Two-component polyurethane composition
AssigneeDow Global Technologies LLC
InventorsXiaohong Yang, Jinfei Wang, Fengzhe Shi
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Abstract
A two-component polyurethane composition comprising a polyisocyanate and an emulsion polymer having greater than 2.2% of hydroxy groups in the emulsion polymer and comprising structural units of a polymerizable surfactant, a first hydroxy-functional monomer, an acid monomer and/or a salt thereof, an additional monoethylenically unsaturated nonionic monomer, and optionally a second hydroxy-functional alkyl (meth)acrylate; the two-component polyurethane composition providing improved alcohol resistance without compromising both acid and alkali resistance.
Claims9
A two-component polyurethane composition comprising an emulsion polymer and a polyisocyanate, wherein the emulsion polymer having a weight average molecular weight of 180,000 g/mol or less comprises, by weight based on the weight of the emulsion polymer,
- (a) 0.3% or more of structural units of a polymerizable surfactant,
- (b) greater than 25% of structural units of a first hydroxy-functional monomer of the following formula,
- where R11 is hydrogen or —CH3;
- R12, R13, and R14 are each independently an alkyl group;
- provided that R12, R13, and R14 together contain from 3 to 20 carbon atoms;
- and B is
- (c) from zero to 40% of structural units of a second hydroxy-functional alkyl (meth)acrylate;
- (d) structural units of an acid monomer, a salt thereof, or mixtures thereof;
- and
- (e) structural units of an additional monoethylenically unsaturated nonionic monomer;
- wherein the emulsion polymer comprises greater than 2.2% of hydroxy groups, by weight based on the weight of the emulsion polymer.
Dependencies are inferred from the claim text.