Process for producing colored paper using granulated dye compositions
US4198268A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1975 |
| Grant date | Apr 15, 1980 |
| Priority date | — |
| Expiry date | Aug 20, 1995 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/28
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the dyeing of paper with granulated dyeing preparations, preferably dissolved in water. For the process granulated dyeing preparations are used which consist of PA1 (a) a dye soluble to at least 2% in water at 25.degree. C. and PA1 (b) in an amount not greater than 50%, a salt which dissociates in water, the average size of the granules being at least 20 microns. This application is a continuation of application Ser. No. 239,360, filed Mar. 29, 1972 and now abandoned, which in turn is a continuation-in-part of application Ser. No. 60,115, filed July 31, 1970 and now abandoned, which in turn is a continuation-in-part of application Ser. No. 761,333, filed Sept. 20, 1968 and now abandoned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.