Stable, colloidal, aqueous dispersions of cross-linked urea-urethane polymers and their method of production
US4408008A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 24, 1981 |
| Grant date | Oct 4, 1983 |
| Priority date | — |
| Expiry date | Jul 24, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31605
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of stable, colloidal, aqueous dispersions of cross-linked urea-urethanes which comprises reacting PA1 (a) an aqueously dispersed, substantially linear, isocyanate-terminated prepolymer having a molecular weight of up to about 25,000 and containing PA2 (i) about 0 to 120 milliequivalents of ionic groups per 100 grams of prepolymer, and PA2 (ii) about 0.35 to 10% by weight, based on the weight of the prepolymer, of lateral and/or terminal, hydrophilic ethylene oxide units wherein components (i) and (ii) are present in an amount sufficient to provide a stable dispersion of the prepolymer in the aqueous medium, with PA1 (b) polyfunctional amine chain extenders having an average functionality between about 2.2 and 6.0. The present invention additionally relates to the aqueous dispersions produced by the above process and to the films, coatings or adhesives produced from these dispersions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.