Colloid systems and wetting agents; subcombinations thereof; pro – Continuous liquid or supercritical phase: colloid systems;... – Aqueous continuous liquid phase and discontinuous phase...
Reexamination Certificate
1999-04-14
2002-10-29
Metzmaier, Daniel S. (Department: 1712)
Colloid systems and wetting agents; subcombinations thereof; pro
Continuous liquid or supercritical phase: colloid systems;...
Aqueous continuous liquid phase and discontinuous phase...
C516S053000, C516S072000, C516S129000, C516S132000, C516S134000, C510S421000, C510S470000, C510S506000, C510S535000
Reexamination Certificate
active
06472440
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to the reaction products of alkoxylated alcohols and epichlorohydrin and their use of alkoxylated alcohols to control foaming in surfactant compositions.
BACKGROUND OF THE INVENTION
Aqueous cleaning compositions exhibit a tendency toward foaming because they contain surface active agents such as soaps, and synthetic detergents. In many instances, such cleaning compositions produce excessive foam and the user must use substances known as add anti-foaming agents or defoamers. Some defoamers such as silicones tend to interfere with the function of the cleaning compositions in that unwanted residues are left after the cleaners are wiped off while others are environmentally unacceptable because they are not biodegradable.
Alkyl polyglycosides are a class of nonionic surfactants that exhibit significantly higher foaming profiles than other nonionic surfactants, such as alcohol ethoxylates. In fact, it can be said that the foaming tendencies of alkyl polyglycosides more closely resemble those of anionic surfactants, such as alcohol sulfates, than the foaming tendencies of other nonionic surfactants. This higher foaming tendency makes the use of alkyl polyglycosides undesirable for many applications, e.g. cleaning-in-place for food processing plants, high pressure spray cleaning, bottle washing, floor cleaners and automatic dishwashing, wherein high levels of foam interfere with the cleaning and rinsing operation and reduce the efficiency of the operation.
Low foam nonionics, such as EO/PO block copolymers, can be used to reduce the foaming properties of alkyl polyglycoside surfactants, but these materials have undesirable properties, e.g. low biodegradability, relatively high aquatic toxicity and poor caustic compatibility.
Accordingly, there is a need for the development of defoamers that do not interfere with the cleaning ability of aqueous cleaning compositions and that are biodegradable, exhibit low aquatic toxicity and good caustic compatibility.
SUMMARY OF THE INVENTION
The surprising discovery has been made that the products of the reaction of epichlorohydrin and compounds having the formula II
R
3
(EO)
n
(PO)
m
—OH (II)
wherein R
3
is an alkyl, alkenyl or arenyl group having from 4 to 22 carbon atoms; a substituted alkyl or alkenyl group having from 4 to 22 carbon atoms wherein; n is a number from0 to50 and m is a number from0 to 10; wherein the mole ratio of epichlorohydrin to (II) is from about 0.60/1 to about 2/1 are extremely efficient defoamers for aqueous surfactant systems. These reaction products are added to a surfactant in an amount sufficient to reduce or eliminate foam. The reaction products have the advantage of being totally dispersible in water, are readily biodegradable, contain no organic solvents and do not affect the detergency of surfactants with which they are used because they are nonionic surfactants in themselves.
REFERENCES:
patent: 2572886 (1951-10-01), DeGroote et al.
patent: 3623988 (1971-11-01), Weimer
patent: 3671458 (1972-06-01), Sherman et al.
patent: 4077894 (1978-03-01), Langdon et al.
patent: 4086279 (1978-04-01), Langdon et al.
patent: 4098713 (1978-07-01), Jones
patent: 4310698 (1982-01-01), Cooke
patent: 4375565 (1983-03-01), Greif et al.
patent: 4677232 (1987-06-01), Sebag et al.
patent: 4963535 (1990-10-01), Sebag et al.
patent: 4978805 (1990-12-01), Baur et al.
patent: 5370816 (1994-12-01), Balzer et al.
patent: 5478562 (1995-12-01), Cauwet et al.
patent: 5573707 (1996-11-01), Cole et al.
patent: 5599787 (1997-02-01), Schmid et al.
patent: 5728895 (1998-03-01), Wiggins et al.
patent: 5827453 (1998-10-01), Gross et al.
patent: 5895605 (1999-04-01), Gross et al.
patent: 6110977 (2000-08-01), Gross et al.
Fessenden & Fessenden, Organic Chemistry, (Willard Grant Press, Boston, Ma Copyright 1979) pp. 165-167, 207 and 283, Aug. 1980.
Database DWPI on WEST, week 198625, London: Derwent Publications Ltd., AN 1986-157518, FR 2574786 A (L'Oreal), abstract, 1986.
Broadbent Ronald W.
Devore David I.
Gross Stephen F.
Wiggins Michael S.
Cognis Corporation
Drach John E.
Metzmaier Daniel S.
Millson, Jr. Henry E.
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