Hydrophilic polyurethanes of improved strength
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08G-018/30
A61F-002/14
출원번호
US-0872893
(1992-04-23)
발명자
/ 주소
Gould Francis E. (Princeton NJ) Johnston Christian W. (Neshanic Station NJ)
출원인 / 주소
Tyndale Plains-Hunter Ltd. (Princeton NJ 02)
인용정보
피인용 횟수 :
38인용 특허 :
0
초록▼
The strength and integrity of hydrophilic polyurethane resins prepared by reacting a diol component, an organic chain extender and an organic diisocyanate are improved by critical selection of the diol component, the amount of water in the reaction mixture and the mole ratios of the reactants. The d
The strength and integrity of hydrophilic polyurethane resins prepared by reacting a diol component, an organic chain extender and an organic diisocyanate are improved by critical selection of the diol component, the amount of water in the reaction mixture and the mole ratios of the reactants. The diol component is at least one of (1) a long chain poly(oxyethylene) glycol of molecular weight above 2500 and (2) a medium chain poly(oxyethylene) glycol or polyester glycol of 250-2500 molecular weight. The chain extender is a difunctional compound having a molecular weight of less than 250. The amount of water in the reaction mixture is 0.5 to 2.5 weight % and the urea content of the resins is from about 13.6 to 33.7 weight %. This invention also includes uses of these hydrophilic polyurethane resins as carrier vehicles for various active agents including a medicament, fungicide, pesticide, insecticide, fertilizer, fragrance, flavor, sun-screen, depilatory, cosmetic, contraceptive, anti-fogging agent, hair spray formulation and perfume.
대표청구항▼
A carrier system comprising an active agent the active agent is selected from a medicament, fungicide, pesticide, insecticide, fertilizer, fragrance, flavor, sun-screen, depilatory, cosmetic and a contraceptive and as a carrier vehicle therefor, a substantially non-covalently crosslinked hydrophilic
A carrier system comprising an active agent the active agent is selected from a medicament, fungicide, pesticide, insecticide, fertilizer, fragrance, flavor, sun-screen, depilatory, cosmetic and a contraceptive and as a carrier vehicle therefor, a substantially non-covalently crosslinked hydrophilic substantially non-foaming polyurethane resin having improved tear strength and improved tensile strength and a urea content of from about 13.6 to 33.7 weight percent consisting essentially of the reaction product of a mixture of: A. a diol component selected from at least one of (1) a long chain poly(oxyethylene) glycol, having a molecular weight of from about 2500 to about 12,000 (2) a medium chain poly(oxyethylene) glycol or polyester glycol, having a molecular weight of from about 250 to about 2500, B. at least one organic chain extender having a molecular weight of less than 250; C. water; and D. an organic diisocyanate; wherein alternative mole ratios of the diol component A and water per mole of chain extender B are as follows: (i) 0.4 to 0.5 of diol component (1), 1.5 to 10.0 of water; (ii) 0.1 to 0.25 of diol component (2), 0.05 to 0.72 of water; (iii) 0.25 to 0.50 of diol component (2), 0.25 to 1.00 of water; (iv) 0.5 to 0.75 of diol component (2), 0.3 to 3.3 of water; or (v) 0.06 to 0.07 of diol component (1), 0.1 to 0.2 of diol component (2) and 0.25 to 1.25 of water; wherein the effective NCO:OH ratio is in the range of 0.85:1 to 1.1:1 and the amount of water in the reaction mixture is in the range of about 1 to about 2.5 wt. %.
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