Process for preparing high bulk density detergent powders admixed with zeolite and coated with nonionic surfactant
US5030379A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1989 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Apr 28, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D3/128
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of a free-flowing detergent powder comprises the steps of (i) mixing a detergent base powder with finely divided zeolite in a weight ratio of the zeolite (hydrated basis) to the base powder of from 0.13:1 to 0.40:1, whereby the small zeolite particles are adhered to the outer surface of the larger base powder particles, and (ii) spraying a liquid composition comprising nonionic surfactant onto the mixture formed in step (i), at a weight ratio of nonionic surfactant to alkali metal aluminosilicate of at least 0.25:1. This improves flow properties, increases bulk density, and improves dispensing in an automatic washing machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.