Prevention of foam in alkaline cleansing bath by the use of mixed formals of polyglycol ethers

US4364777A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien (Henkel KGAA) · DE

Inventors

• Margarete Grunert · Kaarst, DE
• Karl Schmid · Mettmann, DE
• Holger Tesmann · Düsseldorf, DE

Key dates

• Filing date: Apr 27, 1981
• Grant date: Dec 21, 1982
• Expiry date: Apr 27, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D3/0026
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An alkaline washing composition comprised of strongly alkaline reacting inorganic salts, optionally wetting agents and a defoaming effective amount of at least one mixed formal of an alkylpolyglycol ether having the formula: EQU R.sub.1 --O--(CH.sub.2 CH.sub.2 O).sub.m --CH.sub.2 --(OCH.sub.2 CH.sub.2).sub.n --O--R.sub.2 wherein R.sub.1 is a straight or branched chain alkyl or alkenyl with from 8 to 22 carbon atoms, R.sub.2 is a straight or branched chain alkyl with from 1 to 5 carbon atoms, m is a number from 2 to 30 and n is a number from 1 to 3; as well as the improvement in the process of washing rigid solid articles comprising contacting the soiled rigid solid articles with a strongly alkaline washing solution containing a defoaming effective amount of a defoaming agent, rinsing said rigid solid articles and recovering cleaned rigid solid articles, the improvement consisting of using said mixed formal as said defoaming agent.