Stabilized bleach-sensitive dyes in automatic dishwasher detergent compositions
US4464281A · kind A · utility
22Cited by
12References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1983 |
| Grant date | Aug 7, 1984 |
| Priority date | — |
| Expiry date | Jul 28, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D3/40
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for stabilizing automatic dishwasher detergents containing bleach-sensitive dyes against decolorization by the bleaching agents of the compositions. The detergent powders comprise about 5-70% of a builder, 1-15% of a nonionic surfactant, 1-20% of a silicate, 0-60% of a filler, 0.001-0.1% of a bleach-sensitive dye, water and a bleaching agent. Prior to the addition of bleaching agent, the composition is pre-conditioned by contact with a flow of air. The resultant powder has a color that remains essentially unchanged even after storage for two months at elevated temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.