Fluorescent whitening agents
US6210449A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1999 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | Sep 20, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S8/919
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides new compounds having formula (1), in which X is 0 or, preferably, NH; M is hydrogen, an alkali metal atom, ammonium or a cation formed from an amine; each R.sub.1, independently, is an aminoacid residue from which a hydrogen atom on the amino group has been removed; n is 1 or 2; and each R.sub.2, independently, is hydrogen, C.sub.1 -C.sub.3 alkyl, halogen, cyano, COOR in which R is hydrogen or C.sub.1 -C.sub.3 alkyl, CONH--R in which R has its previous significance, SO.sub.2 NH--R in which R has its previous significance, NH--COR in which R has its previous significance, SO.sub.3 M in which M has its previous significance or, when n is 1, R.sub.2 can also be CO--R.sub.3 in which R.sub.3 is C.sub.1 -C.sub.3 alkyl or phenyl; provided that those compounds are excluded in which a) X is NH, n is 1 and R.sub.2 is SO.sub.3 M in which M has its previous significance; or b) X is NH, n is 2 and one R.sub.2 is SO.sub.3 M in which M has its previous significance, and the other R.sub.2 is hydrogen, methyl or halogen; or c) X is NH, n is 1, R.sub.1 is glycine and R.sub.2 is H or CO.sub.2 H; or d) X is NH, n is 2, each R.sub.2 is SO.sub.3 M in which M has its previo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.