Patent US4318947A successfully refreshed from Google Patents.
US4318947A
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Polymer coating and curing process for catheters
Assignee: Kendall Co
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Filing: 1981-01-26
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Granted: 1982-03-09
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Expires: 2001-01-26
Abstract
Abstract The curing or cross-linking of fluorinated alkoxy phosphonitrile polymers with organic peroxides is accelerated by the use of a trialkyl aluminum or a dialkyl aluminum hydride. The coating with such polymers of biomedical articles such as embolectomy catheters or Foley retention catheters made of natural or synthetic rubber is facilitated by using for the coating a solution of such polymers in an organic solvent together with an organic peroxide and the new accelerating catalyst.
Inventors
- 👤 Jong Joung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:12
CPC Classifications
C; C08; C08L; C08L85/00; C08L85/02; A; A61; A61L; A61L29/00; A61L29/08; A61L29/085; C08G; C08G79/00; C08G79/02; C08G79/025; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31826
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
In a method of coating catheters made of natural or synthetic elastomers with a solution in an organic solvent of an organic peroxide cross-linking agent, and a linear polymer containing randomly distributed repeating units having the structures: ##STR2## wherein A represents X(CF 2 ) m CH 2 O- and B represents Y(CF 2 ) n CH 2 O-, X and Y each being selected from the group consisting of hydrogen and fluorine, and m and n each being an integer from 1 to 8 inclusive, and the improvement wherein there is included along with the organic peroxide an alkyl aluminum compound having the composition Al R 1 R 2 R 3 wherein R 1 is selected from the group consisting of hydrogen and alkyl having from 2 to 8 carbon atoms and R 2 and R 3 are alkyl having from 2 to 8 carbon atoms.
Claim 2
Dependent Claim
146 words
In a method of coating catheters made of natural or synthetic elastomers with a solution in an organic solvent of an organic peroxide cross-linking agent, and a linear polymer containing randomly distributed repeating units having the structures: ##STR2## wherein A represents X(CF 2 ) m CH 2 O- and B represents Y(CF 2 ) n CH 2 O-, X and Y each being selected from the group consisting of hydrogen and fluorine, and m and n each being an integer from 1 to 8 inclusive, and the improvement wherein there is included along with the organic peroxide an alkyl aluminum compound having the composition Al R 1 R 2 R 3 wherein R 1 is selected from the group consisting of hydrogen and alkyl having from 2 to 8 carbon atoms and R 2 and R 3 are alkyl having from 2 to 8 carbon atoms.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1 wherein said alkyl aluminum compound is trialkyl aluminum.
Claim 4
Dependent Claim
15 words
A method as claimed in claim 1 wherein said alkyl aluminum compound is triisobutyl aluminum.
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) | 1985-03-08 | 1985-09-07 | 1986-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-08 | 1989-09-07 | 1990-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-08 | 1993-09-07 | 1994-03-09 | $7700.00 | Window Closed / Lapsed |