US5061777A
Expired / Lapsed
US
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Thromboresistant polyetherurethane compounds and process for its production
Assignee: Zeon Corp
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Filing: 1990-07-19
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Granted: 1991-10-29
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Expires: 2010-07-19
Abstract
Abstract A thromboresistant segmented polyetherurethane compound wherein the polyether segment consists of 99 to 1% by weight of (a) a polytetramethylene ether segment having a number average molecular weight of 200 to 5,000 and 1 to 99% by weight of (b) a polyalkylene ether segment having a number average molecular weight of 200 to 5,000 in which the alkylene group has 2 or 3 carbon atoms, said segments (a) and (b) being contained in the same main chain. The segmented polyetherurethane compound is produced by a process comprising reacting 99 to 1% by weight of a polytetramethylene ether diol having a number average molecular weight of 200 to 5,000 and 1 to 99% by weight of a polyalkylene ether diol having a number average molecular weight of 200 to 5,000 in which the alkylene group has 2 or 3 carbon atoms, with a polyisocyanate compound, and reacting the resulting prepolymer with a chain extender.
Inventors
- 👤 Ryuichiro Yoda
- 👤 Akira Fukutome
- 👤 Suguru Ohkawa
- 👤 Kazutoshi Iida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:38
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/4808; A; A61; A61L; A61L33/00; A61L33/06; A61L33/068; C08G18/08; C08G18/10; C08G18/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
80 words
A thromboresistant segmented polyurethane compound wherein the polyether segment consists of 90 to 40% by weight of (a) a polytetramethylene ether segment having a number average molecular weight of 200 to 5,000 and 10 to 60% by weight of (b) a polyalkylene ether segment having a number average molecular weight of 200 to 5,000 in which the alkylene group has 2 or 3 carbon atoms or mixtures thereof, said segments (a) and (b) being contained in the same main chain.
Claim 2
Dependent Claim
80 words
A thromboresistant segmented polyurethane compound wherein the polyether segment consists of 90 to 40% by weight of (a) a polytetramethylene ether segment having a number average molecular weight of 200 to 5,000 and 10 to 60% by weight of (b) a polyalkylene ether segment having a number average molecular weight of 200 to 5,000 in which the alkylene group has 2 or 3 carbon atoms or mixtures thereof, said segments (a) and (b) being contained in the same main chain.
Claim 3
Dependent Claim
38 words
The segmented polyetherurethane compound of claim 1 wherein the polyalkylene ether segment (b) is at least one polymer selected from the group consisting of polyethylene ether, polypropylene ether, ethylene oxide/propyleneoxide random copolymer and polyethyene oxide/polypropylene oxide block copolymer.
Claim 4
Dependent Claim
13 words
The segmented polyetherurethane compound of claim 1 or 2 which is segmented polyurethane.
Claim 5
Dependent Claim
13 words
The segmented polyetherurethane compound of claim 1 or 2 which is segmented polyurethaneurea.
Claim 6
Dependent Claim
17 words
A medical device having a blood-contact surface which is formed from the polyetherurethane compound of claim 1.
Claim 7
Dependent Claim
80 words
A process for producing a thromboresistant segmented polyurethane compound which comprises reacting 90 to 40% by weight of a polyalkylene ether diol having a number average molecular weight of 200 to 5,000 and 10 to 60% by weight of a polyalkylene ether diol having a number average molecular weight of 200 to 5,000 in which the alkylene group has 2 or 3 carbon atoms or mixtures thereof, with a polyisocyanate compound, and reacting the resulting prepolymer with a chain extender.
Claim 8
Dependent Claim
80 words
A process for producing a thromboresistant segmented polyurethane compound which comprises reacting 90 to 40% by weight of a polyalkylene ether diol having a number average molecular weight of 200 to 5,000 and 10 to 60% by weight of a polyalkylene ether diol having a number average molecular weight of 200 to 5,000 in which the alkylene group has 2 or 3 carbon atoms or mixtures thereof, with a polyisocyanate compound, and reacting the resulting prepolymer with a chain extender.
Claim 9
Dependent Claim
39 words
The process of claim 6 wherein the polyalkylene ether diol is at least one diol selected from the group consisting of polyethylene ether glycol, polypropylene ether glycol, ethylene oxide/propylene oxide copolymer diol, and polyethylene oxide-polypropylene oxide block copolymer diol.
Claim 10
Dependent Claim
36 words
The process of claim 5 wherein a mixture of prepolymer derived from the polytetramethylene ether diol and polyisocyanate compound and a prepolymer derived from polyalkylene ether diol and polyisocyanate compound is reacted with the chain extender.
Claim 11
Dependent Claim
32 words
The process of claim 6 wherein a prepolymer derived from the polyisocyanate compound and a mixture of the polytetramethylene ether diol and the polyalkylene ether diol is reacted with the chain extender.
Claim 12
Dependent Claim
19 words
The process of any of claims 6, 7, 8, or 9 wherein the polyisocyanate compound is a diisocyanate compound.
Claim 13
Dependent Claim
24 words
The process of any one of claims 6, 7, 8 or 9 wherein the chain extender is a low-molecular weight diol or a diamine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-28 | 1995-04-29 | 1995-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-28 | 1999-04-29 | 1999-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-28 | 2003-04-29 | 2003-10-29 | $7700.00 | Window Closed / Lapsed |