Patent US2955474A successfully refreshed from Google Patents.
EP0093093B2
Expired / Lapsed
EP
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Preparation of a hydrophilic coating
Assignee: Astra Tech AB
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Filing: 1983-04-07
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Granted: 1991-11-21
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Expires: 2003-04-07
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 Raymond Lambert
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 00:55
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: 8
Claim 1
Independent Claim
175 words
A process for placing on a polymer surface, wherein the polymer is selected from rubber, including latex rubber, vinyl polymers, polyesters and polyacrylates, 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 in an organic solvent which does not react with isocyanate wherein the solute amounts to between 0.05 to 40% (weight to volume) and substantially consists of isocyanate, wherein the isocyanate is selected from 2,4-toluene diisocyanate and 4,4-'-diphenylmethane diisocyanate, or a pentamer of hexamethylene diisocyanate and toluene diisocyanate of cyanurate type, or trimerized hexamethylene diisocyanate biuret, and evaporating the solvent, applying a second solution containing between 0.5 to 50% (weight to volume) of polyvinylpyrrolidone to the thus treated polymer surface and then evaporating the solvent of the second solution, and curing the coating at a temperature of 50 to 100°C in an oven in the presence of a water-containing gas, with the proviso that no polyurethane is present or formed in said polymer or in said coating.
Claim 2
Dependent Claim
175 words
A process for placing on a polymer surface, wherein the polymer is selected from rubber, including latex rubber, vinyl polymers, polyesters and polyacrylates, 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 in an organic solvent which does not react with isocyanate wherein the solute amounts to between 0.05 to 40% (weight to volume) and substantially consists of isocyanate, wherein the isocyanate is selected from 2,4-toluene diisocyanate and 4,4-'-diphenylmethane diisocyanate, or a pentamer of hexamethylene diisocyanate and toluene diisocyanate of cyanurate type, or trimerized hexamethylene diisocyanate biuret, and evaporating the solvent, applying a second solution containing between 0.5 to 50% (weight to volume) of polyvinylpyrrolidone to the thus treated polymer surface and then evaporating the solvent of the second solution, and curing the coating at a temperature of 50 to 100°C in an oven in the presence of a water-containing gas, with the proviso that no polyurethane is present or formed in said polymer or in said coating.
Claim 3
Dependent Claim
28 words
A process according to claim 1, characterized in that the solution of polyvinylpyrrolidone or the solution of isocyanate contains a catalyst that accelerates the curing of the isocyanate.
Claim 4
Dependent Claim
20 words
A process according to claim 2, characterized in that the catalyst comprises an amine, preferably a diamine e.g. triethylene diamine.
Claim 5
Dependent Claim
27 words
A process according to claim 1, characterized in that the polymer surface to be coated comprises a polymer selected from the group consisting of latex and polyvinylchloride.
Claim 6
Dependent Claim
20 words
A process according to claim 1, characterized in that the obtained hydrophilic coating is made antibacterial by treatment with iodine.
Claim 7
Dependent Claim
29 words
Medical article intended for insertion in the body, characterized in that the article is provided with a hydrophilic coating prepared according to claims 1, 2, 3, 4 or 5.
Claim 8
Dependent Claim
13 words
Medical article according to claim 6, characterized in that it comprises a catheter.
References Cited (Backward Citations)
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