US4666437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic coating
Assignee: Astra Tech AB
•
Filing: 1986-03-05
•
Granted: 1987-05-19
•
Expires: 2006-03-05
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 0.5 to 50 % of polyvinylpyrrolidone 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 00:54
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/08; A61L29/085; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6283; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08J7/056; C08J2439/00; C08J2439/04; C08J2439/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31565; Y10T428/31573; Y10T428/31576
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
162 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 consists essentially of applying a solution to the surface of an article made from a polymer selected from the group consisting of rubber, vinyl polymers, polyesters and polyacrylates, which solution consists essentially of an organic solvent and a solute in an amount of between 0.05 to 40% (weight to volume), said solute consisting essentially of an isocyanate monomer having at least 2 unreacted isocyanate groups per molecule, an isocyanate prepolymer thereof having up to 5 monomer units, or a mixture of such monomers and prepolymers, evaporating the solvent, applying a second solution consisting essentially of a solvent containing between 0.5 to 10% (weight to volume) of polyvinyl pyrrolidone to the thus treated polymer surface, and then evaporating the solvent of the second solution and curing the coating in the presence of a water-containing gas at elevated temperature.
Claim 2
Dependent Claim
162 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 consists essentially of applying a solution to the surface of an article made from a polymer selected from the group consisting of rubber, vinyl polymers, polyesters and polyacrylates, which solution consists essentially of an organic solvent and a solute in an amount of between 0.05 to 40% (weight to volume), said solute consisting essentially of an isocyanate monomer having at least 2 unreacted isocyanate groups per molecule, an isocyanate prepolymer thereof having up to 5 monomer units, or a mixture of such monomers and prepolymers, evaporating the solvent, applying a second solution consisting essentially of a solvent containing between 0.5 to 10% (weight to volume) of polyvinyl pyrrolidone to the thus treated polymer surface, and then evaporating the solvent of the second solution and curing the coating in the presence of a water-containing gas at elevated temperature.
Claim 3
Dependent Claim
23 words
A process according to claim 1 wherein the isocyanate is selected from the group consisting of toluene diisocyanate, hexamethylene diisocyanate and 4,4'-diphenyl-methane diisocyanate.
Claim 4
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 rubber and polyvinylchloride.
Claim 5
Dependent Claim
14 words
A process according to claim 2 wherein the hydrophilic coating is treated with iodine.
Claim 6
Dependent Claim
159 words
A medical article for insertion in the body which is provided with a hydrophilic coating prepared in accordance with a process which consists essentially of applying a solution to the surface of an article made from a polymer selected from the group consisting of rubber, vinyl polymers, polyesters and polyacrylates, which solution consists essentially of an organic solvent and a solute in an amount of between 0.05 to 40% (weight to volume), said solute consisting essentially of an isocyanate monomer having at least 2 unreacted isocyanate groups per molecule, an isocyanate prepolymer thereof having up to 5 monomer units, or a mixture of such monomers and prepolymers, evaporating the solvent, applying a second solution consisting essentially of a solvent containing between 0.5 to 10% (weight to volume) of polyvinyl pyrrolidone to the thus treated polymer surface, and then evaporating the solvent of the second solution and curing the coating in the presence of a water-containing gas at elevated temperature.
Claim 7
Dependent Claim
159 words
A medical article for insertion in the body which is provided with a hydrophilic coating prepared in accordance with a process which consists essentially of applying a solution to the surface of an article made from a polymer selected from the group consisting of rubber, vinyl polymers, polyesters and polyacrylates, which solution consists essentially of an organic solvent and a solute in an amount of between 0.05 to 40% (weight to volume), said solute consisting essentially of an isocyanate monomer having at least 2 unreacted isocyanate groups per molecule, an isocyanate prepolymer thereof having up to 5 monomer units, or a mixture of such monomers and prepolymers, evaporating the solvent, applying a second solution consisting essentially of a solvent containing between 0.5 to 10% (weight to volume) of polyvinyl pyrrolidone to the thus treated polymer surface, and then evaporating the solvent of the second solution and curing the coating in the presence of a water-containing gas at elevated temperature.
Claim 8
Dependent Claim
24 words
A medical article according to claim 5 wherein the isocyanate is selected from the group consisting of toluene diisocyanate, hexamethylene diisocyanate and 4,4'-diphenylmethane diisocyanate.
Claim 9
Dependent Claim
27 words
A medical article according to claim 5 wherein the polymer surface to be coated comprises a polymer selected from the group consisting of latex rubber and polyvinylchloride.
Claim 10
Dependent Claim
15 words
A medical article according to claim 6 wherein the hydrophilic coating is treated with iodine.
Claim 11
Dependent Claim
15 words
A medical article according to claims 5, 6, 7 or 8 which comprises a catheter.
References Cited (Backward Citations)
US3005728A
Cited
US3023126A
Cited
US3216983A
Cited
US3198692A
Cited
US3661634A
Cited
US4128600A
Cited
US4100309A
Cited
US4119094A
Cited
US4373009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |