Foam inhibitors for aqueous systems and use thereof
AssigneeCiba-Geigy Corporation
InventorsHeinz Abel, Rosemarie Topfl
Life of this patent
Estimating the term…
Abstract
The invention relates to foam inhibitors comprising (1) (A) a reaction product of a polyol, an anhydride of an aliphatic C.sub.2 -C.sub.10 dicarboxylic acid and an adduct of a polyalkylene glycol and a fatty acid, or (B) a reaction product of a polyol, an anhydride of an aliphatic C.sub.2 -C.sub.10 dicarboxylic acid, a higher aliphatic alcohol and a polyethylene glycol, (2) a dialkyl ester of an unsaturated dicarboxylic acid, (3) a mineral oil, (4) a nonionic emulsifier, (5) an anionic emulsifier, and (6) an alkylene diamide, to liquid formulations of such foam inhibitors, and to a process for defoaming aqueous systems with the aid thereof.
Claims20
A foam inhibitor for aqueous systems, which comprises
- (1) 6 to 12% by weight of (A) a reaction product of a polyol, an anhydride of an aliphatic dicarboxylic acid of 2 to 10 carbon atoms and an adduct of a polyalkylene glycol and a fatty acid, or (B) a reaction product of a polyol, an anhydride of an aliphatic dicarboxylic acid of 2 to 10 carbon atoms, a higher aliphatic alcohol and a polyethylene glycol,
- (2) 20 to 50% by weight of a dialkyl ester of an unsaturated dicarboxylic acid,
- (3) 20 to 50% by weight of a mineral oil,
- (4) 5 to 10% by weight of a nonionic emulsifier,
- (5) 5 to 10% by weight of an anionic emulsifier, and
- (6) 0.5 to 1.5% by weight of an alkylene diamide.
A foam inhibitor formulation which is diluted with water or an organic solvent and which contains 1 to 99% of a foam inhibitor as claimed in any one of claims 1 to 18 and 99 to 1% of water or of an organic solvent.
Dependencies are inferred from the claim text.