US5177170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiopaque polyurethanes
Assignee: Bayer Corp
•
Filing: 1992-07-02
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Granted: 1993-01-05
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Expires: 2012-07-02
Abstract
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.
Inventors
- 👤 Ashok M. Sarpeshkar
- 👤 Peter H. Markusch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:45
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
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
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.
Claim 2
Dependent Claim
107 words
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.
Claim 3
Dependent Claim
14 words
A radiopaque polyurethane composition according to claim 1 wherein the cycloaliphatic diisocyanate is dicyclohexylmethane-4,4'-diisocyanate.
Claim 4
Dependent Claim
23 words
A radiopaque polyurethane composition according to claim 1 wherein the amount of bromine in the polyurethane composition is 20 to 30% by weight.
Claim 5
Dependent Claim
23 words
A radiopaque polyurethane composition according to claim 1 wherein the weight ratio of component (b) to component (c) is from 10:90 to 40:60.
Claim 6
Dependent Claim
12 words
A radiopaque polyurethane composition according to claim 1 which is optically transparent.
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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) | 1996-01-05 | 1996-07-06 | 1997-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-05 | 2000-07-06 | 2001-01-05 | $3760.00 | Window Closed / Lapsed |
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