US 2026/0226281 A1Published application

Aqueous coating composition and method of preparing coating

AssigneeDow Global Technologies LLC

InventorsHu LI, Jia TANG, Baoqing ZHENG

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Abstract

An aqueous coating composition contains: (A) an emulsion polymer comprising structural units from monomers based on total weight of the monomers (i) 0.48-1.5 wt % of an ethylenically unsaturated phosphorous-containing monomer, (ii) 0.7-32 wt % of diacetone (meth)acrylamide, (iii) 10-80 wt % of a vinyl aromatic monomer, (iv) an alkyl (meth)acrylate, and (v) 0-5 wt % of an α, β-ethylenically unsaturated carboxylic acid, a salt thereof, or mixtures thereof; (B) a specific dicarboxylic acid, a salt thereof, or mixtures thereof at a specific concentration; (C) 30-60 wt % of a thio-, amido-, or imido-derivative of triphosphonic acids, a salt thereof, or mixtures thereof; (D) a water-soluble alkali metal silicate to provide a dry weight ratio of (D):(C) of 1.2 to 3.7; and (E) from 40-52 wt % of tannic acid, gallic acid, pyrogallol, or citric acid; a salt thereof; or combinations thereof; where weight percentages are relative to the emulsion polymer weight. A method using such composition as a base coat.

Claims10

Dependent claims

An aqueous coating composition comprising,

(A) an emulsion polymer comprising:
(i) from 0.48% to 1.5% by weight of structural units of an ethylenically unsaturated phosphorous-containing monomer,
(ii) from 0.7% to 3% by weight of structural units of diacetone (meth)acrylamide,
(iii) from 10% to 80% by weight of structural units of a vinyl aromatic monomer,
(iv) structural units of an alkyl (meth)acrylate, and
(v) from zero to 5% by weight of structural units of an α, β-ethylenically unsaturated carboxylic acid, a salt thereof, or mixtures thereof;
(B) a dicarboxylic acid, a salt thereof, or mixtures thereof;
wherein the dicarboxylic acid has the structure of formula (I):
where R is alkylene, alkenylene, alkynylene, cycloalkylene, cycloalkenylene, cycloalkynylene, arylene, or heterocyclic arylene;
containing 6 to 18 carbon atoms;
and
wherein (B) the dicarboxylic acid, the salt thereof, or mixtures thereof is present in an amount to provide —OOC—R—COO— segments at a concentration of from 1.1% to 3.8% by weight;
(C) from 30% to 60% by weight of a thio-, amido-, or imido-derivative of triphosphonic acids, a salt thereof, or mixtures thereof;
(D) a water-soluble alkali metal silicate that is present in an amount to provide a dry weight ratio of (D) the water-soluble alkali metal silicate to (C) the thio-, amido-, or imido-derivative of triphosphonic acids, the salt thereof, or mixtures thereof, in a range of 1.2 to 3.7;
and
(E) from 40% to 52% by weight of tannic acid, gallic acid, pyrogallol, or citric acid;
a salt thereof;
or combinations thereof;
where weight percentages are relative to the emulsion polymer weight.

16 more elements

Dependencies are inferred from the claim text.