Hardening a hydrophilic colloid composition
US5800977A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1996 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Jul 24, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/307
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A hydrophilic colloid is hardened with a vinyl-sulfone hardener in the presence of a borate compound in an amount sufficient to accelerate the rate of hardening. The borate compound is preferably a compound of Formula (I), or a salt, hydrate or precursor thereof: EQU B(L).sub.n (I) wherein each L is independently --OH, --OR, --NH, --NR, or a substituted or unsubstituted alkyl group, substituted or unsubstituted aryl group, or substituted or unsubstituted heterocyclic group; R is a substituted or unsubstituted alkyl group or substituted or unsubstituted aryl group; and, n is 1, 2, or 3, with the proviso that at least one L is --OH. Preferred borate compounds are sodium and potassium borate, and hydrates thereof, and phenyl boronic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.