US3671460A
Expired / Lapsed
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Defoaming compositions and methods of producing same
Assignee: Vista Chemical Co
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Filing: 1970-04-29
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Granted: 1972-06-20
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Expires: 1990-04-29
Abstract
Abstract A defoaming composition is produced by reacting a liquid hydrophobic polysiloxane oil with a hydrophilic alpha alumina monohydrate so as to produce a hydrophobic alumina reaction product. The reaction product is then dispersed in a hydrocarbon medium to produce the defoaming composition. The defoaming composition contains from about 1 to 40 percent by weight of the reaction produce and from about 60 to 99 percent by weight hydrocarbon medium.
Inventors
- 👤 Edwin M Hofgesang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:07
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
27 words
The composition of claim 1 wherein said liquid hydrophobic siloxane oil is an alkyl polysiloxane having a viscosity of from 40 to 1000 centistokes at 25* C.
Claim 2
Dependent Claim
63 words
The composition according to claim 2 wherein said alkyl polysiloxane is dimethylpolysiloxane, said hydrophilic alpha alumina monohydrate prior to coating with said siloxane oil has an average particle diameter of about 0.5 micron and a surface area of about 300 square meters per gram, and said organic hydrocarbon liquid is a paraffinic mineral oil having a viscosity of 100 SUS at 100* F.
Claim 3
Independent Claim
153 words
A method of preparing a defoaming composition which comprises (a) admixing a hydrophilic alpha alumina monohydrate with from about 0.1 to about 40 weight percent, based on the weight of said alpha alumina monohydrate, of a liquid hydrophobic siloxane oil having a viscosity of from about 10 to 3,000 centistokes at 25* C. and wherein said polysiloxane oil is selected from the group consisting of alkyl polysiloxanes, aryl polysiloxanes, aralkyl polysiloxanes and alicyclic polysiloxanes; (b) heating the mixture of step (a) to a temperature in the range of from about 150* to about 350* C. for an effective period of time to produce a hydrophobic alumina product; and, (c) admixing from about 1 to about 40 percent by weight of said hydrophobic alumina product with about 99 to about 60 weight percent of an organic hydrocarbon liquid having at least six carbon atoms and a minimum boiling point of at least 150* F.
Claim 4
Dependent Claim
36 words
The method of claim 4 wherein said heating of the mixture is carried out at a temperature within the range of about 200* to 225* C. for a period of from about 1 to 24 hours.
Claim 5
Dependent Claim
30 words
The method of claim 5 which includes the step of continuously agitating said mixture during the addition of said liquid hydrophobic siloxane oil and during said heating of said mixture.
Claim 6
Dependent Claim
45 words
The method of claim 5 which includes the step of homogenizing said reaction mixture under pressures of from about 10 pounds per square inch to about 8,000 pounds per square inch to facilitate dispersion of said defoaming composition into an aqueous system to be defoamed.
Claim 7
Dependent Claim
35 words
The method of claim 5 wherein said organic hydrocarbon liquid is selected from the group consisting of aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, and mixtures thereof, and contains from about six to 25 carbon atoms.
Claim 8
Dependent Claim
28 words
The method according to claim 8 wherein said liquid hydrophobic siloxane oil is an alkyl polysiloxane having a viscosity of from 40 to 1,000 centistokes at 25* C.
Claim 9
Dependent Claim
56 words
The method according to claim 9 wherein said alkyl polysiloxane is dimethylpolysiloxane, said hydrophilic alpha alumina monohydrate has an average particle diameter of about 0.5 micron and a surface area of about 300 square meters per gram, and said organic hydrocarbon liquid is a paraffinic mineral oil having a viscosity of 100 SUS at 100* F.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |