US4690713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antifoam composition
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1985-01-24
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Granted: 1987-09-01
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Expires: 2005-01-24
Abstract
Abstract The antifoam composition provided by the invention comprises (a) 100 parts by weight of a hydrocarbon oil, e.g. spindle oil, or a silicone fluid, e.g. polydimethylsiloxane fluid, having a viscosity of 20 to 1,000,000 centistokes at 25 DEG C., (b) 0.1 to 40 parts by weight of an organosilane compound having 1 to 3 hydroxy groups or hydrolyzable groups, e.g. alkoxy, acyloxy and alkenyloxy groups, (c) 1 to 40 parts by weight of a finely divided silica powder and, optionally, (d) up to 5 parts by weight of a catalyst. The antifoam composition can exhibit excellent and durable defoaming activity even under vigorous agitation or in an alkaline condition of the foaming liquid.
Inventors
- 👤 Nobuyuki Terae
- 👤 Masaaki Yamaya
- 👤 Fumio Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:22
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
An antifoam composition which comprises: (a) 100 parts by weight of a hydrophobic base fluid selected from the class consisting of hydrocarbon oils and organopolysiloxane fluid having a viscosity in the range from 20 to 1,000,000 centistokes at 25° C.; (b) from 0.1 to 40 parts by weight of an organosilicon compound represented by the general formula R 1 a Y b Si, in which R 1 is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, Y is a monovalent group selected from the class consisting of alkoxy groups, acyloxy groups and alkenyloxy groups having 1 to 6 carbon atoms and a hydroxy group and the suffixes a and b are each a positive integer of 1, 2 or 3 with the proviso that a+b=4; (c) from 1 to 40 parts by weight of a finely divided silica powder; and (d) up to 5 parts by weight of a catalyst.
Claim 2
Dependent Claim
155 words
An antifoam composition which comprises: (a) 100 parts by weight of a hydrophobic base fluid selected from the class consisting of hydrocarbon oils and organopolysiloxane fluid having a viscosity in the range from 20 to 1,000,000 centistokes at 25° C.; (b) from 0.1 to 40 parts by weight of an organosilicon compound represented by the general formula R 1 a Y b Si, in which R 1 is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, Y is a monovalent group selected from the class consisting of alkoxy groups, acyloxy groups and alkenyloxy groups having 1 to 6 carbon atoms and a hydroxy group and the suffixes a and b are each a positive integer of 1, 2 or 3 with the proviso that a+b=4; (c) from 1 to 40 parts by weight of a finely divided silica powder; and (d) up to 5 parts by weight of a catalyst.
Claim 3
Dependent Claim
16 words
The antifoam composition as claimed in claim 1 wherein the hydrocarbon oil is a spindle oil.
Claim 4
Dependent Claim
53 words
The antifoam composition as claimed in claim 1 wherein the organopolysiloxane fluid is a compound expressed by the average unit formula ##STR3## in which R 2 is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms and c is a positive number in the range from 1.9 to 2.1.
Claim 5
Dependent Claim
16 words
The antifoam composition as claimed in claim 1 wherein the organopolysiloxane fluid is a polydimethylsiloxane fluid.
Claim 6
Dependent Claim
27 words
The antifoam composition as claimed in claim 1 wherein the hydrophobic base fluid has a viscosity in the range from 50 to 10,000 centistokes at 25° C.
Claim 7
Dependent Claim
35 words
The antifoam composition as claimed in claim 1 wherein the catalyst is selected from the class consisting of dibutyltin diacetate, dibutyltin dilaurate, dioctyltin dilaurate, dibutyltin dioctoate, tin caprylate, zirconium naphthenate, manganese naphthenate and tetrabutyl titanate.
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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) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |