US5346981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiopaque polyurethanes
Assignee: Bayer Corp
•
Filing: 1993-01-13
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Granted: 1994-09-13
•
Expires: 2013-01-13
Abstract
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.
Inventors
- 👤 Ashok M. Sarpeshkar
- 👤 Peter H. Markusch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:13
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/75; A; A61; A61L; A61L29/00; A61L29/04; A61L29/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3802; C08G18/3804; C08G18/3806; C08G18/381; C08G18/65; C08G18/66; C08G18/6633
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
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.
Claim 2
Dependent Claim
83 words
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.
Claim 3
Dependent Claim
16 words
An optically clear, radiopaque polyurethane composition according to claim 1 wherein the cycloaliphatic diisocyanate is dicyclohexylmethane-4,4'-diisocyanate.
Claim 4
Dependent Claim
32 words
An optically clear, radiopaque polyurethane composition according to claim 1 wherein component (b) is a polyester diol consisting of a condensation product of adipic acid and a C 4 -C 8 alkanediol.
Claim 5
Dependent Claim
26 words
An optically clear, radiopaque polyurethane composition according to claim 1 wherein component (b) is a polyester diol having a molecular weight of from 2000 to 4000.
Claim 6
Dependent Claim
31 words
An optically clear, radiopaque polyurethane composition according to claim 1 wherein component (b) is a polyester diol consisting of a polybutylene adipate having a molecular weight of from 2000 to 4000.
Claim 7
Dependent Claim
22 words
An optically clear, radiopaque polyurethane composition according to claim 1 wherein the isocyanate-reactive bromine-containing aromatic chain extender is tetrabromobisphenol A bis(2-hydroxyethyl ether).
Claim 8
Dependent Claim
78 words
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.
Claim 9
Dependent Claim
78 words
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.
Claim 10
Dependent Claim
14 words
An optically clear, radiopaque polyurethane composition according to claim 1 prepared by melt processing.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
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