Encapsulated enzyme in dry bleach composition
US5167854A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1989 |
| Grant date | Dec 1, 1992 |
| Priority date | — |
| Expiry date | Sep 1, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D17/041
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a bleaching composition containing an oxidant bleach and enzyme granules, in which enzyme stability is prolonged without undue loss of solubility despite intimate contact of said enzyme granules and said oxidant bleach, comprising: PA0 an oxidant bleach, selected from the group consisting of alkali-metal peroborates, alkali metal percarbonates, hydrogen peroxide adducts, and mixtures thereof and hydrolase enzyme granules comprising a hydrolase enzyme core and a water soluble alkali metal silicate coating substantially encapsulating said core, said coating including at least one protective agent, said agent being selected from the group consisting of transition metals; reducing agents; and mixtures thereof. Sodium percarbonate is a preferred oxidant, while transition metals combined with a sodium silicate coating provide enhanced storage stability to the enzymes thereby coated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.