US4729914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic coating and substrate coated therewith
Assignee: Tyndale Plains Hunter Ltd
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Filing: 1987-05-22
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Granted: 1988-03-08
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Expires: 2007-05-22
Abstract
Abstract An article having a lower coefficient of friction in the wet state is produced by applying to a substrate an adherent isocyanate coating followed by a second coating of polyvinylpyrrolidone copolymerized with a minor amount of an ethylenic monomer having active hydrogens and curing the so-coated substrate to effect reaction between the active hydrogens and isocyanate groups. The article is useful in the manufacture of medical devices for insertion in the body.
Inventors
- 👤 Charles K. Kliment
- 👤 George E. Seems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; A; A61; A61L; A61L27/00; A61L27/28; A61L27/34; A61L29/00; A61L29/08; A61L29/085; A61L33/00; A61L33/06; A61L33/068; C08G18/08; C08G18/40; C08G18/62; C08G18/6283; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/043; C08J7/046; C08J7/056; C08J2439/00; C08J2439/04; C08J2439/08; C08J2475/00; C08J2475/04; C08J2475/12; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1386; Y10T428/139; Y10T428/1393; Y10T428/31504; Y10T428/31536; Y10T428/31551; Y10T428/31573
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
102 words
An article having thereon a coating which swells in the presence of aqueous media with concomitant reduction in the coefficient of friction, the said article being produced by: applying to a substrate, an adherent coating having free isocyanate groups; applying to the so-coated substrate a second coating of a vinyl copolymer having a major polymeric component derived from N-vinylpyrrolidone and a minor polymeric component derived from an ethylenically unsaturated monomer containing reactive hydrogens, and heating the coated substrate to curing temperatures to effect reaction between the active hydrogens and isocyanate groups thereby chemically binding the copolymer coating to the adherent isocyanate coating.
Claim 2
Dependent Claim
102 words
An article having thereon a coating which swells in the presence of aqueous media with concomitant reduction in the coefficient of friction, the said article being produced by: applying to a substrate, an adherent coating having free isocyanate groups; applying to the so-coated substrate a second coating of a vinyl copolymer having a major polymeric component derived from N-vinylpyrrolidone and a minor polymeric component derived from an ethylenically unsaturated monomer containing reactive hydrogens, and heating the coated substrate to curing temperatures to effect reaction between the active hydrogens and isocyanate groups thereby chemically binding the copolymer coating to the adherent isocyanate coating.
Claim 3
Dependent Claim
26 words
The article of claim 1 wherein the adherent isocyanate coating is a diisocyanate terminated prepolymer produced by reacting a resin having reactive hydrogens with excess diisocyanate.
Claim 4
Dependent Claim
12 words
The article of claim 1 wherein the resin is a polyether polyol.
Claim 5
Dependent Claim
12 words
The article of claim 1 wherein the ethylenic monomer is 2-hydroxyethyl methacrylate.
Claim 6
Dependent Claim
12 words
The article of claim 1 wherein the ethylenic monomer is hydroxypropyl acrylate.
Claim 7
Dependent Claim
12 words
The article of claim 1 wherein the ethylenic monomer is allyl alcohol.
Claim 8
Dependent Claim
11 words
The article of claim 1 wherein the substrate is a polymer.
Claim 9
Dependent Claim
11 words
The article according claim 1 wherein the substrate is a catheter.
Claim 10
Dependent Claim
13 words
The article according to claim 1 wherein the substrate is an implant device.
Claim 11
Dependent Claim
13 words
The article according to claim 1 wherein the substrate is a contact lens.
Claim 12
Dependent Claim
14 words
The article according to claim 1 wherein the substrate is a peristaltic pump chamber.
Claim 13
Dependent Claim
12 words
The article according to claim 1 wherein the substrate is a condom.
Claim 14
Dependent Claim
13 words
The article according to claim 1 wherein the substrate is an arteriovenous shunt.
Claim 15
Dependent Claim
14 words
The article according to claim 1 wherein the substrate is a gastroenteric feed tube.
Claim 16
Dependent Claim
13 words
The article according to claim 1 wherein the substrate is an endotracheal tube.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |