Articles coated with synergistic anti-fog coatings based on hydrophillic polymers and organosiloxane- oxyalkylene block copolymers

• US 3,933,407 A
• Filed: 06/28/1973
• Issued: 01/20/1976
• Est. Priority Date: 06/29/1972
• Status: Expired due to Term

• Current Assignee: John J. Shields, Robert S. Tu
• Original Assignee: John J. Shields, Robert S. Tu
• Inventors: Shields, John J., Tu, Robert S.
• Primary Examiner(s): Martin, William D.
• Assistant Examiner(s): Schmidt, William H.
• Application Number:
  US05/374,784
• Time in Patent Office: 936 Days
• Field of Search: 117/124 E, 117/124 F, 117/138.8 E, 117/138.8 F, 117/138.8 UA, 117/145, 260/827, 106/13, 350/61, 350/175 R, 350/288, 350/319, 229/1.5 B, 215/12 R, 428/412, 428/429, 428/442, 428/447, 428/483, 428/510, 428/516, 428/520
• US Class Current: 359/507
• CPC Class Codes: C03C 17/32 with synthetic or natural resins C03C17/30 takes precedence
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 83/12 containing polyether sequences
• CPC Class Codes: C09D 133/04 Homopolymers or copolymers of esters C09D143/04 takes precedence
• CPC Class Codes: C09D 133/24 Homopolymers or copolymers of amides or imides
• 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
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31891 Where addition polymer is an ester or halide
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer
• CPC Class Codes: Y10T 428/31928 Ester, halide or nitrile of addition polymer

Abstract

Synergistic antifogging action is observed by applying a combination of (1) a hydroxyalkyl acrylate or methacrylate or the like and (2) an organosiloxane-oxyalkylene block copolymer to a glass or plastic surface which is normally fogging.

Claims

1. A normally fogging transparent or reflecting substrate having on at least one surface thereof a non-fogging water insoluble hydrophilic coating comprising:

(1) a hydrophilic acrylate or methacrylate polymer selected from the group consisting of polymers of hydroxy lower alkyl acrylates, hydroxy lower alkyl methacrylates, hydroxy lower alkoxy lower alkyl acrylates and hydroxy lower alkoxy lower alkyl methacrylates and (2) in an amount sufficient to synergistically improve the anti-fog activity of the hydrophilic polymeric compound of an organo-siloxane-oxyalkylene block copolymer comprising (a) at least one siloxane block containing at least two siloxane units represented by the formula;

space="preserve" listing-type="equation">R.sub.b SiO.sub.(4.sub.-b) /2

whrein R contains from one to about 20 carbon atoms and is selected from the group consisting of monovalent hydrocarbon groups, halogen-substituted monovalent hydrocarbon groups, and divalent hydrocarbon groups and b has a value from 1 to 3 inclusive, said siloxane block containing at least one of said siloxane units wherein at least one R group is a divalent hydrocarbon group, and (b) at least one oxyalkylene block containing at least four oxyalkylene groups represented by the formula--R'"'"'O--, wherein R'"'"' is an alkylene group containing from two to about 10 carbon atoms, said siloxane oxyalkylene blocks being interconnected by said divalent hydrocarbon group.

2. A substrate according to claim 1 wherein the hydrophilic polymer is a polymer of hydroxyethyl methacrylate.

3. A substrate according to claim 1 wherein the organosiloxane-oxyalkylene block copolymer is 0.05-5% of the hydrophilic polymer.

4. A substrate according to claim 3 wherein the substrate is glass.

5. A substrate according to claim 3 which is a polycarbonate.

6. A substrate according to claim 3 which is polyethylene or polypropylene.

7. A substrate according to claim 6 which is irradiated polyethylene.

8. A substrate according to claim 3 wherein the substrate is an organic plastic.

9. A substrate according to claim 8 wherein the organic substrate is selected from the group consisting of polymerized methyl methacrylate, polycarbonate, cellulose acetate, cellulose propionate, cellulose acetate-propionate, biaxially oriented polyethylene, biaxially oriented irradiated polyethylene, biaxially oriented polypropylene, biaxially oriented polystyrene, biaxially oriented styrene-acrylonitrile copolymer, biaxially oriented polyethylene terephthalates, biaxially oriented vinyl chloride polymer, biaxially oriented vinylidene chloride polymer, quench chilled polyethylene and quench chilled polypropylene.

10. A substrate according to claim 1 which is a lens.

11. A substrate according to claim 1 which is a window.

12. A substrate according to claim 1 which is a mirror.

13. A substrate according to claim 1 which is a drinking glass.

14. A substrate according to claim1 wherein the coating consists essentially of said hydrophilic polymer and said organosiloxane-oxyalkylene block copolymer.