TH57539B - A thick, aqueous coating mixture containing a polymer binder for film formation. - Google Patents

Abstract

DC60 (17/07/52) A thickened aquifer coating mixture (ideally paints and similar substances or adhesives) containing a polymeric binder for film formation, resulting in a dry coating with reduced water sensitivity, is achieved by using a self-oxidizing thickener. The chosen self-oxidizing moisturizer is prepared using long-chain fatty acids found in alkyd paints, and the mechanism of its combination with the chosen thickener is crucial. These moisturizers may form compounds capable of copolymerization to form a cellulose-free polymer backbone for the thickener. If the compounds are not highly water-soluble, the copolymerization mixture is vigorously agitated to form droplets with an average diameter of less than 500 nm, compensating for this solubility deficiency. The thickener may also act as a binder if used in sufficient quantities. This describes a thickened aquifer coating mixture. (Ideally, this should be a paint and similar substance or adhesive) containing a polymeric binder for film formation, resulting in a dry coating with reduced water sensitivity. This is achieved by using a self-oxidizing thickener. The self-oxidizing fraction of choice is prepared by long-chain fatty acids used in alkyd paints, and the mechanism of agglomeration with the chosen thickener may form compounds that can participate in copolymerization to form a cellulose-free polymer backbone for the thickener. If the compound is not highly soluble in water, the copolymerization mixture is vigorously stirred to form droplets with an average diameter of less than 500 nm, compensating for the lack of solubility. The thickener may also act as a binder if used in sufficient quantities.

Claims (17)

1. A thickened aqueous coating mixture with a selected pH containing a polymer coupling agent and a macromolecular thickener: a) the thickener has a hydrophilic portion at the selected pH, and b) when dispersed in water at a concentration of 2% by weight (based on the total weight of thickener and water), it exhibits a low shear viscosity of at least 0.1 Pascal.s. when measured at 18°C on a Brookfield viscometer using a No. 3 needle at 12 rpm. The macromolecules are cellulose-free and possess a self-oxidizing portion, thus forming a cellulose-free self-oxidizing thickener. 2. A mixture under claim 1 in which the mixture contains a drying agent which accelerates the self-oxidation of the self-oxidizable part. 3. A mixture under either claim 1 or claim 2 in which the self-oxidizing fraction is prepared by unsaturated long-chain fatty acids. 4. Any mixture under claims 1 through 3 in which the self-oxidizing portion is prepared by a diester synthesized into a copolymer incorporating a divalent hydroxypropylene group. 5. Any mixture under claims 1 through 3 in which the self-oxidizing fraction is prepared by a synthetic diester copolymer incorporating a divalent radical of a polyether. 6. Any mixture under claims 1 through 5 in which the macromolecule contains styrene synthesized as a copolymer or styrene with similar function. 7. A mixture under any of the claims 1 through 6 in which the mixture contains polyunsaturated compounds. 8. A mixture pursuant to claim 7, which contains polyunsaturated polybutadiene. 9. A mixture under any of the preceding claims in which the mixture contains more than 3% by weight of thickener (based on the total weight of the mixture). 10. Any mixture under claims 1 through 8 in which the mixture contains a thickener up to 3% by weight (based on the total weight of the mixture). 11. Any mixture under claims 1 through 8 in which the mixture contains less than 3% solid material by volume. 12. A process for the manufacture of coating compounds as claimed in any of the claims 1 through 11, in which the thickener is produced by the vigorous stirring of a co-monomer derived from a polymer core. 13. Architectural paints, lacquers, varnishes, wood stains, or adhesives containing any of the coating compounds as claimed in Rights 1 through 11, or manufactured in accordance with Rights 12, and containing more than 3% by weight of thickeners. 14. An aqueous thickener dispersion at a selected pH for use in coating compounds a) in which the thickener has a selectively hydrophilic molecular portion, and b) in which the thickener, when dispersed in water at a concentration of 2% by weight (based on the total weight of thickener and water combined), exhibits a low shear viscosity of at least 0.1 Pascal.s. when measured at 18°C on a Brookfield viscometer using a No. 3 needle at 12 rpm, in which the macromolecules are cellulose-free and contain a self-oxidizing portion, thus forming a cellulose-free self-oxidizing thickener. 15. A dispersion according to claim 14 in which, under the unneutralized conditions, the particles have a number average particle size of less than 500 nanometers. 16. Any mixture under claims 1 through 11 or 13 in which a polymer binder and a cellulose-free macromolecular thickener are composed of the same material. 17. Any mixture under claims 1 through 11 or 13, in which the dry coating obtained from such mixture contains at least 70% PVC.