Polyurethane latexes, processes for preparing them and polymers prepared therewith
AssigneeThe Dow Chemical Company
InventorsRick L. Tabor, Douglas R. Moore, James J. Jakubowski, Wayne R. Willkomm, Ruben Solis
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Abstract
Disclosed are stable aqueous polyurethane latexes prepared from prepolymer formulations including a polyisocyanate component and polyol component, wherein from 5 to 40 percent of the weight of the polyol component is ethylene oxide in the form of ethylene oxide applied as an end cap onto a propylene oxide or higher oxyalkylene polyoxyalkylene polyol, and no more than 45 percent of the weight of polyol component is ethylene oxide. These latexes are prepared without the use of organic solvents.
Claims20
A process for preparing a stable polyurethane latex comprising admixing a polyurethane prepolymer with water, an anionic surfactant, and a chain extender in the absence of an organic solvent under conditions sufficient to disperse the prepolymer and chain extender reaction product to form a latex wherein:
- (i) the prepolymer is prepared from a prepolymer formulation including an aromatic polyisocyanate component and polyol component, such that the NCO to OH ratio is about 3.2 to about 6.7 and the polyol component has a molecular weight from about 750 to about 8000,
- (ii) from 5 to 40 percent of the weight of the polyol component is ethylene oxide in the form of ethylene oxide applied as an end cap onto a propylene oxide or higher oxyalkylene polyoxyalkylene polyol, and
- (iii) no more than 45 percent of the weight of polyol component is ethylene oxide.
A stable polyurethane latex comprising:
- (1) a continuous aqueous phase;
- and
- dispersed therein:
- (2) from about 0.1 to about 10.0 percent by weight of a surfactant;
- and
- (3) a polymer comprising the reaction product of:
- (i) polyurethane prepolymer of a polyisocyanate component and polyol component wherein the polyisocyanate and polyol components have an NCO/OH ratio of about 3.2 to about 6.7, from 5 to 40 percent of the weight of the polyol component is ethylene oxide in the form of ethylene oxide applied as an end cap onto a propylene oxide or higher oxyalkylene polyoxyalkylene polyol, and no more than 45 percent of the weight of polyol component is ethylene oxide and
- (ii) a diamine, water, or combination thereof.
A stable polyurethane dispersion having no organic solvents comprising:
- (1) a continuous aqueous phase;
- and
- dispersed therein:
- (2) from about 0.1 to about 10.0 percent by weight of a surfactant;
- and
- (3) a polymer comprising the reaction product of:
- (i) polyurethane prepolymer of an aromatic polyisocyanate component and polyol component wherein the aromatic polyisocyanate and polyol components have an NCO/OH ratio of at least about 3.2 to about 6.7, from 5 to 40 percent of the weight of the polyol component is ethylene oxide in the form of ethylene oxide applied as an end cap onto a propylene oxide or higher oxyalkylene polyoxyalkylene polyol, and no more than 45 percent of the weight of polyol component is ethylene oxide, the MW of the polyol component is from about 750 to about 8000 and
- (ii) a diamine, water, or combination thereof.
Dependencies are inferred from the claim text.