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.
Claims14
A process for preparing a stable polyurethane latex comprising admixing a polyurethane prepolymer with water, a surfactant, and a chain extender 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 a polyisocyanate component and polyol component,
- (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 containing 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 an anionic surfactant;
- and
- (3) a polymer comprising the reaction product of:
- (i) an ethylene oxide capped poly(propylene oxide) polyol component having a molecular weight of from about 1500 to about 6000 wherein from 5 to 40 percent by weight of the polyol component is ethylene oxide,
- (ii) optionally a polyether monol having an ethylene oxide content of greater than 40% by weight,
- (iii) optionally, a diol having a molecular weight of from about 30 to 500,
- (iv) an aromatic polyisocyanate, and
- (v) a diamine, water, or combination thereof.
Dependencies are inferred from the claim text.