Defoaming and deaerating mixtures for aqueous media prone to foaming

US5744066A · kind A · utility

Assignee

• BASF SE

Inventors

• Knut Oppenlander · Ludwigshafen, DE
• Gabriele Dralle-Voss · Darmstadt, DE
• Rudolf Schuhmacher · Böhl-Iggelheim, DE

Key dates

• Filing date: Mar 7, 1996
• Grant date: Apr 28, 1998
• Expiry date: Mar 7, 2016

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H21/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Defoaming and deaerating mixtures based on oil-in-water emulsions where the oil phase comprises from 5 to 75% by weight of the emulsion for aqueous media prone to foaming, wherein the oil phase comprises PA1 a) at least one alcohol having at least 12 carbon atoms, distillation residues obtainable in the course of the production of alcohols having a higher carbon number by the oxo process or by the Ziegler process, or mixtures thereof, PA1 b) at least one ester of a sugar alcohol having at least 4 OH groups or at least 2 OH groups and at least one intramolecular ether bond and a fatty acid having at least 20 carbon atoms in a molar ratio of 1:at least 1, in which case the free OH groups of these esters are optionally wholly or partly esterified with C.sub.12 -C.sub.18 -carboxylic acids, and optionally PA1 c) fatty acid esters of alcohols having at least 22 carbon atoms and C.sub.1 -C.sub.36 -carboxylic acids, fatty acid esters of C.sub.12 -C.sub.22 -carboxylic acids and monohydric, dihydric or trihydric C.sub.1 -C.sub.20 -alcohols, polyethylene waxes, natural waxes or mixtures thereof, and optionally PA1 d) hydrocarbons having a boiling point above 200.degree. C., fatty acids having…