Process for the preparation of aqueous polyurethane dispersions
US4314922A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1981 |
| Grant date | Feb 9, 1982 |
| Priority date | — |
| Expiry date | Feb 5, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing aqueous polyurethane dispersions has been discovered which comprises PA1 (a) forming a polyurethane solution by reacting an organic polyisocyanate in the presence of a solvent with PA2 (i) an acrylic ester diol having a molecular weight of between 146 and 3,000; PA2 (ii) an organic polyhydroxyl compound other than (i) having a molecular weight between 400 and 5,000 selected from the group consisting of polyester polyols, polyether polyols, polycarbonates, polylactones, and mixtures thereof; and PA2 (iii) a chain extender having a molecular weight between 62 and 400 selected from the group consisting of diols, triols, diamines, aminoalcohols, and mixtures thereof; PA1 (b) forming an anionic polyurethane addition product by reacting said polyurethane solution with a mercaptocarboxylic acid salt in the presence of a solvent; PA1 (c) adding water; and PA1 (d) removing the solvent. The dispersions can be used in a variety of applications. For instance, they can be used to prepare films, coating, and binders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.