Patent Number: 6,310,021

Title: Cleaning compositions containing enzymes and polycarboxylic ethers or thioethers

Abstract: A range of novel biodegradable aqueous acid cleaning systems for removing limescale from surfaces, especially stainless steel and porcelain surfaces, wherein said system comprises a biodegradable aqueous acid system, said system having a pH of less than 7.0, said system comprising at least one of the following acids: i) iminodiacetic acid; ii) aspartic acid; iii) derivatives selected from N-alkyl, N-alkylaryl and N-cycloaliphatic derivatives of iminodiacetic acid; iv) derivatives selected from N-alkyl, N-alkylaryl and N-cycloaliphatic derivatives of aspartic acid; and v) C.sub.2 -C.sub.10 polycarboxylic acids, said polycarboxylic acids containing a heteroatom in the main chain thereof, said heteroatom being selected from S, O and N; said system optionally comprising mixtures of said acids (i) to (v). The composition preferably comprises a surfactant to optimize the performance of said acid. Additional optional ingredients are selected from thickeners and co-builders and enzyme mixtures. There is also provided a method of removing limescale from surfaces employing such compositions.

Inventors: Callaghan; Ian C. (Wokingham, GB), Abamba; Grace (London, GB), Kinsley; Robert (Windlesham, GB), Moodycliffe; Timothy I. (Sunbury-on-Thames, GB), Woodbury; Richard P. (Amherst, NH)

Assignee: S. C. Johnson & Son, Inc.

International Classification: C11D 3/20 (20060101); C11D 3/37 (20060101); C11D 3/33 (20060101); C11D 3/38 (20060101); C11D 3/386 (20060101); C11D 3/26 (20060101); C11D 003/20 ()

Expiration Date: 10/30/2018