Aqueous dispersion paints and process for making the same

Claim 2

A paint composition having improved wet adhesion consisting essentially of an aqueous dispersion of at least one polymer, from 3% to 20% by weight of said composition of a gloss-improving organic solvent selected from the group consisting of glycols, glycol ethers and glycol esters and a pigment in an amount of 7% to 30% by volume, the polymer of said aqueous dispersion being a copolymer of at least one olefinically unsaturated monomer and from 1 to 5% by weight, based on the weight of the copolymer, of an ethylenically unsaturated acetoacetic acid ester copolymerizable therewith.

Claim 3

A paint composition according, to claim 1 wherein the copolymerizable acetoacetic acid ester is a vinyl acetoacetic acid ester, allyl acetoacetic acid ester or a diester of the formula ##STR6## wherein R is H or CH 3 and A is --(CH 2 ) n --O-- or --(CH 2 --CH 2 ) m --O-- n being an integer of from 1 to 4 and m an integer of from 1 to 3.

Claim 4

A paint composition according to claim 1 wherein the aqueous dispersion contains a mixture of polymers.

Claim 5

A paint composition according to claim 1 wherein the polymer of said aqueous dispersion is a copolymer of: (A) from 5% to 50% by weight relative to the total amount of monomers, of at least one vinyl ester of saturated branched monocarboxylic acid having from 5 to 20 carbon atoms, the carboxyl groups of which are directly linked to a tertiary or quaternary carbon atom, (B) from 40% to 94.5% by weight of an ester selected from the group consisting of vinyl acetate, vinyl propionate, vinyl isobutyrate, and mixtures thereof, (C) from 0 to 30% by weight of other α,β-unsaturated compounds copolymerizable with the foregoing monomers, and (D) from 1 to 5% by weight of an acetoacetic acid ester of the formula ##STR7## wherein X is --O--, --O--CH 2 or ##STR8## and R and R' are H or CH 3 .

Claim 6

A paint composition according to claim 4 wherein the acetoacetic acid ester is the allyl ester.

Claim 7

A paint composition according to claim 1 wherein the polymer of said aqueous dispersion is a copolymer of: (A) from 20 to 80% by weight, based on the total quantity of monomers, of a hardening monomer selected from methyl methacrylate, styrene, vinyl toluene and mixtures thereof, (B) from 20 to 80% by weight of a plasticizing monomer selected from the group consisting of acrylic acid esters carrying in the alcohol radical a linear or branched alkyl radical having from 2 to 8 carbon atoms and conjugated dienes having from 4 to 8 carbon atoms which may be halogenated, (C) from 0.1 to 5% by weight of a monomer selected from the group consisting of acrylic acid, methacrylic acid, acrylamide, methacrylamide and mixtures thereof and (D) from 1 to 5% by weight of an acetoacetic acid ester of the formula ##STR9## wherein R is H or CH 3 , R' is H or CH 3 , and X is --O--, --OCH 2 or ##STR10##

Claim 8

A paint composition according to claim 6 wherein the acetoacetic acid ester is the allyl ester.

Claim 9

A process for the preparation of a dispersion paint having improved wet adhesion which comprises copolymerizing in an aqueous reaction medium (A) 5 to 50% by weight, based on the total weight of monomers, of at least one vinyl ester of a saturated branched monocarboxylic acid having from 5 to 20 carbon atoms, the carboxyl groups of which are directly linked to a tertiary or quaternary carbon atom, (B) 40 to 94.5% by weight of an ester selected from the group consisting of vinyl acetate, vinyl propionate, vinyl isobutyrate and mixtures thereof, (C) 0 to 30% by weight of at least one other α-β-unsaturated compound copolymerizable with the above monomers, and (D) 1 to 5% by weight of an acetoacetic acid ester of the formula ##STR11## wherein X is --O--, --O--CH 2 -- or ##STR12## and R and R' each are H or CH 3 , to form an aqueous plastics dispersion and mixing the dispersion with a gloss-improving solvent selected from the group consisting of glycols, glycol ethers and glycol esters and from 7 to 30% by volume, based on the volume of the dispersion point, of a pigment to form said paint.

Claim 10

A process for the preparation of a dispersion paint having improved wet adhesion which comprises copolymerizing in an aqueous reaction medium (A) 5 to 50% by weight, based on the total weight of monomers, of at least one vinyl ester of a saturated branched monocarboxylic acid having from 5 to 20 carbon atoms, the carboxyl groups of which are directly linked to a tertiary or quaternary carbon atom, (B) 40 to 94.5% by weight of an ester selected from the group consisting of vinyl acetate, vinyl propionate, vinyl isobutyrate and mixtures thereof, (C) 0 to 30% by weight of at least one other α-β-unsaturated compound copolymerizable with the above monomers, and (D) 1 to 5% by weight of an acetoacetic acid ester of the formula ##STR11## wherein X is --O--, --O--CH 2 -- or ##STR12## and R and R' each are H or CH 3 , to form an aqueous plastics dispersion and mixing the dispersion with a gloss-improving solvent selected from the group consisting of glycols, glycol ethers and glycol esters and from 7 to 30% by volume, based on the volume of the dispersion point, of a pigment to form said paint.

Claim 11

A process for the preparation of a dispersion paint having improved wet adhesion which comprises copolymerizing (A) 20 to 80% by weight, based on the total weight of the monomers, of the hardening monomers methyl methacrylate, styrene and vinyl toluene or a mixture thereof, (B) 20 to 80% by weight, based on the total weight of the monomers, of plasticizing monomers selected from the group consisting of acrylic acid esters carrying in the alcohol radical a linear or branched alkyl radical having from 2 to 8 carbon atoms and conjugated dienes having from 4 to 8 carbon atoms which may be substituted by halogen, (C) 0.1 to 5% by weight of acrylic acid, methacrylic acid, acrylamide or methacrylamide, and (D) 1 to 5% by weight of an acetoacetic acid ester of the formula ##STR13## wherein R is H or CH 3 , R' is H or CH 3 , and X is --O--, --OCH 2 or ##STR14## to form an aqueous plastics dispersion and mixing said dispersion with a gloss-improving solvent selected from the group consisting of glycols, glycol ethers and glycol esters and from 7 to 30% by volume, based on the volume of the dispersion paint, of a pigment to form said paint.

Claim 12

A process for the preparation of a dispersion paint having improved wet adhesion which comprises copolymerizing (A) 20 to 80% by weight, based on the total weight of the monomers, of the hardening monomers methyl methacrylate, styrene and vinyl toluene or a mixture thereof, (B) 20 to 80% by weight, based on the total weight of the monomers, of plasticizing monomers selected from the group consisting of acrylic acid esters carrying in the alcohol radical a linear or branched alkyl radical having from 2 to 8 carbon atoms and conjugated dienes having from 4 to 8 carbon atoms which may be substituted by halogen, (C) 0.1 to 5% by weight of acrylic acid, methacrylic acid, acrylamide or methacrylamide, and (D) 1 to 5% by weight of an acetoacetic acid ester of the formula ##STR13## wherein R is H or CH 3 , R' is H or CH 3 , and X is --O--, --OCH 2 or ##STR14## to form an aqueous plastics dispersion and mixing said dispersion with a gloss-improving solvent selected from the group consisting of glycols, glycol ethers and glycol esters and from 7 to 30% by volume, based on the volume of the dispersion paint, of a pigment to form said paint.

Claim 13

The paint composition, as claimed in claim 1, wherein the pigment is contained in an amount of 10 to 20% by volume.

Claim 14

The paint composition, as claimed in claim 1, wherein the solvent is contained in an amount of 5 to 15% by weight of the composition.

Claim 15

The process, as claimed in claim 8 or 9, wherein the pigment is contained in an amount of 10 to 20% by volume.

Claim 16

The process, as claimed in claim 8 or 9, wherein the solvent is contained in an amount of 5 to 15% by weight of the composition.

Claim 17

The paint composition, as claimed in claim 1, wherein the copolymer contains from 1 to 2.91% by weight of said acetoacetic acid ester.

Claim 18

The process, as claimed in claims 8 or 9, wherein the acetoacetic acid ester is contained in an amount of from 1 to 2.91% by weight.

Claim 19

The paint composition, as claimed in claim 1, wherein the copolymer contains from 1 to less than 5.0% by weight of said acetoacetic acid ester.