Polyurethanes of improved characteristics biocompatible urea-modified polyurethane from castor oil
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United States of America Patent
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Feb 5, 1991
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N/A
app pub date -
Jul 17, 1990
filing date -
Feb 5, 1988
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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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