Radiation-curing aqueous coatings providing a nonadherent surface

• US 4,127,460 A
• Filed: 10/27/1976
• Issued: 11/28/1978
• Est. Priority Date: 10/27/1976
• Status: Expired due to Term

• Current Assignee: DSM Resins BV (DSM-Firmenich AG)
• Original Assignee: DeSoto, Inc. (Overstock.com Incorporated)
• Inventors: Gaske, Joseph E., England, George J., Packer, Eugene S.
• Primary Examiner(s): Rzucidlo, Eugene C.
• Application Number:
  US05/735,970
• Time in Patent Office: 762 Days
• Field of Search: 260/29.2 M, 260/29.6 NR, 260/29.1 SB, 204/159.13, 204/159.16, 204/159.18, 204/159.23
• US Class Current: 522/84
• CPC Class Codes: C08F 220/00 Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
• CPC Class Codes: C08K 5/17 Amines; Quaternary ammonium compounds
• CPC Class Codes: C08L 2666/36 Nitrogen-containing compounds
• CPC Class Codes: C08L 33/14 of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: C09D 183/04 Polysiloxanes
• CPC Class Codes: C09D 4/00 Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
• CPC Class Codes: G03F 7/0757 Macromolecular compounds containing Si-O, Si-C or Si-N bonds G03F7/0752 takes precedence

Abstract

A radiation-curable aqueous emulsion coating composition which cures to provide a nonadherent surface is provided by emulsifying droplets of liquid alkyl hydrogen polysiloxane in water, the water having dispersed therein a radiation-curable polyethylenically unsaturated tertiary amine, such as an amine polyacrylate, at least partially neutralized with a solubilizing acid. The aqueous emulsion preferably includes a photosensitizer rendering the composition curable with ultraviolet light.

Claims

1. An ultraviolet-curable aqueous emulsion coating composition which cures to provide a nonadherent surface comprising water having emulsified therein from about 2 to about 50 weight percent, based on total resin solids, of droplets of liquid alkyl hydrogen polysiloxane having the formula:

##STR3## where n is a number from 4-30, R is an alkyl group containing from 1 to 4 carbon atoms, and the ratio of alkyl groups to hydrogen groups is from 1;

2 to 2;

1, said water having emulsified therein a liquid polyacrylate tertiary amine having a viscosity of at least 200 centipoises reacted with a solubilizing acid to produce a quaternary ammonium salt which disperses in water in the form of an emulsion having a pH in the range of 5.0-8.5, said aqueous emulsion including a photosensitizer rendering said composition curable with ultraviolet light.

2. An aqueous emulsion coating composition as recited in claim 1 in which said polysiloxane is a methyl hydrogen polysiloxane present in an amount of 4-30 weight percent, said polyacrylate tertiary amine is the reaction products of a polyacrylate containing from 2-4 acrylate groups per molecule with from 0.2-1.2 equivalents of amine per mole of polyacrylate.

3. An aqueous emulsion coating composition as recited in claim 2 in which a ketonic photosensitizer is used and said emulsion is free of volatilizable components other than water.

4. An aqueous emulsion coating composition as recited in claim 1 in which said emulsion is free of volatilizable components other than water.

5. An aqueous emulsion coating composition as recited in claim 1 in which said polysiloxane is a methyl hydrogen polysiloxane.

6. An aqueous emulsion coating composition as recited in claim 1 in which said polyethylenically unsaturated tertiary amine is a liquid polyacrylate containing from 2-4 acrylate groups per molecule reacted with at least 0.05 equivalent of amine per mole of polyacrylate, and said liquid alkyl hydrogen polysiloxane is present in an amount of from about 4 to about 30 weight percent based on total resin solids.

7. An aqueous emulsion coating composition as recited claim 6 in which said polyacrylate is reacted with from 0.2-1.2 equivalents of amine per mole of polyacrylate.

8. An aqueous emulsion coating composition as recited in claim 1 in which said polyethylenically unsaturated tertiary amine, after solubilization with said solubilizing acid, has a viscosity of at least 500 centipoises.

9. An aqueous emulsion coating composition as recited in claim 8 in which said viscosity is in the range of 6-50 poise.

10. An ultraviolet-curable aqueous emulsion coating composition which cures to provide a nonadherent surface comprising water having emulsified therein from 4-30 weight percent, based on total resin solids, of droplets of liquid alkyl hydrogen polysiloxane having the formula:

##STR4## where n is a number from 4-30, R is an alkyl group containing from 1 to 4 carbon atoms, and the ratio of alkyl groups to hydrogen groups is from 1;

2 to 2;

1, said water having emulsified therein a liquid polyacrylate tertiary amine which is the reaction product of a polyacrylate containing from 2-4 acrylate groups per molecule with from 0.2-1.2 equivalents of amine per mole of polyacrylate, said polyacrylate tertiary amine having a viscosity in the range of 6-50 poise and being reacted with a solubilizing acid to produce a quaternary ammonium salt which disperses in water in the form of an emulsion, said aqueous emulsion including a photosensitizer rendering said composition curable with ultraviolet light.