Low color and low haze formulations of sodium o-phenylphenate
US6362152B1 · kind B1 · utility
12Cited by
13References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 2000 |
| Grant date | Mar 26, 2002 |
| Priority date | — |
| Expiry date | Apr 7, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/88
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A color stable aqueous solution containing a relatively high concentration of sodium o-phenylphenate is described where stabilizing components include an oxygen scavenger and a free radical scavenger. The aqueous solutions of NaOPP prepared according to the present invention exhibit an absorbance at 400 nanometers of at most one-half the absorbance exhibited by untreated solutions after incubation for 72 hours at 44° C. and 4 hours under ultraviolet light. The aqueous solution is useful as a concentrate that can be diluted to a desirable antimicrobial concentration level prior to application.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.