Grafted pigment dispersing polymeric additive and paint employing the same with improved hiding
AssigneeColumbia Insurance Company
InventorsGary Dandreaux, Kevin Scanlon, Robert J. Sheerin, Ashley Brewer
Life of this patent
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Abstract
The present invention relates to a grafted pigment dispersing polymeric additive for opacifying pigments, prepared by polymerizing monomers in the presence of a polymeric pigment dispersant. The polymeric pigment dispersant has low molecular weight, high acid number and is dissolvable in alkali solution. When incorporated into paint compositions, hiding is improved with less opacifying pigments.
Claims21
A grafted pigment dispersing polymeric additive comprising a polymeric pigment dispersant and a polymeric carrier grafted to each other, wherein the polymeric pigment dispersant has a weight average molecular weight of about 1,000 Daltons to about 20,000 Daltons and an acid number from about 150 to about 250 and wherein the polymeric pigment dispersant is soluble in an alkali solution, and
- wherein the minimum film forming temperature (MFFT) of the polymeric carrier is greater than about 10° C. and less than about 130° C., and
- wherein the grafted pigment dispersing polymeric additive is capable of adsorbing to an opacifying pigment, and
- wherein the additive comprises particles having an average particle size in the range of about 75 nm to about 200 nm in diameter.
A grafted pigment dispersing polymeric additive comprising a polymeric pigment dispersant and a polymeric carrier grafted to each other, wherein the polymeric pigment dispersant has a weight average molecular weight of about 5,000 Daltons to about 20,000 Daltons and an acid number from about 150 to about 250 and wherein the polymeric pigment dispersant is soluble in an alkali solution, and
- wherein the polymeric carrier comprises at least a styrene or an acrylic group,
- wherein the grafted pigment dispersing polymeric additive is capable of adsorbing to an opacifying pigment, and
- wherein the additive comprises particles having an average particle size in the range of about 75 nm to about 200 nm in diameter.
Dependencies are inferred from the claim text.