Method and product for enhanced bleaching with in situ peracid formation
US5505740A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1993 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | Sep 9, 2013 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06L4/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A bleaching product and a method of removing soils from fabrics by contacting the fabrics in an aqueous wash solution with a product comprising a peracid precursor, a source of hydrogen peroxide and a source for delayed release of an acid into the wash solution to initially permit effective in situ formation of peracid, the acid thereafter reducing the pH of the wash solution for enhancing bleach performance of the peracid. The source of the acid may be included in the bleaching product, for example, as an acid of delayed solubility, an acid coated with a low solubility agent or an acid generating species, or independent of the bleaching product. The acid source is selected to be compatible with the peracid or precursor and adjuncts. The method for removing soils thus comprises contacting the fabrics in an aqeuous solution with a peracid precursor and a source of hydrogen peroxide, initially raising the pH of the solution for effective in situ formation of peracid and then reducing the pH for enhancing bleach performance of the peracid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.