Method for temporarily coloring article with acid labile colorant
US5071440A · kind A · utility
23Cited by
5References
36Claims
0Family size
Inventors
Key dates
| Filing date | Oct 1, 1990 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Oct 1, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S8/924
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An article may be temporarily colored by application of an aqueous solution of a polyoxyalkylene substituted chromophore characterized by a N.dbd.pair with an electron withdrawing group bonded to one element of the pair and an electron donating group bonded to the opposite element. The polyoxyalkylene substituent imparts solubility to the colorant and bulk to prevent penetration into interstices in the article being colored. The colorant may be subsequently decolorized in hydrolysis when an aqueous acid solution is applied to the colorant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.