Method for reducing water uptake in silyl terminated sulfopoly(ester-urethanes)
US5929160A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1997 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Sep 25, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of decreasing the water uptake in a sulfopoly(ester-urethane) by preparing said sulfopoly(ester-urethane) from a chain extended sulfopolyester polyol which itself has been prepared in a two-step method, said sulfopoly(ester-urethane) comprising in its backbone at least one non-terminal arylene or alkylene group comprising a pendant sulfonic acid group or salt thereof, said sulfonic acid group or salt thereof having the formula ##STR1## wherein R is a trivalent aliphatic or aromatic group and M is a cation, said sulfonic acid group or salt thereof being bonded directly through said aliphatic or aromatic group to ester groups, the polymer of said sulfo(polyester-urethane) being terminated by at least one hydrolyzable silyl group, said two-step method for preparing said chain extended sulfopolyester polyol comprising the steps of: PA1 a) reacting a sulfopolycarboxylic acid or ester with a polyol to produce a sulfopolyester polyol, PA1 b) chain extending said sulfopolyester polyol by an esterification reaction with a lower aliphatic lactone to produce a chain extended sulfopolyester polyol, and said chain extended sulfopolyester polyol then, (1) in one embodiment, being reacte…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.