Aqueous, autocrosslinking polyurethane-vinyl hybrid dispersions
First Claim
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1. A process for the production of an aqueous, autocrosslinking polymer dispersion binder which comprises polyhydrazides and carbonyl-containing urethane-vinyl hybrid polymers, which are composed of vinyl-containing urethane macromonomer blocks and vinyl blocks derived from further vinyl monomer units, at least one of which contains one or more carbonyl groups, said process comprising the steps of:
- (a) reacting polyhydroxy compounds, polyisocyanates, vinyl monomers, and hydrophilic monomers which contain hydrophilic groups to form a vinyl-containing urethane macromonomer;
(b) dispersing said vinyl-containing urethane macromonomer in water;
(c) reacting said dispersed vinyl-containing urethane macromonomer with further vinyl monomers by free radical-initiated polymerization, wherein at least one of the further vinyl monomers contains one or more carbonyl groups, to form a carbonyl-containing polyurethane-vinyl hybrid; and
(d) adding an effective crosslinking amount of a polyhydrazide.
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Abstract
Aqueous, autocrosslinking polymer dispersion binders comprising polyhydrazides and carbonyl-containing polyurethane-vinyl hybrid polymers and also, if desired, conventional additives, are useful in base coatings, aqueous coatings, adhesives and printing inks.
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6 Claims
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1. A process for the production of an aqueous, autocrosslinking polymer dispersion binder which comprises polyhydrazides and carbonyl-containing urethane-vinyl hybrid polymers, which are composed of vinyl-containing urethane macromonomer blocks and vinyl blocks derived from further vinyl monomer units, at least one of which contains one or more carbonyl groups, said process comprising the steps of:
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(a) reacting polyhydroxy compounds, polyisocyanates, vinyl monomers, and hydrophilic monomers which contain hydrophilic groups to form a vinyl-containing urethane macromonomer; (b) dispersing said vinyl-containing urethane macromonomer in water; (c) reacting said dispersed vinyl-containing urethane macromonomer with further vinyl monomers by free radical-initiated polymerization, wherein at least one of the further vinyl monomers contains one or more carbonyl groups, to form a carbonyl-containing polyurethane-vinyl hybrid; and (d) adding an effective crosslinking amount of a polyhydrazide. - View Dependent Claims (2, 3, 4, 5, 6)
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