Self-etching cementitious substrate coating composition
First Claim
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1. A coating composition, comprising a multistage latex polymer;
- silane; and
a water-soluble inorganic, or a water-soluble monomeric or oligomeric organic, acid, acid anhydride or acid salt capable of etching or otherwise reacting with the surface of a cementitious substrate;
with such acid, acid anhydride or salt being in an amount of about 1 to about 40 wt. % of the composition and providing improved coating adhesion to such substrate compared to a coating composition that does not contain such acid, acid anhydride or salt, and wherein the composition has a minimum film forming temperature of about 0 to about 55°
C. and contains less than 10 wt. % volatile organic compounds.
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Abstract
Coating compositions for cementitious substrates may be made from a multistage latex polymer; silane; and a water-soluble acid, acid anhydride or acid salt capable of etching or otherwise reacting with the surface of the substrate to provide improved coating adhesion. The silane may be present as a silane coupling agent distinct from the multistage latex polymer, or may be present as silane functionality on the multistage latex polymer. The coating compositions adhere well to cementitious substrates and have a self-etching capability which improves coating adhesion, especially near edges and corners.
208 Citations
34 Claims
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1. A coating composition, comprising a multistage latex polymer;
- silane; and
a water-soluble inorganic, or a water-soluble monomeric or oligomeric organic, acid, acid anhydride or acid salt capable of etching or otherwise reacting with the surface of a cementitious substrate;
with such acid, acid anhydride or salt being in an amount of about 1 to about 40 wt. % of the composition and providing improved coating adhesion to such substrate compared to a coating composition that does not contain such acid, acid anhydride or salt, and wherein the composition has a minimum film forming temperature of about 0 to about 55°
C. and contains less than 10 wt. % volatile organic compounds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 32, 33, 34)
- silane; and
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30. A method for preparing a coated article, which method comprises (i) providing a cementitious substrate;
- (ii) applying to a surface portion of the substrate an aqueous coating composition comprising a multistage latex polymer;
silane; and
a water-soluble inorganic, or a water-soluble monomeric or oligomeric organic, acid, acid anhydride or acid salt capable of etching or otherwise reacting with the surface of such substrate, with such acid, acid anhydride or salt being in an amount of about 1 to about 40 wt. % of the composition and providing improved coating adhesion to such substrate compared to a coating composition that does not contain such acid, acid anhydride or salt, and wherein the composition has a minimum film forming temperature of about 0 to about 55°
C. and contains less than 10 wt. % volatile organic compounds; and
(iii) allowing the coating composition to harden.
- (ii) applying to a surface portion of the substrate an aqueous coating composition comprising a multistage latex polymer;
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31. A coated article comprising a cementitious substrate having at least one major surface on which is coated a layer comprising an aqueous coating composition comprising a multistage latex polymer;
- silane; and
a water-soluble inorganic, or a water-soluble monomeric or oligomeric organic, acid, acid anhydride or acid salt capable of etching or otherwise reacting with the surface of such substrate;
with such acid, acid anhydride or salt being in an amount of about 1 to about 40 wt. % of the composition and providing improved coating adhesion to such substrate compared to a coating composition that does not contain such acid, acid anhydride or salt, and wherein the composition has a minimum film forming temperature of about 0 to about 55°
C. and contains less than 10 wt. % volatile organic compounds.
- silane; and
Specification