US 5,326,499 AGranted

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

AssigneeBASF SE

InventorsBrigitte Wegner, Knut Oppenlaender, Rudolf Schuhmacher, Andreas Hohmann, Gabriele Dralle-Vos

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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 (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 (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, (c) a hydrocarbon having a boiling point above 200.degree. C. or a fatty acid of 12 to 22 carbon atoms, in combination with (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.

Claims2

Dependent claims

A process, for preventing foam in pulp cooking, in the beating of paper stock, in paper making and in dispersing pigments for paper making, which comprises adding an effective amount of an antifoam, said antifoam being based on an oil-in-water emulsion in which the oil phase accounts for from 5 to 50% by weight of the emulsion and contains

(a) a member selected from the group consisting of 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 toms by the oxo synthesis or by the Ziegler method and which may be alkoxylated, and a mixture therein,
(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, optionally,
(c) a hydrocarbon having a boiling point above 200.degree. C. or a fatty acid of 12 to 22 carbon atoms, in combination with
(d) from 1 to 80% by weight of polyglyceryl esters which are obtainable by not less than 20% esterification of a polyglycerol mixture of
from 0 to 10% by weight of monoglycerol,
from 15 to 40% by weight of diglycerol,
from 30 to 55% by weight of triglycerol,
from 10 to 25% by weigth of tetraglycerol,
from 0 to 15% by weight of pentaglycerol,
from 0 to 10% by weight of hexaglycerol and
from 0 to 5% by weight of polyglycerols having higher degrees of condensation
with one or more fatty acids of 12 to 36 carbon atoms.

9 more elements

Dependencies are inferred from the claim text.