US4021365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica base defoamer compositions with improved stability
Assignee: Diamond Shamrock Corp
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Filing: 1975-07-18
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Granted: 1977-05-03
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Expires: 1995-07-18
Abstract
Abstract Defoamer compositions having improved stability are prepared from hydrophobic silica, quick-chilled amides, and hydrocarbon oil, with oil soluble organic polymers and surface-active additives as optional ingredients. These compositions are useful in defoaming aqueous systems including paper pulp black liquors, water-base paints, and adhesives.
Inventors
- 👤 Joseph V. Sinka
- 👤 Irwin A. Lichtman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:10
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; C; C09; C09D; C09D7/00; C09D7/40; C09D7/60; C09D7/63; C08; C08K; C08K5/00; C08K5/16; C08K5/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
49 words
In an aqueous system defoamer composition containing from 3 to 20% by weight of hydrophobic silica suspended in a carrier liquid, the improvement comprising the addition of a quick-chilled amide in a quantity of from 0.1 to 2.0% by weight so that the hydrophobic silica/carrier liquid suspension is stabilized.
Claim 2
Dependent Claim
49 words
In an aqueous system defoamer composition containing from 3 to 20% by weight of hydrophobic silica suspended in a carrier liquid, the improvement comprising the addition of a quick-chilled amide in a quantity of from 0.1 to 2.0% by weight so that the hydrophobic silica/carrier liquid suspension is stabilized.
Claim 3
Dependent Claim
20 words
The improvement of claim 1 with the addition of up to 25% by weight of an oil soluble organic polymer.
Claim 4
Dependent Claim
18 words
The improvement of claim 1 with the addition of up to 3.0% by weight of a surface-active additive.
Claim 5
Dependent Claim
20 words
The improvement of claim 1 in which the quick-chilled amide is the reaction product of ethylenediamine and tallow fatty acid.
Claim 6
Dependent Claim
25 words
The improvement of claim 1 in which the hydrophobic silica has an oil absorption value of more than 170 grams per 100 grams of silica.
Claim 7
Dependent Claim
14 words
The improvement of claim 1 in which the carrier liquid is paraffinic mineral oil.
Claim 8
Dependent Claim
26 words
The improvement of claim 2 in which the oil soluble organic polymer is a copolymer of vinyl acetate and fumaric acid esterified with a tallow alcohol.
Claim 9
Dependent Claim
20 words
The improvement of claim 2 in which the oil soluble organic polymer is a copolymer of styrene and a polyester.
Claim 10
Dependent Claim
21 words
The improvement of claim 2 in which the oil soluble organic polymer is a copolymer of alkyl methacrylate and N-vinyl pyrrolidone.
Claim 11
Dependent Claim
106 words
A process of manufacturing a hydrophobic silica base defoamer having improved stability comprising: heating a carrier liquid to at least 100° C.; adding hydrophobic silica thereto and blending, so as to form a temporarily stable suspension; cooling the suspension to about room temperature or below; heating separately an amide optionally mixed with carrier liquid until the amide is melted or dissolved in the carrier liquid; maintaining the temperature of the amide for at least 15 minutes; rapidly adding the amide to the suspension so as to quick-chill the amide; and homogenizing the hydrophobic silica/carrier liquid/quick-chilled amide mixture at a pressure of from 1,000 to 5,000 p.s.i.
Claim 12
Dependent Claim
106 words
A process of manufacturing a hydrophobic silica base defoamer having improved stability comprising: heating a carrier liquid to at least 100° C.; adding hydrophobic silica thereto and blending, so as to form a temporarily stable suspension; cooling the suspension to about room temperature or below; heating separately an amide optionally mixed with carrier liquid until the amide is melted or dissolved in the carrier liquid; maintaining the temperature of the amide for at least 15 minutes; rapidly adding the amide to the suspension so as to quick-chill the amide; and homogenizing the hydrophobic silica/carrier liquid/quick-chilled amide mixture at a pressure of from 1,000 to 5,000 p.s.i.
Claim 13
Dependent Claim
17 words
A process according to claim 10 in which an oil soluble organic polymer is added after homogenization.
Claim 14
Dependent Claim
15 words
A process according to claim 10 in which a surface-active agent is added after homogenization.
Claim 15
Dependent Claim
40 words
A method of defoaming black liquor present in paper manufacture comprising adding thereto from about 0.003 to about 0.5 parts by weight of the solids of the composition of claim 1 per 100 parts by weight of dry paper pulp.
Claim 16
Dependent Claim
29 words
A method of foam prevention in water-base paints comprising incorporating therein from about 1.2 grams to about 6.0 grams of the composition of claim 1 per liter of paint.
Claim 17
Dependent Claim
35 words
A method of foam prevention in water base adhesives comprising incorporating therein from about 0.05 to about 0.5 parts by weight of the composition of claim 1 per 100 parts by weight of adhesive solids.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |