Fluorescent whitening of paper
US5622749A · kind A · utility
14Cited by
8References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 22, 1996 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | May 22, 2016 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H19/46
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Accordingly, the present invention provides a method for the fluorescent whitening of paper comprising contacting the paper surface with a coating composition comprising a fluorescent whitening agent having the formula: ##STR1## wherein M is hydrogen, an alkali metal, preferably sodium, ammonium or magnesium; or comprising contacting the paper in the size press with a combination of the compound of formula (1) and an auxiliary selected from a sequestering agent and a dispersing agent and/or an emulsifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.