Antifoams for the paper industry, based on oil-in-water emulsions

US5326499A · kind A · utility

Assignee

• BASF SE

Inventors

• Brigitte Wegner · Speyer, DE
• Knut Oppenlaender · Ludwigshafen, DE
• Rudolf Schuhmacher · Böhl-Iggelheim, DE
• Andreas Hohmann · Ludwigshafen, DE
• Gabriele Dralle-Vos · Ludwigshafen, DE

Key dates

• Filing date: Aug 20, 1992
• Grant date: Jul 5, 1994
• Expiry date: Aug 20, 2012

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H17/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Antifoams for the paper industry are based on oil-in-water emulsions in which the oil phase accounts for from 5 to 50% by weight of the emulsion and contains PA0 (a) an alcohol of not less than 12 carbon atoms, fatty esters of alcohols of not less than 22 carbon atoms and C.sub.1 -C.sub.36 -carboxylic acids, distillation residues which are obtainable in the preparation of alcohols having a relatively large number of carbon atoms by the oxo synthesis or by the Ziegler method and which may be alkoxylated, a mixture of the stated compounds and/or PA0 (b) a fatty ester of a C.sub.12 -C.sub.22 -carboxylic acid with a monohydric to trihydric C.sub.1 -C.sub.18 -alcohol and, if required, PA0 (c) a hydrocarbon having a boiling point above 200.degree. C. or a fatty acid of 12 to 22 carbon atoms, in combination with PA0 (d) from 1 to 80% by weight of polyglyceryl esters which can be prepared by not less than 20% esterification of a polyglycerol mixture which contains, as essential components, di-, tri- and tetraglycerol and, if required, polyglycerols having higher degrees of condensation with saturated or unsaturated C.sub.12 -C.sub.36 -fatty acids.