Polyurethanes of improved characteristics biocompatible urea-mod

Details Polyurethanes of improved characteristics biocompatible urea-mod Polyurethanes of improved characteristics biocompatible urea-mod

1990-07-17

1991-02-05

Kight, III, John

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...

528 60, 528 61, 528 745, C08G 1810, C08G 1836

Patent

active

049905864

ABSTRACT:
A urea-modified polyurethane having excellent characteristics is prepared by the reaction between a polyisocyanate and a polyol in the presence of a diamine having the formula ##STR1## in which R.sup.1 and R.sup.2 are independently straight-chain C.sub.2 -C.sub.6 alkyl, and m and n are independently either 1 or 2. The preferred polyol is castor oil, and in preferred methods the reaction is carried out by first forming a prepolymer of the polyisocyanate with the polyol, and then curing this with a solution of the diamine in a further amount of the polyol.

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