Fluorescent whitening agents, products comprising the agent and method of use thereof
US5026507A · kind A · utility
3Cited by
16References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 4, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | May 4, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H27/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A paper additive of high whiteness and low biological toxicity comprising a whitening amount of a compound of the formula ##STR1## wherein R is H or (C.sub.1 -C.sub.6)alkyl R' is independently H or (C.sub.1 -C.sub.6)alkyl, R" is H or NR'.sub.n, and n is 2 or 3, wherein if n=3 the compound further comprises X.sup.-, wherein X.sup.- is an anion. A paper of high whiteness and low biological toxicity is coated or filled with the above additive, and a food product is packaged with the paper of this invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.