Method to increase resistance against stain penetration of aqueous coating compositions
First Claim
1. A method for making an aqueous coating composition, which confers stain and penetration resistance when applied to a substrate and dried and/or cured, comprising mixing together at least one pigment, at least one film-forming polymer in the form of an aqueous polymer dispersion, and at least one anionic surfactant of formula (Ia), to obtain the aqueous coating composition;
- wherein said aqueous coating composition comprises;
at least one pigment, an aqueous polymer dispersion containing at least one film-forming polymer, and at least one anionic surfactant (S) of formula (Ia);
wherein the at least one film-forming polymer, in polymerized form, consists of;
(M1a) 40 to 59.4% by weight of methyl methacrylate or a mixture thereof with styrene,(M1b) 40 to 55% by weight of at least one C2-C10 alkyl ester of acrylic acid,(M2) 0.1 to 3% by weight of itaconic acid, acrylic acid, methacrylic acid, or a mixture thereof,(M3a) 0.5 to 3% by weight of acrylamide, methacrylamide, hydroxyethyl acrylate, or a mixture thereof, and(M3b) 0 to 2% by weight of N-(2-methacryloxyethyl) imidazolin-2-one,provided that a total amount of (M1a), (M1b), (M2), (M3a), and (M3b) is 100% by weight and a total amount of (M2), (M3a), and (M3b) is from 0.7 to 5% by weight, based on the total amount of (M1a), (M1b), (M2), (M3a), and (M3b); and
wherein the at least one surfactant (S) is of formula (Ia);
M3-n[O4-nP—
(O-(Alk-O)mR)n]
(Ia),whereinn is 1 or 2,m is an integer from 0 to 15,M is hydrogen, an alkali metal ion, or an ammonium ion,Alk is C2-C3-alkylene, andR is C8-C30 alkyl or C4-C30 alkylphenyl;
wherein a weight ratio of the at least one pigment to the at least one film-forming polymer ranges from 4;
1 to 1;
5; and
wherein the amount of the at least one surfactant (S) of formula (Ia) constitutes at least 85% of the total amount by weight of anionic surfactants in the aqueous coating composition.
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Abstract
The invention also relates to a method to increase stain resistance and penetration resistance of aqueous coating compositions which method comprises providing a coating composition which contain at least one pigment, at least one film-forming polymer in the form of an aqueous polymer dispersion and at least one anionic surfactant, wherein the anionic surfactant comprises at least 85% by weight, preferably at least 90% by weight, more preferably at least 95% by weight, based on the total weight of anionic surfactant in the coating composition, of at least one anionic surfactant S, which is selected from semi-esters of sulfuric acid or phosphoric acid with an alcohol, which alcohol carries at least one alkyl radical having from 8 to 30 carbon atoms or an alkyl substituted phenyl radical wherein alkyl has from 4 to 30 carbon atoms and which alcohol may carry an oligo-C2-C3-alkylene-ether group provided that the number of repeating units in the oligo-C2-C3-alkylene-ether group is at most 15, or a salt thereof.
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Citations
9 Claims
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1. A method for making an aqueous coating composition, which confers stain and penetration resistance when applied to a substrate and dried and/or cured, comprising mixing together at least one pigment, at least one film-forming polymer in the form of an aqueous polymer dispersion, and at least one anionic surfactant of formula (Ia), to obtain the aqueous coating composition;
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wherein said aqueous coating composition comprises; at least one pigment, an aqueous polymer dispersion containing at least one film-forming polymer, and at least one anionic surfactant (S) of formula (Ia); wherein the at least one film-forming polymer, in polymerized form, consists of; (M1a) 40 to 59.4% by weight of methyl methacrylate or a mixture thereof with styrene, (M1b) 40 to 55% by weight of at least one C2-C10 alkyl ester of acrylic acid, (M2) 0.1 to 3% by weight of itaconic acid, acrylic acid, methacrylic acid, or a mixture thereof, (M3a) 0.5 to 3% by weight of acrylamide, methacrylamide, hydroxyethyl acrylate, or a mixture thereof, and (M3b) 0 to 2% by weight of N-(2-methacryloxyethyl) imidazolin-2-one, provided that a total amount of (M1a), (M1b), (M2), (M3a), and (M3b) is 100% by weight and a total amount of (M2), (M3a), and (M3b) is from 0.7 to 5% by weight, based on the total amount of (M1a), (M1b), (M2), (M3a), and (M3b); and wherein the at least one surfactant (S) is of formula (Ia);
M3-n[O4-nP—
(O-(Alk-O)mR)n]
(Ia),wherein n is 1 or 2, m is an integer from 0 to 15, M is hydrogen, an alkali metal ion, or an ammonium ion, Alk is C2-C3-alkylene, and R is C8-C30 alkyl or C4-C30 alkylphenyl; wherein a weight ratio of the at least one pigment to the at least one film-forming polymer ranges from 4;
1 to 1;
5; andwherein the amount of the at least one surfactant (S) of formula (Ia) constitutes at least 85% of the total amount by weight of anionic surfactants in the aqueous coating composition. - View Dependent Claims (2, 3, 4, 5)
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6. A method for providing stain and penetration resistance to a substrate comprising applying an aqueous coating composition to said substrate and drying and/or curing the aqueous coating composition;
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wherein said aqueous coating composition comprises; at least one pigment, an aqueous polymer dispersion containing at least one film-forming polymer, and at least one anionic surfactant (S) of formula (Ia); wherein the at least one film-forming polymer, in polymerized form, consists of; (M1a) 40 to 59.4% by weight of methyl methacrylate or a mixture thereof with styrene, (M1b) 40 to 55% by weight of at least one C2-C10 alkyl ester of acrylic acid (M2) 0.1 to 3% by weight of itaconic acid, acrylic acid, methacrylic acid, or a mixture thereof, (M3a) 0.5 to 3% by weight of acrylamide, methacrylamide, hydroxyethyl acrylate, or a mixture thereof, and (M3b) 0 to 2% by weight of N-(2-methacryloxyethyl) imidazolin-2-one provided that a total amount of (M1a), (M1b), (M2), (M3a), and (M3b) is 100% by weight and a total amount of (M2), (M3a), and (M3b) is from 0.7 to 5% by weight, based on the total amount of (M1a), (M1b), (M2), (M3a), and (M3b); and wherein the at least one surfactant (S) is of formula (Ia);
M3-n[O4-nP—
(O-(Alk-O)mR)n]
(Ia),wherein n is 1 or 2, m is an integer from 0 to 15, M is hydrogen, an alkali metal ion, or an ammonium ion, Alk is C2-C3-alkylene, and R is C8-C30 alkyl or C4-C30 alkylphenyl; wherein a weight ratio of the at least one pigment to the at least one film-forming polymer ranges from 4;
1 to 1;
5; andwherein the amount of the at least one surfactant (S) of formula (Ia) constitutes at least 85% of the total amount by weight of anionic surfactants in the aqueous coating composition. - View Dependent Claims (7, 8, 9)
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Specification