Method of dyeing paper utilizing trisazo dyes
US5049238A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1989 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Jul 19, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S8/919
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of dyeing paper utilizing dyes suitable for dyeing paper in blue shades having the formula ##STR1## wherein R is hydrogen, --OH, --OR.sup.1 , --NH.sub.2, NHR.sup.1, --NHCOR.sup.1, --NHSO.sub.2 R.sup.1, --NHCONH.sub.2 or --NHCONHR.sup.1, in which R.sup.1 is unsubstituted alkyl or alkyl substituted by C.sub.1 -C.sub.4 -alkoxy, hydroxy-substituted C.sub.1 -C.sub.4 -alkoxy, phenyl, phenoxy or phenylcarbamoyl, in each instance the phenyl moiety being unsubstituted or substituted by C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -alkoxy or phenoxy, R.sup.1 is also unsubstituted phenyl or naphthyl or phenyl or naphthyl which is substituted by sulfo, carboxy, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, halogen, nitro, C.sub.1 -C.sub.4 -alkylcarbonylamino or C.sub.1 -C.sub.4 -alkoxycarbonylamino; PA1 X, each independently of the other, is hydrogen, unsubstituted alkyl or alkoxy or alkyl or alkoxy which is substituted by C.sub.1 -C.sub.4 -alkoxy, hydroxy-substituted C.sub.1 -C.sub.4 -alkoxy, phenyl, phenoxy or phenylcarbamoyl, in each instance the phenyl moiety being unsubstituted or substituted by C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or phenoxy or X is halogen, sulf…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.