Method for stabilizing the whiteness of fluorescent whitening agent(s)(FWA) included in surface-treatment size/coating slip for paper and of surface-treatment layers formed thereof
US9493913B2 · kind B2 · utility
0Cited by
5References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 14, 2007 |
| Grant date | Nov 15, 2016 |
| Priority date | — |
| Expiry date | Jan 6, 2028 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/16
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a method for increasing the whiteness stability of fluorescent whitening agent(s) (FWA) included in surface-treatment size/coating slip for paper and of the surface-treatment layers formed thereof. The method is characterized in that sorbitol is charged to the size/coating slip as a carrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.