Optical brightening compositions
US8821688B2 · kind B2 · utility
1Cited by
11References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2009 |
| Grant date | Sep 2, 2014 |
| Priority date | — |
| Expiry date | Aug 24, 2029 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/30
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The instant invention relates to mixed salts of optical brighteners of formula (1),wherein M represents a mixture of Mg2+ with another cation, which provide for superior optical brightening effects when applied to the surface of paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.