Defoaming agent for the paper industry based on oil in water...

D - Textiles – Paper – 21 – H

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D21H 21/12 (2006.01) D21C 3/28 (2006.01) D21H 17/14 (2006.01)

Patent

CA 2141576

Antifoams based on oil-in- water emulsions, in which the oil phase accounts for from 5 to 50% by weight of the emulsions and consists essen- tially of a mixture of (a) fatty esters of C12-C22-carboxylic acids with mono- hydric to trihydric C1-C22-alcohols, (b) polyglyceryl esters which are obtainable by at least 20% esterification of polyglycerols which contain at least 2 glyceryl units with at least one C12-C36- fatty acid and (c) fatty esters of C12-C22-carboxylic acids and poly- alkylene glycols, the molecular weight of the poly- alkylene glycols being up to 5,000 g/mol, and, if required, (d) long-chain alcohols, fatty esters of alcohols of at least 22 carbon atoms and C1-C36-carboxylic acids, distillation residues which are obtainable in the preparation of alcohols having a relatively large number of carbon atoms by oxo synthesis or by the Ziegler process and which may be alkoxylated, and/or e) hydrocarbons having a boiling point above 200°C or fatty acids of 12 to 22 carbon atoms, are used for controlling foam in pulp digestion, in the beating of paper stock, in papermaking and in the dis- persing of pigments for papermaking.

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