Radiopaque polyurethanes
AssigneeMiles Inc.
InventorsAshok M. Sarpeshkar, Peter H. Markusch
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Abstract
This invention relates to radiopaque polyurethane compositions which are reaction products of (a) cycloaliphatic diisocyanates; (b) at least one polyether diol having a molecular weight of from about 500 to about 6000; and (c) an isocyanate-reactive bromine-containing compound selected from the group consisting of (i) tetrabromodipentaerythritol and (ii) a mixture of tetrabromodipentaerythritol and dibromoneopentyl glycol; and (d) optionally, a catalyst; wherein the amount of component (c) is such that bromine constitutes at least 15% by weight of the polyurethane composition, wherein the weight ratio of component (b) to component (c) is from about 2:98 to about 55:45, and wherein the components are reacted at an isocyanate index of from about 95 to about 120.
Claims5
A radiopaque polyurethane composition comprising a reaction product of
- (a) a cycloaliphatic diisocyanate;
- (b) at least one polyether diol having a molecular weight of from 500 to 6000;
- (c) isocyanate-reactive bromine-containing compound selected from the group consisting of
- (i) tetrabromodipentaerythritol and
- (ii) a mixture of tetrabromodipentaerythritol and dibromoneopentyl glycol;
- and
- (d) optionally, a catalyst;
- wherein the amount of component (c) is such that the amount of bromine in the polyurethane composition is at least 15% by weight,
- wherein the weight ratio of component (b) to component (c) is from 2:98 to 55:45, and
- wherein the components are reacted at an isocyanate index of from 0.95 to 1.2.
Dependencies are inferred from the claim text.