US4767568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam inhibitors for aqueous systems and use thereof
Assignee: Novartis Corp
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Filing: 1986-06-19
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Granted: 1988-08-30
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Expires: 2006-06-19
Abstract
Abstract The invention relates to foam inhibitors comprising (1) (A) a reaction product of a polyol, an anhydride of an aliphatic C 2 -C 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 2 -C 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.
Inventors
- 👤 Heinz Abel
- 👤 Rosemarie Topfl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:23
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/64; D06P1/651; D06P1/6515; D06P1/65162; B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; D06P1/60; D06P1/613; D06P1/642; D06P1/649; D06P1/6495; D06P1/6497; D06P1/65106; D06P1/65125
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
131 words
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.
Claim 2
Dependent Claim
131 words
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.
Claim 3
Dependent Claim
79 words
A foam inhibitor according to claim 1, wherein component (1) is a propylene oxide adduct of (a) an at least trihydric aliphatic alcohol of 3 to 10 carbon atoms, (b) propylene oxide, (c) an aliphatic unsaturated dicarboxylic acid of 4 to 10 carbon atoms or the anhydride thereof, (d) a polyethylene glycol of formula HO--(CH 2 CH 2 O) n H, wherein n is an integer from 1 to 40, and (e) a C 16 -C 20 fatty acid.
Claim 4
Dependent Claim
18 words
A foam inhibitor according to claim 2, wherein component (a) is selected from glycerol, pentaerythritol, sorbitol or trimethylolpropane.
Claim 5
Dependent Claim
25 words
A foam inhibitor according to claim 2, wherein component (c) is the anhydride of an ethylenically unsaturated dicarboxylic acid of 4 to 10 carbon atoms.
Claim 6
Dependent Claim
13 words
A foam inhibitor according to claim 4, wherein component (c) is maleic anhydride.
Claim 7
Dependent Claim
29 words
A foam inhibitor according to claim 5, wherein component (d) is a polyethylene glycol of formula HO--(CH 2 CH 2 O) n H, wherein n is 4 to 34.
Claim 8
Dependent Claim
13 words
A foam inhibitor according to claim 6, wherein component (e) is stearic acid.
Claim 9
Dependent Claim
12 words
A foam inhibitor according to claim 7, wherein component (a) is pentaerythritol.
Claim 10
Dependent Claim
30 words
A foam inhibitor according to claim 1, wherein component (2) is a dialkyl ester of an ethylenically unsaturated dicarboxylic acid containing 2 to 12 carbon atoms in each alkyl moiety.
Claim 11
Dependent Claim
33 words
A foam inhibitor according to any one of claims 1 to 9, wherein component (2) is a dialkyl ester of maleic acid that contains 8 or 9 carbon atoms in each alkyl moiety.
Claim 12
Dependent Claim
41 words
A foam inhibitor according to any one of claims 1 to 9, wherein component (1) is an adduct of propylene oxide with pentaerythritol, propylene oxide, maleic anhydride, polyethylene glycol having an average molecular weight of 300 to 600, and stearic acid.
Claim 13
Dependent Claim
13 words
A foam inhibitor according to claim 11, wherein component (2) is di(2-ethyl-n-hexyl) maleate.
Claim 14
Dependent Claim
23 words
A foam inhibitor according to claim 12, wherein component (5) is a polyoxyethylene derivative of a fatty acid ester of a sorbitan ether.
Claim 15
Dependent Claim
15 words
A foam inhibitor according to claim 12, wherein component (4) is nonylphenol decaglycol ether phosphate.
Claim 16
Dependent Claim
19 words
A foam inhibitor according to claim 14, wherein component (6) is the reaction product of ethylenediamine and stearic acid.
Claim 17
Dependent Claim
51 words
A foam inhibitor according to any one of claims 1 to 15, which contains 7.0-9.0% by weight of component (1), 35.0-38.0% by weight of component (2), 35.0-38.0% by weight of component (3), 7.0-9.0% by weight of component (4), 7.0-9.0% by weight of component (5), and 0.5-1.5% by weight of component (6).
Claim 18
Dependent Claim
79 words
A foam inhibitor according to claim 1, wherein component (1) is a propylene oxide adduct of (a) an at least trihydric aliphatic alcohol of 3 to 10 carbon atoms, (b) propylene oxide, (c) an aliphatic unsaturated dicarboxylic acid of 4 to 10 carbon atoms or the anhydride thereof, (d) a polyethylene glycol of formula HO--(CH 2 CH 2 O) n H, wherein n is an integer from 1 to 40, and (f) a C 12 -C 18 fatty alcohol.
Claim 19
Dependent Claim
16 words
A foam inhibitor according to claim 17, wherein component (f) is stearyl alcohol or oleyl alcohol.
Claim 20
Dependent Claim
44 words
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.
Claim 21
Dependent Claim
35 words
A process for defoaming aqueous systems, which comprises adding to said aqueous system a foam inhibitor as claimed in any one of claims 1 to 18 or of a formulation as claimed in claim 19.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |