Hydrophilic polyurethanes of improved strength

Details Hydrophilic polyurethanes of improved strength Hydrophilic polyurethanes of improved strength

1992-04-23

1994-08-02

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

424409, 424484, 424486, 424501, 604372, 604228, 623 5, 623 7, 623 12, 521176, 521159, C08G 1830, A61F 214

Patent

active

053346912

ABSTRACT:
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.

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