[특허]Hydrophilic carboxy polyurethanes

[미국특허] Hydrophilic carboxy polyurethanes 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08G-018/30
출원번호	US-0944667 (1986-12-19)
발명자 / 주소	Johnston Christian W. (Neshanic Station NJ) Teffenhart John M. (Neshanic Station NJ)
출원인 / 주소	Tyndale Plains-Hunter, Ltd. (Princeton NJ 02)
인용정보	피인용 횟수 : 60 인용 특허 : 0

초록 ▼

Hydrophilic polyurethane polymers having carboxy groups in the polymer backbone are prepared by reacting a polyol component, an ester of a carboxylic acid and a polyisocyanate to form a polyurethane intermediate. The intermediate is then saponified and the saponified product neutralized to form free carboxy groups. The water absorption of the intermediates and saponified polymers is above 10% and the polyurethanes may range from rigid solids to gel-like, high water absorptive polymers. Neutralization of the carboxy group with ammonium hydroxide produces a water soluble polyurethane which becomes water insoluble when the ammonia is driven off. The carboxy groups introduced into the polymeric chain provide reactive sites for attachment of various side-groups and also allow for various curing procedures. The polymers exhibit excellent adhesion to various substrates, and are suitable for use as light sensitive photographic layers on films, paper or glass; as boat and pipe coatings for decreasing hydrodynamic drag; as drug delivery systems; as burn and wound dressings; in cosmetic applications; in body implants; as coatings on cannulae; and a host of other applications.

대표청구항 ▼

A hydrophilic polyurethane ester intermediate consisting essentially of the reaction product of (A) a polyol component comprising at least one of (a) an alkylene glycol, (b) a long chain polyoxyalkylene glycol, and (c) a linear polyester diol derived from the condensation of one or more diols with one or more dibasic acids; (B) a carboxylic acid ester component comprising at least one of (a) a hydroxy carboxylic acid ester selected from at least one of [Figure] [Figure] and [Figure] wherein R is an aliphatic group, m and p independently are integers of from 0 to 12, and n is an integer of from 1 to 12; and (b) an amino acid ester having at least two active hydrogen atoms; and (C) an organic isocyanate or isocyanate precursor containing at least two NCO groups; the ratio of NCO to active hydrogen atoms in the reaction mixture being from 0.5/1 to 1/1.

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A	생활필수품
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Hydrophilic carboxy polyurethanes 원문보기