Method of stabilizing an aqueous coating composition
AssigneeBASF Coatings GmbH
InventorEkkehard Sapper
Life of this patent
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Abstract
The use as an additive for coating formulations is claimed of a polymer dispersion which comprises (i) an acrylate polymer based on from 30 to 60% by weight of C1-C8-alkyl (meth)acrylate monomers, from 30 to 60% by weight of vinylaromatic monomers and from 0.5 to 10% by weight of (meth)acrylic acid, and (ii) a nonassociative rheology stabilizer comprising an acrylate copolymer based on C1-C6-alkyl (meth)acrylate and (meth)acrylic acid.
Claims17
A method of stabilizing an aqueous coating formulation, comprising a step of adding a polymer dispersion to the aqueous coating formulation, wherein said polymer dispersion comprises
- (i) an acrylate polymer prepared by polymerizing from about 30 to about 60% by weight of at least one C1 to C8 alkyl (meth)acrylate monomer, from about 30 to about 60% by weight of at least one vinylaromatic monomer, and from about 0.5 to about 10% by weight of (meth)acrylic acid, and
- (ii) a nonassociative rheology stabilizer comprising an acrylate copolymer prepared by polymerizing at least one C1 to C8 alkyl (meth)acrylate monomer and (meth)acrylic acid.
A method of maintaining a viscosity for an aqueous coating formulation, comprising steps of:
- (a) providing an aqueous coating formulation having an initial viscosity;
- (b) subjecting said coating formulation to conditions that cause the viscosity of the coating formulation to decrease;
- and
- (c) adding to the coating formulation a polymer dispersion to increase the viscosity of the coating formulation, wherein said polymer dispersion comprises
- (i) an acrylate polymer prepared by polymerizing from about 30 to about 60% by weight of at least one C1 to C8 alkyl (meth)acrylate monomer, from about 30 to about 60% by weight of at least one vinylaromatic monomer, and from about 0.5 to about 10% by weight of (meth)acrylic acid, and
- (ii) a nonassociative rheology stabilizer comprising an acrylate copolymer prepared by polymerizing at least one C1 to C8 alkyl (meth)acrylate monomer and (meth)acrylic acid.
Dependencies are inferred from the claim text.