Paste resin for universal pigment paste

Abstract

The invention relates to a paste resin AB which is a mixture of a water-reducible alkyd resins B and a basic acrylic copolymer resin A comprising at least one amino group-containing vinyl type monomer A1, and a method of use thereof for formulating both water-borne and solvent-borne tinted paints with a wide variety of pigments.

1 . A paste resin AB which is a mixture of a water-reducible alkyd resin B and a basic acrylic copolymer resin A, wherein the basic acrylic copolymer resin A is a copolymer of at least three classes of vinylic monomers having each at least one copolymerisable olefinic unsaturation, the vinylic monomers comprising at least one amino group-containing vinyl type monomer A1, at least one monomer A2 selected from the group consisting of linear or branched alkyl(meth)acrylates having from 1 to 13 carbon atoms in the alkyl group, and at least one hydrophilic vinyl monomer A3 having a moiety derived from a polyether glycol which is a polyethylene glycol or a mixed ether of ethylene and propylene glycol having a mass fraction of at least 60% of oxyethylene groups in the total mass of oxyalkylene groups, where one of the hydroxyl groups of the polyetherglycol is converted to an ether group, and the other hydroxyl group is consumed by esterification with an olefinically unsaturated monocarboxylic acid, or by etherification with an olefinically unsaturated alcohol, or by urethane formation via reaction with an adduct of a hydroxyalkyl(meth)acrylate and a diisocyanate. 
     
     
         2 . The paste resin AB of  claim 1  wherein the water-reducible alkyd resin B has an acid number of from 0.2 mg/g to 5 mg/g. 
     
     
         3 . The paste resin AB of  claim 1  wherein the water-reducible alkyd resin B is based on a condensation product of an alkyd resin Ba and an adduct Bb of a C 1 - to C 4 -monoalkyl ether Bb1 of a polyoxyethylene glycol or of a C 1 - to C 4 -monoalkyl ether Bb2 of a mixed ether of ethylene and propylene glycol, or mixtures thereof, and an anhydride Bb3 of a cycloaliphatic dicarboxylic acid, and wherein in the water-reducible alkyd resin B, the ratio of the sum of the amounts of substance of Bb1 and Bb2 to the amount of substance of Bb3 being from 0.95 mol: 1.05 mol to 1.05 mol: 0.95 mol. 
     
     
         4 . The paste resin AB of  claim 1  wherein the mass fraction of monomers A1 is from 15% to 40%, the mass fraction of monomers A2 is from 15% to 45%, and the mass fraction of monomers A3 is from 30% to 60%. 
     
     
         5 . The paste resin AB of  claim 1  wherein the monomer A3 is a reaction product of polyethylene glycol monoether, toluylene diisocyanate and hydroxyethyl methacrylate. 
     
     
         6 . The paste resin AB of  claim 3  wherein the alkyd resin Ba is made by co-condensation of one or more polyols Ba1 having two or more hydroxyl groups per molecule, one or more polybasic acids Ba2, and one or more fatty acids Ba3 which may be replaced, or mixed with, one or more triglyceride oils Ba4. 
     
     
         7 . The paste resin AB of  claim 1  wherein the constituents A and B are mixed in a mass ratio of from 45% to 75% of A and from 55% to 25% of B. 
     
     
         8 . A pigment paste comprising the paste resin AB of  claim 1  and at least one pigment selected from the group consisting of inorganic pigments and organic pigments. 
     
     
         9 . A method of use of the paste resin of  claim 1  comprising mixing the said paste resin AB with at least one pigment, homogenising the mixture under shear to form a pigment paste, and mixing the said pigment paste with an unpigmented or white pigmented paint comprising an organic paint binder. 
     
     
         10 . The method of  claim 9  wherein the said paint binder is selected from the group consisting of alkyd resins, acrylic resin, acrylic modified alkyd resins, urethane alkyds, and urethane modified acrylic resins. 
     
     
         11 . The method of  claim 9  wherein the paint is a water-borne paint. 
     
     
         12 . The method of  claim 9  wherein the paint is a solvent-borne paint.