Radiopaque polyurethanes
AssigneeMiles Inc.
InventorsAshok M. Sarpeshkar, Peter H. Markusch
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Abstract
This invention relates to radiopaque polyurethane compositions that are reaction products of (a) cycloaliphatic diisocyanates; (b) at least one polyester, polycarbonate, and/or polyester carbonate diol having a molecular weight of from about 1000 to about 6000; (c) an isocyanate-reactive bromine-containing aromatic chain extender; and (d) optionally, a catalyst; wherein the quantity of component (c) is such that the amount of bromine in the polyurethane composition is from 10 to 35% by weight, and wherein the components are reacted at an isocyanate index of from 0.95 to 1.2.
Claims8
An optically clear radiopaque polyurethane composition comprising a reaction product of
- (a) a cycloaliphatic diisocyanate;
- (b) at least one polyester diol having a molecular weight of from about 1000 to about 6000;
- (c) an isocyanate-reactive bromine-containing aromatic chain extender;
- and
- (d) optionally, a catalyst;
- wherein the quantity of component (c) is such that the amount of bromine in the polyurethane composition is from 20 to 30% by weight, and wherein the components are reacted at an isocyanate index of from 0.95 to 1.2.
An optically clear, radiopaque polyurethane composition comprising a reaction product of
- (a) dicyclohexylmethane-4,4'-diisocyanate;
- (b) a polybutylene adipate having a molecular weight of from 2000 to 4000;
- (c) tetrabromobisphenol A bis(2-hydroxyethyl ether) as chain extender;
- and
- (d) optionally, a catalyst;
- wherein the quantity of component (c) is such that the amount of bromine in the polyurethane composition is from 20 to 30% by weight, and wherein the components are reacted at an isocyanate index of from 0.95 to 1.2.
Dependencies are inferred from the claim text.