Salts of dehydroacetic acid as a pyrithione stabilizer in plastics
US9034943B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2010 |
| Grant date | May 19, 2015 |
| Priority date | — |
| Expiry date | Mar 26, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P31/10
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention provides a method for preventing discoloration of pyrithione-containing materials, in particular plastic materials or other material such as paints, coatings, adhesives or textiles which are exposed to an outdoor environment. The method is likewise suited for preventing discoloration of other pyrithione-containing materials such as personal care compositions like shampoos. A discoloration inhibitor that includes dehydroacetic acid or a salt thereof is added to the pyrithione-containing material. The discoloration is prevented without the addition of a cyclic organic phosphoric acid ester or an organic phosphite. Use of the discoloration inhibitor does not interfere with the antimicrobial effect of the pyrithione.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.