Patent US4332696A successfully refreshed from Google Patents.
US4332696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fatty epoxide hydrophobized silica as antifoams in brownstock washing aids
Assignee: ChampionX LLC
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Filing: 1980-05-27
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Granted: 1982-06-01
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Expires: 2000-05-27
Abstract
Abstract An improved aqueous defoamer composition of the type comprising from 70-90% by weight of a water-insoluble organic liquid, from 0.1 to about 20% of a hydrophobic silica suspended in the organic liquid, and from about 1 to about 20% of an oil-soluble spreading agent, the improvement which comprises utilizing as the hydrophobic silica a silica which has at least a portion of its surface esterified with a fatty epoxide. The invention also contemplates an improved method for hydrophobizing silica particles by reacting them in an organic liquid with a fatty epoxide.
Inventors
- 👤 Manuel Slovinsky
- 👤 Joseph A. Maciaszek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:27
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
36 words
A method of preparing a hydrophobic silica which comprises reacting a hydrophilic silica with at least 30% by weight of a fatty epoxide in an organic liquid for at least 2 hours at about 150° C.
Claim 2
Independent Claim
36 words
A method of preparing a hydrophobic silica which comprises reacting a hydrophilic silica with at least 30% by weight of a fatty epoxide in an organic liquid for at least 2 hours at about 150° C.
Claim 3
Dependent Claim
70 words
In an improved aqueous defoamer composition of the type comprising 70-98% by weight of a water-insoluble organic liquid, from 0.1 to about 20% of a hydrophobic silica suspended in the organic liquid, and from about 1 to about 20% of a oil-soluble spreading agent, the improvement which comprises utilizing as the hydrophobic silica a silica which had at least a portion of its surface esterified with an alpha-beta fatty epoxide.
Claim 4
Dependent Claim
70 words
In an improved aqueous defoamer composition of the type comprising 70-98% by weight of a water-insoluble organic liquid, from 0.1 to about 20% of a hydrophobic silica suspended in the organic liquid, and from about 1 to about 20% of a oil-soluble spreading agent, the improvement which comprises utilizing as the hydrophobic silica a silica which had at least a portion of its surface esterified with an alpha-beta fatty epoxide.
Claim 5
Dependent Claim
17 words
The composition of claim 2 wherein the alpha-beta fatty epoxide contains from 15 to 18 carbon atoms.
Claim 6
Dependent Claim
21 words
The method of defoaming aqueous systems which comprises adding to said systems a defoaming amount of the composition of claim 2.
Claim 7
Dependent Claim
21 words
The method of defoaming aqueous systems which comprises adding to said systems a defoaming amount of the composition of claim 3.
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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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |