Process for manufacture of detergent powders
US4140650A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1977 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Nov 25, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D11/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to the preparation of spray-dried powders of low bulk density. Fabric washing powders containing nonionic surfactants as the major or sole detergent-active species have unacceptably high natural bulk densities (about 0.6 g/l). It has been found that the incorporation of certain alkenyl succinate salts into the crutcher slurry can reduce the bulk density of the resultant spray-dried powder. There is also a need for absorbents of low bulk density for manufacturing nonionic-surfactant based powders by dry-mixing routes and it has been found that suitable absorbents can be prepared by adding alkenyl succinate to a slurry of the chosen ingredients and spray-drying.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.