US4100309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated substrate having a low coefficient of friction hydrophilic coating and a method of making the same
Assignee: Hydromer Inc
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Filing: 1977-08-08
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Granted: 1978-07-11
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Expires: 1997-08-08
Abstract
Abstract A substrate is coated with a polyvinylpyrollidone-polyurethane interpolymer. In the method, a polyisocyanate and a polyurethane in a solvent such as methyl ethyl ketone are applied to a substrate and the solvent evaporated. If the substrate is a polyurethane, only the polyisocyanate need be employed. Polyvinylpyrollidone in a solvent is then applied to the treated substrate and the solvent evaporated. The invention is applied, for example, to a tube such as a catheter, a condom and a peristaltic pump tube.
Inventors
- 👤 Michael J. Micklus
- 👤 David T. Ou-Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:53
CPC Classifications
B; B26; B26B; B26B21/00; B26B21/40; B26B21/44; B26B21/443; A; A61; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; A61F6/00; A61F6/02; A61F6/04; A61L; A61L27/00; A61L27/14; A61L27/18; A61L27/28; A61L27/34; A61L29/00; A61L29/08; A61L29/085; A61L33/00; A61L33/06; A61L33/068; B05; B05D; B05D5/00; B05D5/08; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6283; C08J; C08J7/00; C08J7/04; C08J7/043; C08J7/046; C08J7/056; A61M; A61M25/00; A61M25/0043; A61M25/0045; A61M2025/0046; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31554
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
The method of placing on a substrate a hydrophilic coating which has a low coefficient of friction when wetted with a water based liquid comprising: applying to the substrate a solution having from about 0.4% to about 5% (weight to volume). polyisocyanate and from about 0.3% to about 10% (weight to volume). polyurethane, evaporating the solvent, applying a solution having from about 0.5% to about 10% (weight to volume). polyvinylpyrollidone to the thus treated substrate and then evaporating the solvent of the last mentioned solution to form a polyvinyl pyrollidone-polyurethane interpolymer.
Claim 2
Independent Claim
91 words
The method of placing on a substrate a hydrophilic coating which has a low coefficient of friction when wetted with a water based liquid comprising: applying to the substrate a solution having from about 0.4% to about 5% (weight to volume). polyisocyanate and from about 0.3% to about 10% (weight to volume). polyurethane, evaporating the solvent, applying a solution having from about 0.5% to about 10% (weight to volume). polyvinylpyrollidone to the thus treated substrate and then evaporating the solvent of the last mentioned solution to form a polyvinyl pyrollidone-polyurethane interpolymer.
Claim 3
Dependent Claim
15 words
The method in accordance with claim 1 in which the substrate is a polyurethane resin.
Claim 4
Dependent Claim
18 words
The method of claim 1 in which the polyiscoyanate and polyurethane are in solution in methyl ethyl ketone.
Claim 5
Dependent Claim
15 words
The method of claim 1 in which the polyvinylpyrollidone is in solution in ethyl lactate.
Claim 6
Dependent Claim
14 words
The method of claim 1 in which the polyvinylpyrollidone is in solution in chloroform.
Claim 7
Dependent Claim
51 words
The method of claim 1 in which the polyisocyanate is from about 0.4% to about 3% and the polyurethane is from about 0.3% to about 4% (weight to volume) of first mentioned solution and the polyvinylpyrollidone is from about 1% to about 4% (weight to volume) of the second mentioned solution.
Claim 8
Independent Claim
76 words
The method of placing on a polyurethane substrate a hydrophilic coating which has a low coefficient of friction when wetted with a water based liquid comprising: applying to the substrate a solution having from about 0.4% to about 5% (weight to volume) polyisocyanate, evaporating the solvent, applying a solution having from about 0.5% to about 10% (weight to volume) polyvinylpyrollidone to the thus treated substrate and then evaporating the solvent to form a polyvinylpyrollidone polyurethane interpolymer.
Claim 9
Independent Claim
76 words
The method of placing on a polyurethane substrate a hydrophilic coating which has a low coefficient of friction when wetted with a water based liquid comprising: applying to the substrate a solution having from about 0.4% to about 5% (weight to volume) polyisocyanate, evaporating the solvent, applying a solution having from about 0.5% to about 10% (weight to volume) polyvinylpyrollidone to the thus treated substrate and then evaporating the solvent to form a polyvinylpyrollidone polyurethane interpolymer.
Claim 10
Dependent Claim
42 words
The method of claim 7 in which the polyisocyanate is from about 0.4% to about 3% (weight to volume) of the first mentioned solution and the polyvinylpyrollidone is from about 1% to about 4% (weight to volume) of the second mentioned solution.
References Cited (Backward Citations)
US3939049A
Cited
US3860672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |