Water-based polyurethane dispersions and their preparation
US11267925B2 · kind B2 · utility
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9Claims
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Key dates
| Filing date | Jun 30, 2017 |
| Grant date | Mar 8, 2022 |
| Priority date | — |
| Expiry date | Jun 30, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D175/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A prepolymer comprising acid functionality is made by a process comprising the step of contacting: (i) a di-isocyanate, (ii) a polyol containing an acid group, (iii) a polyol without an acid group, and (iv) a metal salt catalyst, the contacting conducted under reaction conditions and in a solvent consisting essentially of: (A) a dialkyl amide, and (B) optionally, an aprotic glycol ether. The prepolymer is useful in the preparation of water-based polyurethane dispersions, and certain of the solvent blends consisting essentially of a dialkyl amide and an optional aprotic glycol ether are azeotropic or pseudo-azeotropic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.