US4459317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of a hydrophilic coating
Assignee: Astra Tech AB
•
Filing: 1983-04-21
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Granted: 1984-07-10
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Expires: 2003-04-21
Abstract
Abstract A process for coating a polymer surface with a hydrophilic coating with low friction in wet condition. The process comprises applying to the polymer surface a solution containing between 0.05 to 40% of a compound which comprises at least two unreacted isocyanate groups per molecule, evaporating the solvent, applying a solution containing between 0.05 to 50% of polyethylene oxide to the thus treated polymer surface and then evaporating the solvent of the last mentioned solution, and curing the coating at elevated temperature. The process is preferably carried out in the presence of a catalyst for the curing of isocyanate.
Inventors
- 👤 Hans R. Lambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:47
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/08; A61L29/085; C; C08; C08J; C08J7/00; C08J7/04; C08J7/043; C08J7/046; C08J7/056; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31536; Y10T428/31551; Y10T428/31573; Y10T428/3158
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A process for placing on a polymer surface a hydrophilic coating which has a low coefficient of friction when wetted with a water based liquid which comprises: applying to the polymer surface a solution containing between 0.05 to 40% (weight to volume) of a compound which comprises at least two unreacted isocyanate groups per molecule, evaporating the solvent, applying a solution containing between 0.5 to 50% (weight to volume) of polyethylene oxide having a mean molecular weight of between 10 4 to 10 -7 to the thus treated polymer surface and then evaporating the solvent of the second solution, and curing the coating at elevated temperature.
Claim 2
Dependent Claim
106 words
A process for placing on a polymer surface a hydrophilic coating which has a low coefficient of friction when wetted with a water based liquid which comprises: applying to the polymer surface a solution containing between 0.05 to 40% (weight to volume) of a compound which comprises at least two unreacted isocyanate groups per molecule, evaporating the solvent, applying a solution containing between 0.5 to 50% (weight to volume) of polyethylene oxide having a mean molecular weight of between 10 4 to 10 -7 to the thus treated polymer surface and then evaporating the solvent of the second solution, and curing the coating at elevated temperature.
Claim 3
Dependent Claim
27 words
A process according to claim 1 wherein the solution of polyethylene oxide or the solution of isocyanate contains a catalyst that accelerates the curing of the isocyanate.
Claim 4
Dependent Claim
12 words
A process according to claim 2 wherein the catalyst comprises an amine.
Claim 5
Dependent Claim
16 words
A process according to claims 1, 2 or 3 wherein the isocyanate solution contains a polymer.
Claim 6
Dependent Claim
28 words
A process according to claim 4 wherein the polymer in the isocyanate solution is selected from the group consisting of polyesters, polyvinyl compounds, polyurethanes, polyisocyanates, or copolymers thereof.
Claim 7
Dependent Claim
18 words
A process according to claim 1 wherein the curing is performed in the presence of a water-containing gas.
Claim 8
Dependent Claim
26 words
A process according to claim 1 wherein the polymer surface to be coated comprises a polymer selected from the group consisting of latex, polyvinylchloride, and polyurethane.
Claim 9
Dependent Claim
14 words
A process according to claim 1 wherein the hydrophilic coating is treated with iodine.
References Cited (Backward Citations)
GB1600963A
Cited
US4232608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |