US 4,283,320 AGranted

Semi-gloss latex paint

AssigneeSCM Corporation

InventorsHoward E. Carroll, Gerald M. Sweitzer

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Abstract

An opacified latex paint comprising small particle film-forming latex binders in combination with minor amounts of opacifying pigment, and substantial amounts of non-film-forming polymeric particles (plastic pigment) provides a semi-gloss latex paint composition having excellent hard enamel surfaces along with desirable film integrity properties. The plastic pigment particles are between about 0.1 and 0.5 microns and contain 0.2 to 2% copolymerized monomers containing carboxylic acid groups. The semi-gloss plastic pigment latex paint is compounded at pigment-volume-content (PVC) between about 30% and 45% and considerably higher than conventional high quality enamel latex paints. The opacified semi-gloss paint films exhibit excellent physical properties such as hard enamel surfaces, scrub resistance, burnish resistance, mar resistance, stain resistance, and other desirable paint film integrity properties.

Claims3

Dependent claims

An aqueous latex dispersion paint composition which coalesces at an ambient coalescing temperature into a semi-gloss hardened continuous paint film, said latex paint having about 30% to 70% by weight total solids and comprising on a dry solids volume basis:

55% to 70% of a film-forming latex binder having a major weight portion of polymer particles between about 500 A and 5000 A and having a glass transition temperature at least about 5.degree. C. below said coalescing temperature whereby said binder particles will coalesce into a binding matrix, said binder particles being a vinyl copolymer comprising by weight at least 40% polymerized vinyl unsaturated monomers;
10% to 25% of solid, non-cellular, non-film-forming polymer particles having a weighted average diameter between about 1000 A and 5000 A and having a glass transition temperature at least about 30.degree. C. above the glass transition temperature of said binder, said non-film-forming polymer particles being polymerized ethylenicaly unsaturated monomers containing between 0.2% and 2% of copolymerized acid monomer selected from acrylic acid or methacrylic acid;
5% to 20% opacifying pigment having a refractive index of at least about 1.8;
0% to 15% of non-opacifying pigment;
and said latex paint having a pigment-volume-content (PVC) between about 30% and 45% PVC but less than critical-PVC as measured by opacity.

2 more elements

Dependencies are inferred from the claim text.