Patent · US Expired

Phosphate-free detergent having a reduced tendency towards incrustation

US4919845A · kind A · utility

36Cited by

12References

10Claims

0Family size

Assignee

Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

Guenther Vogt · Tönisvorst, DE
Hans Andree · Leichlingen, DE
Gertrud Nienhaus · Goldkronach, DE

Key dates

Filing date	Jul 7, 1989
Grant date	Apr 24, 1990
Priority date	—
Expiry date	Jul 7, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC11D3/3761
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A detergent composition containing by weight (a) from 5 to 35% of an anionic or nonionic surfactant, (b) from 10 to 40% of finely crystalline zeolite, (c) from 4 to 20% of alkali metal silicate or carbonate and from 0.1 to 5% of (d) aminoalkanephosphonate or (d2) copolymer of (meth)acrylic acid and maleic acid and (e) from 5 to 80% of other detergent constituents is considerably improved in regard to its incrustation-inhibiting properties if it additionally contains (f) from 0.05 to 1% (based on the free acid) of 1-hydroxyethane-1,1-diphosphonic acid in the form of its alkali metal salt. The weight ratio of (d1) to (f) is from 3:1 to 1:6 and of (d2) to (f) is from 40:1 to 2:1.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.