Patent US5861089A successfully refreshed from Google Patents.
US5861089A
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Electric field enhanced coalescence of emulsions comprising a silicon containing compound or silicon containing polymer
Assignee: Dow Silicones Corp
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Filing: 1996-11-12
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Granted: 1999-01-19
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Expires: 2016-11-12
Abstract
Abstract A process for separating an emulsion into separate and easily recoverable phases. The process comprises exposing an emulsion comprising a discontinuous phase and a non-conducting continuous phase to an electric field thereby effecting coalescence of the discontinuous phase into droplets of a size for effective gravitation from the continuous phase, where the discontinuous phase and the continuous phase have different dielectric constants and densities and at least one of the phases comprise a silicon containing compound or a silicon containing polymer. The present process is especially useful for separating emulsions where the discontinuous phase is an aqueous acid solution and the continuous phase is diorganopolysiloxane.
Inventors
- 👤 Christopher Darren Gatti
- 👤 Charles Alan Hall
- 👤 Roland Lee Halm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:03
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; B; B01; B01D; B01D17/00; B01D17/06; B03; B03C; B03C11/00; B03C2201/00; B03C2201/02; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
73 words
A process for separating an emulsion, the process comprising: exposing an emulsion comprising a discontinuous phase and a non-conducting continuous phase to an electric field effecting coalescence of the discontinuous phase into droplets of a size for effective gravitation from the continuous phase, where the continuous phase and the discontinuous phase have different dielectric constants and densities and at least one of the phases comprises a silicon containing compound or silicon containing polymer.
Claim 2
Dependent Claim
73 words
A process for separating an emulsion, the process comprising: exposing an emulsion comprising a discontinuous phase and a non-conducting continuous phase to an electric field effecting coalescence of the discontinuous phase into droplets of a size for effective gravitation from the continuous phase, where the continuous phase and the discontinuous phase have different dielectric constants and densities and at least one of the phases comprises a silicon containing compound or silicon containing polymer.
Claim 3
Dependent Claim
23 words
A process according to claim 1, where the electric field is created by an alternating current potential applied to one or more electrodes.
Claim 4
Dependent Claim
23 words
A process according to claim 1, where the electric field is created by a direct current potential applied to one or more electrodes.
Claim 5
Dependent Claim
20 words
A process according to claim 1, where the continuous phase comprises a silicon containing compound or a silicon containing polymer.
Claim 6
Dependent Claim
52 words
A process according to claim 1, where the continuous phase is a silane described by formula R.sup.1.sub.a H.sub.b SiX.sub.4-a-b, where each R 1 is an independently selected monovalent hydrocarbon radical comprising 1 to about 12 carbon atoms, X is a halogen atom, a=0 to 4, b=0 to 2, and a+b=0 to 4.
Claim 7
Dependent Claim
15 words
A process according to claim 5, where R 1 is methyl and X is chlorine.
Claim 8
Dependent Claim
77 words
A process according to claim 1, where the continuous phase is a linear siloxane described by formula R.sup.2 R.sup.3.sub.2 O(SiR.sup.3 O).sub.z SiR.sup.3.sub.2 R.sup.2, where each R 2 is independently selected from the group consisting of halogen, hydroxy, and R 3 ; each R 3 is independently selected from the group consisting of hydrogen and monovalent hydrocarbon radicals comprising 1 to about 12 carbon atoms and z is a value within a range of 0 to about 100,000.
Claim 9
Dependent Claim
28 words
A process according to claim 7, where R 2 is methyl, R 3 is methyl, and z is a value within a range of 0 to about 200.
Claim 10
Dependent Claim
55 words
A process according to claim 1, where the continuous phase is a cyclic siloxane described by formula ##STR2## where each R 3 is independently selected from the group consisting of hydrogen and monovalent hydrocarbon radicals comprising 1 to about 12 carbon atoms and m is a value within a range of 3 to about 20.
Claim 11
Dependent Claim
25 words
A process according to claim 9, where each R 3 is methyl and m is a value within a range of 3 to about 7.
Claim 12
Dependent Claim
65 words
A process according to claim 1, where the continuous phase is a silicone resin formed of units described by formulas R 3 3 SiO 1/2 , R 3 2 SiO 2/2 , R 3 SiO 3/2 , and SiO 4/2 , where each R 3 is independently selected from the group consisting of hydrogen and monovalent hydrocarbon radicals comprising 1 to about 12 carbon atoms.
Claim 13
Dependent Claim
57 words
A process according to claim 1, where the continuous phase is a polysilane described by formula R.sup.4.sub.3 Si(SiR.sup.4.sub.2).sub.n SiR.sup.4.sub.3, where each R 4 is independently selected from the group consisting of hydrogen, halogen, and monovalent hydrocarbon radicals comprising 1 to about 12 carbon atoms and n is a value within a range of 0 to about 1,000.
Claim 14
Dependent Claim
12 words
A process according to claim 1, where the discontinuous phase is water.
Claim 15
Dependent Claim
14 words
A process according to claim 1, where the discontinuous phase is an aqueous acid.
Claim 16
Dependent Claim
14 words
A process according to claim 1, where the discontinuous phase is aqueous hydrogen chloride.
Claim 17
Dependent Claim
46 words
A process according to claim 1, where the continuous phase is a polydimethylsiloxane prepared by the hydrolysis of methylchlorosilanes, the discontinuous phase is aqueous hydrogen chloride, and water is added to the process to facilitate reduction of residual chlorine bonded to silicon atoms of the polydimethylsiloxane.
Claim 18
Dependent Claim
24 words
A process according to claim 1, where the electric field is created by a pulsed direct current potential applied to one or more electrodes.
Claim 19
Dependent Claim
30 words
A process according to claim 1, where the electric field is created by an electric potential having both alternating current and direct current characteristics applied to one or more electrodes.
Claim 20
Dependent Claim
59 words
A process for separating an emulsion, the process comprising exposing an emulsion comprising a discontinuous aqueous phase and a non-conducting continuous phase comprising a silicon containing compound or a silicon containing polymer to an electric field effecting coalescence of the aqueous phase into droplets of a size for effective gravitation from the silicon containing compound or silicon containing polymer.
Claim 21
Dependent Claim
59 words
A process for separating an emulsion, the process comprising exposing an emulsion comprising a discontinuous aqueous phase and a non-conducting continuous phase comprising a silicon containing compound or a silicon containing polymer to an electric field effecting coalescence of the aqueous phase into droplets of a size for effective gravitation from the silicon containing compound or silicon containing polymer.
Claim 22
Dependent Claim
59 words
A process for dehydrating a silicone polymer, the process comprising passing an emulsion comprising a discontinuous aqueous phase and a continuous phase comprising a polydiorganosiloxane through an electric field having an alternating current field component and a direct current field component, thereby effecting coalescence of the aqueous phase into droplets of a size sufficient for gravitation from the polydiorganosiloxane.
Claim 23
Dependent Claim
59 words
A process for dehydrating a silicone polymer, the process comprising passing an emulsion comprising a discontinuous aqueous phase and a continuous phase comprising a polydiorganosiloxane through an electric field having an alternating current field component and a direct current field component, thereby effecting coalescence of the aqueous phase into droplets of a size sufficient for gravitation from the polydiorganosiloxane.
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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) | 2002-01-18 | 2002-07-20 | 2003-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-18 | 2006-07-20 | 2007-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-18 | 2010-07-20 | 2011-01-19 | $7700.00 | Window Closed / Lapsed |