[특허]Microporous polymeric foams and microtextured surfaces

Microporous polymeric foams and microtextured surfaces 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08J-009/28
출원번호	US-0562430 (1995-11-24)
발명자 / 주소	Shalaby Shalaby W. Roweton Susan L.
출원인 / 주소	Smith & Nephew, Inc.
대리인 / 주소	Pravel, Hewitt, Kimball & Krieger
인용정보	피인용 횟수 : 39 인용 특허 : 0

초록 ▼

Highly uniform microporous foam suitable for medical applications and methods for preparing these foams. The highly uniform microporous foams are of controlled pore size that may be utilized in a variety of applications. In preparing the foams, an organic crystalline polymer is melted and combined with a selected solid crystalline fugitive compound to produce a substantially isotropic solution. The solution is cooled under controlled conditions, which foster solid--solid phase separation by the simultaneous crystallization of the fugitive compound and the polymer, to produce a foam precursor containing the solidified fugitive compound dispersed through a matrix of the organic polymer. Crystals of fugitive compound are then removed by solvent extraction and/or sublimation, or like process to produce microcellular foams having a continuous, open-cell structure.

대표청구항 ▼

[ What is claimed is:] [1.] A foam comprising:a highly uniform continuous matrix including an organic crystalline thermoplastic polymer and highly uniform, continuous, open-cell pores dispersed in said matrix, the foam produced by a process comprising the steps of:melting the polymer with a solid crystalline additive composition to form an isotropic solution, said additive composition having a melting point above 25.degree. C. and having at least one of the following physical characteristics:(i) a sublimation temperature between about 25.degree. C. and the lower of the degradation, melting or glass transition temperature of the polymer, and(ii) extractability by solvents which are not solvents for the polymer;solidifying the isotropic solution such that the additive composition and the polymer separate by essentially simultaneous crystallization to produce a foam precursor containing crystals of the additive composition; andremoving crystals of the additive composition from the foam precursor to produce a highly uniform continuous, open-cell foam, wherein the removing is accomplished by a process selected from the group consisting of solvent extraction, sublimation and a combination of solvent extraction and sublimation.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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Microporous polymeric foams and microtextured surfaces 원문보기

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Microporous polymeric foams and microtextured surfaces 원문보기

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이 특허를 인용한 특허 (39)

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