Water-based polyurethane dispersions and their preparation
AssigneeDow Global Technologies LLC
InventorsFelipe A. Donate, Rebecca J. Wachowicz, Ellen D. Hock, Jason L. Trumble, David S. Laitar, Keosha L. Cade
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Abstract
A prepolymer comprising an acid group is made by a process comprising the step of contacting: (i) a di-isocyanate, (ii) a polyol containing an acid group, and (iii) a polyol without an acid group, the contacting conducted under reaction conditions and in a solvent consisting essentially of: (A) a first component consisting essentially of at least one glycol ether ketone, and (B) optionally, a second component consisting of at least one aprotic glycol ether. The prepolymer is useful in the preparation of water-based polyurethane dispersions.
Claims10
A process for making a prepolymer comprising an acid group, the process comprising the step of contacting
- (i) a di-isocyanate,
- (ii) a polyol containing an acid group, and
- (iii) a polyol without an acid group,
- the contacting conducted under reaction conditions and in a solvent consisting essentially of:
- (A) a first component consisting of at least one glycol ether ketone selected from one or more of the glycol ether ketone is 1-n-butoxy-2-propanone, 1-(2-methoxy-1-methylethoxy)-2-propanone, or 1-(2-n-propoxy-1-methylethoxy)-2-propanone, and
- (B) optionally, a second component consisting of at least one aprotic glycol ether.
A blend comprising (1) a glycol ether ketone selected from one or more of the glycol ether ketone is 1-n-butoxy-2-propanone, 1-(2-methoxy-1-methylethoxy)-2-propanone, or 1-(2-n-propoxy-1-methylethoxy)-2-propanone, and (2) an aprotic glycol ether.
A polyurethane dispersion (PUD) comprising (i) a prepolymer comprising an neutralized acid group, (ii) a glycol ether ketone selected from one or more of the glycol ether ketone is 1-n-butoxy-2-propanone, 1-(2-methoxy-1-methylethoxy)-2-propanone, or 1-(2-n-propoxy-1-methylethoxy)-2-propanone, and (iii) water.
Dependencies are inferred from the claim text.