Method of producing detergents with lower levels of incrustation of salts on fabrics by incorporating therein only type A zeolite detergent builders having a certain determined rate constant
US4519933A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1983 |
| Grant date | May 28, 1985 |
| Priority date | — |
| Expiry date | Jun 7, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D3/128
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Type A, especially type 4A zeolites are well adapted as detergent builders, said zeolites comprising (i) primary particles having a mean particle diameter ranging from 0.1 to 10.mu., (ii) a cation exchange capacity in excess of about 100 mg CaCO.sub.3 /g of anhydrous material, and (iii) a rate constant, relative to the surface area of the zeolite per liter of wash solution, in excess of about 0.15 s.sup.-1 lm.sup.-2. The builders are prepared by first determining the value of the rate constant for a given zeolite sample. Since a higher rate constant value corresponds to a lower degree of salt incrustation on fabrics, only those zeolites having a value above the predetermined minimum will be incorporated into detergents. Thus, zeolites otherwise appearing identical can be differentiated, with only those not causing high levels of incrustation being selected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.