Transparent anti-fog coating compositions

• US 4,467,073 A
• Filed: 10/20/1982
• Issued: 08/21/1984
• Est. Priority Date: 10/20/1982
• Status: Expired due to Term

• Current Assignee: Xomed Surgical Products, Inc. (Medtronic Plc)
• Original Assignee: Hydromer, Inc.
• Inventors: Creasy, Walter S.
• Primary Examiner(s): Morris, Theodore
• Assistant Examiner(s): SELLERS, ROBERT E
• Application Number:
  US06/435,461
• Time in Patent Office: 671 Days
• Field of Search: 525/127, 525/123
• US Class Current: 525/127
• CPC Class Codes: C08F 120/56 Acrylamide; Methacrylamide
• CPC Class Codes: C08F 126/10 N-Vinyl-pyrrolidone
• CPC Class Codes: C08F 226/10 N-Vinyl-pyrrolidone
• CPC Class Codes: C08F 8/30 Introducing nitrogen atoms or nitrogen-containing groups
• CPC Class Codes: C08F 8/32 by reaction with amines
• CPC Class Codes: C08G 18/6283 Polymers of nitrogen containing compounds having carbon-to-carbon double bonds C08G18/6262, C08G18/6266 take precedence
• CPC Class Codes: C09K 3/18 for application to surfaces to minimize adherence of ice, mist or water thereto rendering particulate materials free flowing, in general, e.g. making them hydrophobic B01J2/30; Thawing or antifreeze materials for application to surfaces used in liquids for heat-transfer, heat-exchange or heat-storage or for the production of heat or cold other than by combustion, e.g. radiator liquids, C09K5/00

Abstract

An anti-fog liquid coating composition comprises: a polymer which is polyvinylpyrrolidone, polydimethylacrylamide or a polyvinylpyrrolidone copolymer with a polymerizable alpha olefin free of functional groups reactive with isocyanates; a polyisocyanate prepolymer; a surfactant which will chemically bond to a reaction product of the polymer and prepolymer, and an organic solvent to form a solution of the foregoing ingredients.

The invention includes a substrate having an anti-fog transparent coating comprising the reaction product of polyvinylpyrrolidione, a polyvinylpyrrolidone copolymer with a polymerizable alpha olefin free of functional groups reactive with isocyanates or polydimethylacrylamide with a polyisocyanate prepolymer, said reaction product being chemically bound to a surfactant.

On curing, the surfactant is chemically combined with the hydrophilic polymer/isocyanate prepolymer composition and is not subject to extraction in any significant amount while still conferring improved fog resistance to the coated substrate.

Claims

1. An anti-fog liquid coating composition comprising:

a polymer which is polyvinylpyrrolidone, a polyvinylpyrrolidone copolymer with a polymerizable alpha olefin free of functional groups reactive with isocyanates or polydimethylacrylamide,

a polyisocyanate prepolymer,

a surfactant which will bond to a reaction product of the polymer and prepolymer, and

an organic solvent to form a solution of the foregoing ingredients.

2. A coating composition in accordance with claim 1 in which the surfactant is ionic and complexes with a reaction product of the polymer and prepolymer.

3. A coating composition in accordance with claim 1 in which the surfactant is nonionic and reacts with a reaction product of the polymer and prepolymer.

4. A coating composition in accordance with claim 1 in which the surfactant is a combination of an ionic surfactant which complexes with a reaction product of the polymer and prepolymer and a nonionic surfactant which reacts with said reaction product.

5. A coating composition in accordance with any of claims 1, 2, 3 or 4 in which the ratio of the weight of the polymer to the weight of the isocyanate in the prepolymer is in the range of from about 10 to 1 to about 3 to 1.

6. A coating composition in accordance with any of claims 1, 2, 3 or 4 in which the ratio of the weight of the polymer to the weight of the isocyanate in the prepolymer is in the range of from about 10 to 1 to about 3 to 1 and the surfactant is present in an amount by weight of from about 0.1% to about 40% of the combined weights of the polymer and copolymer.

7. A coating composition in accordance with any of claims 1, 2, 3 or 4 in which the ratio of the weight of the polymer to the weight of the isocyanate in the prepolymer is in the range of from about 10 to 1 to about 3 to 1 and the surfactant is present in an amount by weight of from about 5% to about 25% of the combined weights of the polymer and copolymer.

8. A substrate,

an anti-fog transparent coating on the substrate comprising the reaction product of a polymer of the group consisting of polyvinylpyrrolidone, a polyvinylpyrrolidone copolymer with a polymerizable alpha olefin free of functional groups reactive with isocyanates, or polydimethylacrylamide with a polyisocyanate prepolymer chemically bonded to a surfactant.

9. The combination of claim 8 in which the surfactant is ionic and is complexed with the reaction product.

10. The combination of claim 8 in which the surfactant is nonionic and is reacted with the reaction product.

11. The combination of claim 8 in which the surfacant is a combination of an ionic surfactant complexed with the reaction product and a nonionic surfactant reacted with the reaction product.

12. The combination of any of claims 8, 9, 10 or 11 in which the ratio of the weight of the polymer to the weight of the isocyanate in the prepolymer is in the range of from about 10 to 1 to about 3 to 1.

13. The combination of any of claims 8, 9, 10 or 11 in which the ratio of the weight of the polymer to the weight of the isocyanate in the prepolymer is in the range of from about 10 to 1 to about 3 to 1 and the surfactant is present in an amount by weight of from about 0.1% to about 40% of the combined weights of the polymer and copolymer.

14. The combination of any of claims 8, 9, 10 or 11 in which the ratio of the weight of the polymer to the weight of the isocyanate in the prepolymer is in the range of from about 10 to 1 to about 3 to 1 and the surfactant is present in an amount by weight of from about 5% to about 25% of the combined weights of the polymer and copolymer.