Washing compositions
US4269725A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1978 |
| Grant date | May 26, 1981 |
| Priority date | — |
| Expiry date | Apr 3, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D3/128
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides washing compositions in which all or part of the detergent builder salt is provided by a mixture of zeolites 13X and 4A. Preferably the weight ratio of 13X to 4A is in the range of 50:50 to 85:15 and especially from 65:35 to 85:15. Especially in the preferred ranges of weight ratios the mixtures are generally more effective at total hardness removal from the wash water than would be expected from the hardness removing capabilities of the zeolites 13X and 4A by themselves, leading to improved washing performance of the composition. In some particularly desirable embodiments part of the builder salt comprises STPP, and in others a minor part of the builder salt comprises a glassy phosphate, preferably together with an ethyleneamine (methylenephosphonic acid) complexing builder salt. The compositions of the present invention are suitable for cleaning, in particular, fabrics or hard surfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.