US4082691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organo silicon/silica defoamer compositions
Assignee: Witco Corp
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Filing: 1976-11-24
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Granted: 1978-04-04
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Expires: 1996-11-24
Abstract
Abstract A defoamer composition comprising a precipitated hydrophylic silica suspended in a water-immiscible inert liquid carrier, and reacted in situ with specific molar proportions of a trichloro-organosilane and a dichloro-organosilane, preferably in this respective order, to yield a stable hydrophobic silica suspension in an inert carrier, useful as a defoaming agent for aqueous systems, being effective at concentrations as low as 0.0005 percent. When one of said chloro-organosilanes contains an unsaturated bond, the composition may be further halogenated or sulfated.
Inventors
- 👤 Paul Daniel Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:27
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
A defoamer silica composition comprising about 1-15% of a hydrophobic precipitated silica in a water-immiscible inert liquid carrier, said hydrophobic silica having been rendered hydrophobic by reaction of a hydrophylic precipitated silica in said suspension with a trichloro-organosilane and a dichloro-organosilane, and adding each of said chlorosilanes in an amount in the range of 10-50% based on the silica and in a molecular proportion of 1:1 to 1:5 respectively.
Claim 2
Dependent Claim
69 words
A defoamer silica composition comprising about 1-15% of a hydrophobic precipitated silica in a water-immiscible inert liquid carrier, said hydrophobic silica having been rendered hydrophobic by reaction of a hydrophylic precipitated silica in said suspension with a trichloro-organosilane and a dichloro-organosilane, and adding each of said chlorosilanes in an amount in the range of 10-50% based on the silica and in a molecular proportion of 1:1 to 1:5 respectively.
Claim 3
Dependent Claim
19 words
A defoamer composition as in claim 1 wherein the trichlorosilane is octadecyl trichlorosilane and the dichlorosilane is dimethyl dichlorosilane.
Claim 4
Dependent Claim
19 words
A defoamer composition as in claim 1 wherein the trichlorosilane is methylstearyl trichlorosilane and the dichlorosilane is dimethyl dichlorosilane.
Claim 5
Dependent Claim
20 words
A defoamer composition as in claim 1, wherein the trichlorosilane is octadecyl trichlorosilane and the dichlorosilane is methyl vinyl dichlorosilane.
Claim 6
Dependent Claim
24 words
A defoamer composition as in claim 1 wherein the molecular proportion of trichlorosilane to dichlorosilane is in the range of 1:2 to 1:4, respectively.
Claim 7
Dependent Claim
18 words
A defoamer as in claim 1 wherein the molecular proportion of trichlorosilane and dichlorosilane is about 1:3, respectively.
Claim 8
Dependent Claim
17 words
A defoamer composition as in claim 1 wherein the water-immiscible inert liquid carrier is a mineral oil.
Claim 9
Dependent Claim
21 words
A defoamer composition as in claim 1 wherein an emulsifier is present in an amount of from about 0.5 to 15%.
Claim 10
Dependent Claim
16 words
A defoamer as in claim 8 wherein said emulsifier is a polyethylene glycol fatty acid ester.
Claim 11
Dependent Claim
14 words
A defoamer composition as in claim 9, wherein said emulsifier is polyethylene glycol-400 ditallate.
Claim 12
Dependent Claim
12 words
A defoamer composition as in claim 4, further sulfated with sulfuric acid.
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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |