US4528343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antithrombogenic elastomer, molded products of the same, and a process for manufacturing the same
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1984-05-07
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Granted: 1985-07-09
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Expires: 2004-05-07
Abstract
Abstract Antithrombogenic elastomers comprising polyurethane or polyurethane urea, containing an organic silicone polymer in the main chain. A process for manufacturing such elastomers and molded products of such elastomers, are also disclosed.
Inventors
- 👤 Kazuaki Kira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:03
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/778; A; A61; A61L; A61L27/00; A61L27/14; A61L27/18; A61L33/00; A61L33/06; A61L33/068; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5096; C08G18/61; Y; Y10; Y10S; Y10S623/00; Y10S623/902; Y10S623/903
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
55 words
An antithrombogenic elastomer for medical use comprising thermoplastic polyurethane or polyurethane urea containing 4 to 15 weight percent of polysiloxane having a molecular weight of 500 to 10,000 in the main chain, and containing a polyether or a polyester having a molecular weight of 500 to 6,000 as a soft segment other than said polysiloxane.
Claim 2
Dependent Claim
55 words
An antithrombogenic elastomer for medical use comprising thermoplastic polyurethane or polyurethane urea containing 4 to 15 weight percent of polysiloxane having a molecular weight of 500 to 10,000 in the main chain, and containing a polyether or a polyester having a molecular weight of 500 to 6,000 as a soft segment other than said polysiloxane.
Claim 3
Dependent Claim
19 words
The elastomer for medical use of claim 1, wherein said polysiloxane has a molecular weight of 700 to 3,000.
Claim 4
Dependent Claim
23 words
The elastomer for medical use of claim 1, wherein said elastomer has a soft segment content of from 40 to 80 weight percent.
Claim 5
Dependent Claim
14 words
The elastomer for medical use of claim 1, wherein said polysiloxane is a polydimethylsiloxane.
Claim 6
Dependent Claim
63 words
The elastomer for medical use of claim 4, wherein said polydimethylsiloxane is of the formula: ##STR7## wherein R 1 to R 6 each stand for an alkylene group having at least one carbon atom, a and e are both integers of from 0 to 30, b and d are both 0 or 1, and c is an integer of from 6 to 134.
Claim 7
Dependent Claim
61 words
An antithrombogenic molded product for medical use composed of an antithrombogenic elastomer comprising thermoplastic polyurethane or polyurethane urea containing 4 to 15 weight percent of polysiloxane having a molecular weight of 500 to 10,000 in the main chain, and containing a polyether or a polyester having a molecular weight of 500 to 6,000 as a soft segment apart from said polysiloxane.
Claim 8
Dependent Claim
61 words
An antithrombogenic molded product for medical use composed of an antithrombogenic elastomer comprising thermoplastic polyurethane or polyurethane urea containing 4 to 15 weight percent of polysiloxane having a molecular weight of 500 to 10,000 in the main chain, and containing a polyether or a polyester having a molecular weight of 500 to 6,000 as a soft segment apart from said polysiloxane.
Claim 9
Dependent Claim
19 words
The product for medical use of claim 6, wherein said polysiloxane has a molecular weight of 700 to 3,000.
Claim 10
Dependent Claim
23 words
The product for medical use of claim 6, wherein said elastomer has a soft segment content of from 40 to 80 weight percent.
Claim 11
Dependent Claim
14 words
The product for medical use of claim 6, wherein said polysiloxane is a polydimethylsiloxane.
Claim 12
Dependent Claim
64 words
The product for medical use of claim 9, wherein said polydimethylsiloxane is of the formula: ##STR8## wherein R 1 to R 6 each stand for an alkylene group having at least one carbon atom, a and e are both an integer of from 0 to 30, b and d are both 0 or 1, and c is an integer of from 6 to 134.
Claim 13
Dependent Claim
84 words
A process for producing the elastomer, for medical use, of claim 1, comprising the step of reacting essentially an isocyanate compound, a compound having active hydrogen and/or isocyanate group and containing in the main chain a polysiloxane of molecular weight of from 500 to 10,000, and a compound having active hydrogen groups and containing polyether or a polyester having a molecular weight of from 500 to 6,000 as a soft segment, and said polysiloxane is 4 to 15 weight percent of all reacting compounds.
Claim 14
Dependent Claim
16 words
The process of claim 11, wherein said polysiloxane has a molecular weight of 700 to 3,000.
Claim 15
Dependent Claim
11 words
The process of claim 11, wherein said polysiloxane is a polydimethylsiloxane.
Claim 16
Dependent Claim
69 words
The process of claim 11, wherein said compound containing polysiloxane is of the formula: ##STR9## wherein R 1 to R 6 each stand for alkylene group having at least one carbon atom, X stands for a group containing active hydrogen, a and e are both integers of from 0 to 30, b and d are both 0 or 1, and c is an integer of from 6 to 134.
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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |