Scrub and stain-resistant coating

Abstract

A coating composition comprising aqueous dispersion of particles made from a copolymer comprising, based on the weight of the copolymer one or more monoethylenically unsaturated monomers; acid functional or anionic monomer and phosphorous-containing monomer.

Description

Claims

1. A coating composition comprising: (A) an aqueous dispersion of particles made from a copolymer comprising, based on the weight of the copolymer: (i) 97.5-99.3 parts by weight of one or more monoethylenically unsaturated monomers;(ii) 0.1-1.0 parts by weight of acid functional or anionic monomer; and(iii) 0.6-1.5 parts by weight of phosphorus-containing monomer; andwhere the dispersion further comprises 0.5-5.0 parts by weight, in relation to parts of copolymer, of an entity containing —(CH2—CHRO)z—X groups, where R=H or CH3, z=3-60, and X is a nonionic, anionic or amphoteric functionality, wherein said —(CH2—CHRO)z—X groups are pendant from the surface of the particles; and(B) titanium dioxide.

2. The composition of claim 1 wherein the copolymer is produced in a process, where the pH is maintained at 1.5 to 4.5 throughout at least 70% of the phosphorus-containing monomer feed.

3. The composition of claim 1 wherein the copolymer is produced in a process, where the pH is maintained at 1.5 to 3.5 throughout at least 70% of the phosphorus-containing monomer feed.

4. The composition of claim 1 wherein monomers (ii) and (iii) are co-fed to the polymerization.

5. The composition of claim 1 wherein the copolymer comprises 0.75-1.0 parts by weight of phosphorus-containing monomer.

6. The composition of claim 1 wherein the copolymer comprises 0.2-0.5 parts by weight of acid functional or anionic monomers.

7. The composition of claim 1 wherein the —(CH2—CHRO)z—X groups are introduced as copolymerizable surfactants having at least one polymerizable ethylenically unsaturated bond or polyalkylene oxide-derivatized (meth)acrylate monomers.