EP0093093A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Preparation of a hydrophilic coating
Assignee: Astra Tech AB
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Filing: 1983-04-07
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Granted: —
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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
2026-10-23 16:57
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
95 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 comprising: 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 polyvinylpyrrolidone to the thus treated polymer surface and then evaporating the solvent of the last mentioned solution, and curing the coating at elevated temperature.
Claim 2
Dependent Claim
95 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 comprising: 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 polyvinylpyrrolidone to the thus treated polymer surface and then evaporating the solvent of the last mentioned solution, and curing the coating at elevated temperature.
Claim 3
Dependent Claim
28 words
A process according to claim 1 characterized by 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 by that the catalyst comprises an amine, preferably a diamine or triethylene diamine.
Claim 5
Dependent Claim
28 words
A process according to claims 1-3 characterized by that the isocyanate solution contains a polymer intended to reduce the diffusion of isocyanate before the curing of the coating.
Claim 6
Dependent Claim
31 words
A process according to claim 4 characterized by that the polymer in the isocyanate solution is selected from the group consisting of polyesters, polyvinyl compounds, polyurethanes, polyisocyanates, or copolymers of these.
Claim 7
Dependent Claim
21 words
A process according to claim 1 characterized by that the concluding curing is performed in the presence of a water-containing gas.
Claim 8
Dependent Claim
28 words
A process according to claim 1 characterized by that the polymer surface to be coated comprises a polymer selected from the group consisting of latex, polyvinylchloride, and polyurethane.
Claim 9
Dependent Claim
20 words
A process according to claim 1 characterized by that the obtained hydrophilic coating is made antibacterial by treatment with iodine.
Claim 10
Dependent Claim
24 words
Medical article intended for insertion in the body characterized by that the article is provided with a hydrophilic coating prepared according to claims 1-8.
Claim 11
Dependent Claim
13 words
Medical article according to claim 9 characterized by that it comprises a catheter.
References Cited (Backward Citations)
GB1600963A
Cited
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