호 US-0546955 (1990-07-02)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 58  인용 특허 : 0
초록

A process for making high-purity foam moldings without the use of organic blowing agents involves the use of inorganic gases such as carbon dioxide, nitrogen, air and other pneumatogens. The process involves the simultaneous impregnation and purification of the polymers with or without foaming. If foaming is not done in the extractor, the polymeric particles can be foamed in pre-expanders or expanded and molded in downstream equipment.

대표
청구항
▼

A process for foaming polymers and copolymers, comprising the steps of (a) placing the desired polymer or copolymer particles in a pressure vessel extractor-impregnator; (b) continuously extracting the polymer particles with a fluid at liquid or supercritical conditions to remove low molecular weight compounds while impregnating the polymer particles with the extracting fluid; (c) separating the purified, impregnated polymer particles from the extractor-impregnator; (d) pre-expanding the purified, impregnated particles at a temperature above the glass tr...

이 특허를 인용한 특허 피인용횟수: 58

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