Use of aqueous polymer dispersion in coating agents for improving colour retention

Patent metadata

Field	Value
Publication number	US-9926452-B2
Application number	US-201314440503-A
Country	US
Kind code	B2
Filing date	Nov 6, 2013
Priority date	Nov 15, 2012
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

The present invention provides the use of aqueous polymer dispersions comprising (a) at least two monomers M1 having a glass transition temperature ≥25° C., (b) at least two monomers M2 having a glass transition temperature <25° C., and also further monomers M3, as binders in coating materials for improving the shade stability (color retention).

First claim

The invention claimed is:

1. A method for improving color retention in an exterior paint comprising adding as a binder to the exterior paint an aqueous polymer dispersion obtained by polymerization of:
(a) at least two monomers M1 having a glass transition temperature ≥25° C.,
(b) at least two monomers M2 having a glass transition temperature <25° C.,
and at least one monomer M3,
wherein the binder comprises 17 to 27% of the monomers M1, which are methyl methacrylate and styrene, 68 to 77% of the monomers M2, which are n-butyl acrylate and 2-ethylhexyl acrylate, and 0.1 to 10% of the at least one monomer M3, and wherein the amount of styrene in the case of the monomers M1 is from 5 to 15%.

2. The method according to claim 1 , wherein the at least one monomer M3 is selected from the group consisting of acrylic acid, methacrylic acid, acrylamide, hydroxyethyl (meth)acrylate, and hydroxypropyl (meth)acrylate.

Assignees

• Basf Se

Inventors

• Jahns Ekkehard
• Roller Sebastian
• Kurek Alexander
• Cabrera Ivan
• Mollat Du Jourdin Xavier
• Tissier Nicolas

Classifications

• C08F220/14

  Methyl esters {, e.g. methyl (meth)acrylate} · CPC title

• C09D4/00 Primary

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title

• C08K3/0033

  Chemistry & Metallurgy · mapped topic

• C09D133/00 Primary

  Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers · CPC title

• C09D7/63

  organic · CPC title