Fast Drying Waterborne Coatings
AssigneeLubrizol Advanced Materials, Inc.
InventorsShui-Jen R. Hsu, Dominic Cremona, Darlene D. Rota, Adlai J. Perry, Keith Rawlins
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Abstract
Coating and ink formulations are disclosed that are comprised of an anionically colloidally stabilized copolymer dispersion, a polyamine additive that can react with anionic groups, and a volatile base that can help shift the pH of the copolymer dispersion early in the drying process of films or coatings from the copolymer dispersion. The formulations are used in construction and roof coatings.
Claims22
A polymer dispersion in aqueous media comprising:
- a) 10 to 75 wt. % of an anionically colloidally stabilized copolymer dispersion in an aqueous media having a number average particle size via light scattering methods of from 50 to 2000 nanometers in an aqueous media,
- b) 0.1 to 10 wt. % of a water dilutable polyamine additive comprising repeating units from the polymerization product of unsaturated monomers, wherein
- (1) about 30-90 wt. % of repeating units are from a free radically polymerizable tertiary amine monomer selected from the group consisting of formula A1 and A2
- wherein Ra is O or NRk, Rb is a C1 to C6 alkylene, Re is a C1-C4 alkyl, Rf is a C1-C4 alkyl, Rg is H or methyl or ethyl and Rh is H or methyl or ethyl, Rk is H, a C1-C4 alkyl, or a C1-C4 acyl group, A′ is poly(oxy-C2H4 and/or C3H6 alkylene) homopolymer or copolymer of number average molecular weight of 88-348 g/mole, m is 2 or 3, Ri is selected from a group comprising hydrogen, phenyl group, benzyl group, and a C1-C12 alkyl group if it is not linked directly to Rj to form an alkylene group, Rj is selected from a group comprising hydrogen, a C1-C4 alkyl group, if it is not linked directly to Ri, and optionally Ri and Rj together are covalently bonded to each other to form a C4 or C5 alkylene group forming a five or 6 membered ring with the C atom to which they are attached, with
- (2) about 10-60 wt. % of repeating units are from polymerizable alkylene oxide monomer B of the formula
- wherein Rp is a poly(alkylene oxide) of number average molecular weight from about 88 to about 1200, wherein said poly(alkylene oxide) oxide has 2 or 3 or 4 carbons per alkylene group, Rq is H or C1-C5 alkylene group;
- and Rr is H or methyl or ethyl;
- and
- (3) about 0 to about 60 wt. % of the repeating units are from other free radically polymerizable monomers other than monomers A1, A2 and B, and
- wherein the pH of said polymer dispersion is between 7.5 and 12.5.
A method of imparting water resistance to a coating composition comprising adding a water dilutable polyamine additive to the coating composition, wherein the coating composition comprises an anionically stabilized polymer dispersion, wherein said water dilutable polyamine comprises repeating units from the polymerization product of unsaturated monomers, wherein
- a) about 30-90 wt. % of repeating units are from a free radically polymerizable tertiary amine monomer selected from the group consisting of formula A1 and A2
- wherein Ra is O or NRk, Rb is a C1 to C6 alkylene, Re is a C1-C4 alkyl, Rf is a C1-C4 alkyl, Rg is H or methyl or ethyl and Rh is H or methyl or ethyl, Rk is H, a C1-C4 alkyl, or a C1-C4 acyl group, A′ is poly(oxy-C2H4 and/or C3H6 alkylene) homopolymer or copolymer of number average molecular weight of 88-348 g/mole, m is 2 or 3, Ri is selected from a group comprising hydrogen, phenyl group, benzyl group, and a C1-C12 alkyl group if it is not linked directly to Rj to form an alkylene group, Rj is selected from a group comprising hydrogen, a C1-C4 alkyl group, if it is not linked directly to Ri, and optionally Ri and Rj together are covalently bonded to each other to form a C4 or C5 alkylene group forming a five or 6 membered ring with the C atom to which they are attached, with
- b) about 10-60 wt. % of repeating units are from polymerizable alkylene oxide monomer B of the formula
- wherein Rp is a poly(alkylene oxide) of number average molecular weight from about 88 to about 1200, wherein said poly(alkylene oxide) has 2 or 3 or 4 carbons per alkylene group, Rq is H or C1-C5 alkylene group;
- and Rr is H or methyl or ethyl;
- and
- c) about 0 to about 60 wt. % of the repeating units are from other free radically polymerizable monomers other than monomers A1, A2 and B, and
- wherein said polyamine imparts into said coating composition earlier water resistance after film formation by said coating composition by including said polyamine additive into said coating composition and homogenizing the polyamine into said coating composition.
A method for enhancing the development of water resistance in a coating composition formed into a film on a substrate, said method comprising incorporating a water dilutable polyamine into said coating composition prior to forming said film and while the coating composition has a pH of 9.5 or higher, thereafter maintaining the pH of said coating composition at pH 9.5 or higher until said coating composition is formed into a film on a substrate, and after forming a film on a substrate, allowing the pH of said film on said substrate to fall below pH 9 by volatilization of one or more pH basic components from said coating composition;
- wherein the coating composition comprises an anionically stabilized polymer dispersion;
- wherein said water dilutable polyamine comprises repeating units from the polymerization product of unsaturated monomers, wherein
- a) about 30-90 wt. % of repeating units are from a free radically polymerizable tertiary amine monomer selected from the group consisting of formula A1 and A2
- wherein Ra is O or NRk, Rb is a C1 to C6 alkylene, Re is a C1-C4 alkyl, Rf is a C1-C4 alkyl, Rg is H or methyl or ethyl and Rh is H or methyl or ethyl, Rk is H, a C1-C4 alkyl, or a C1-C4 acyl group, A′ is poly(oxy-C2H4 and/or C3H6 alkylene) homopolymer or copolymer of number average molecular weight of 88-348 g/mole, m is 2 or 3, Ri is selected from a group comprising hydrogen, phenyl group, benzyl group, and a C1-C12 alkyl group if it is not linked directly to Rj to form an alkylene group, Rj is selected from a group comprising hydrogen, a C1-C4 alkyl group, if it is not linked directly to Ri, and optionally Ri and Rj together are covalently bonded to each other to form a C4 or C5 alkylene group forming a five or 6 membered ring with the C atom to which they are attached, with
- b) about 10-60 wt. % of repeating units are from polymerizable alkylene oxide monomer B of the formula
- wherein Rp is a poly(alkylene oxide) of number average molecular weight from about 88 to about 1200, wherein said poly(alkylene oxide) has 2 or 3 or 4 carbons per alkylene group, Rq is H or C1-C5 alkylene group;
- and Rr is H or methyl or ethyl;
- and
- about 0 to about 60 wt. % of the repeating units are from other free radically polymerizable monomers other than monomers A1, A2 and B.
Dependencies are inferred from the claim text.