EP0200916A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Emulsification process and emulsions therefrom
Assignee: Dow Silicones Corp
•
Filing: 1986-04-01
•
Granted: —
•
Expires: 2006-04-01
Abstract
Abstract Oil-in-water emulsions are provided by a process which involves the mixing of the oil and water in the presence of three nonionic surfactants. The process is particularly useful for emulsifying an oil having a viscosity exceeding 50,000 centipoise (50 pascal-seconds). Any oil can be emulsified by this process, including hydrocarbon oils like mineral oil and petrolatum, and silicones. A particularly useful emulsion prepared by this process is an emulsion of a bi-modal silicone which contains substantial amounts of a volatile silicone and a silicone gum.
Inventors
- 👤 Dipak Narula
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 04:55
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/40; A; A61; A61Q; A61Q19/00; A61K; A61K8/00; A61K8/02; A61K8/04; A61K8/06; A61K8/062; A61K8/18; A61K8/72; A61K8/84; A61K8/89; A61K8/891; C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; A61Q15/00; C08J2383/00; C08J2383/04; C08J2391/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
A process for preparing an oil-in-water emulsion, said process comprising mixing an aqueous phase consisting essentially of at least 10 parts by weight of water and an oil phase consisting essentially of 100 parts by weight of a water-insoluble oil until the oil-in-water emulsion has been formed, said aqueous phase and/or said oil phase further containing, in total, at least 3 millimols of a nonionic primary surfactant having an HLB number of from 13 to 15, from 1 to 5 millimols, per millimol of said nonionic primary surfactant, of a nonionic secondary surfactant having an HLB number of from 7 to 9 and at least 0.05 millimol of a nonionic tertiary surfactant having an HLB number of at least 16.
Claim 2
Dependent Claim
120 words
A process for preparing an oil-in-water emulsion, said process comprising mixing an aqueous phase consisting essentially of at least 10 parts by weight of water and an oil phase consisting essentially of 100 parts by weight of a water-insoluble oil until the oil-in-water emulsion has been formed, said aqueous phase and/or said oil phase further containing, in total, at least 3 millimols of a nonionic primary surfactant having an HLB number of from 13 to 15, from 1 to 5 millimols, per millimol of said nonionic primary surfactant, of a nonionic secondary surfactant having an HLB number of from 7 to 9 and at least 0.05 millimol of a nonionic tertiary surfactant having an HLB number of at least 16.
Claim 3
Dependent Claim
24 words
A process according to claim 1 wherein the water-insoluble oil comprises a polydimethylsiloxane fluid having a viscosity of at least 30 pascal-seconds at 25°C.
Claim 4
Dependent Claim
71 words
A process according to claim 2 wherein the polydimethylsiloxane fluid consists essentially of (i) 10 to 50 percent by weight, based on the weight of the polydimethylsiloxane fluid, of a nonvolatile polydimethylsiloxane portion having a viscosity at 25°C of at least 10 kilopascal-seconds, and (ii) 50 to 90 percent by weight, on the same basis, of a volatile polydimethylsiloxane portion selected from cyclopolydimethylsiloxanes having 4 and 5 silicon atoms per molecule.
Claim 5
Dependent Claim
35 words
A process according to claim 3 wherein the oil phase contains all of the nonionic primary surfactant and all of the nonionic secondary surfactant and the aqueous phase contains all of the nonionic tertiary surfactant.
Claim 6
Dependent Claim
83 words
An oil-in-water emulsion consisting essentially of 100 parts by weight of a water-insoluble oil, at least 0.05 millimol of a nonionic tertiary surfactant having an HLB number of at least 16, at least 3 millimols of a nonionic primary surfactant having an HLB number of from 13 to 15, from 1 to 5 millimols, per millimol of said primary surfactant, of a nonionic secondary surfactant having an HLB number of from 7 to 9, and at least 10 parts by weight of water.
Claim 7
Dependent Claim
83 words
An oil-in-water emulsion consisting essentially of 100 parts by weight of a water-insoluble oil, at least 0.05 millimol of a nonionic tertiary surfactant having an HLB number of at least 16, at least 3 millimols of a nonionic primary surfactant having an HLB number of from 13 to 15, from 1 to 5 millimols, per millimol of said primary surfactant, of a nonionic secondary surfactant having an HLB number of from 7 to 9, and at least 10 parts by weight of water.
Claim 8
Dependent Claim
24 words
A composition according to claim 5 wherein the water-insoluble oil comprises a polydimethylsiloxane fluid having a viscosity of at least 30 pascal-seconds at 25°C.
Claim 9
Dependent Claim
71 words
A composition according to claim 6 wherein the polydimethylsiloxane fluid consists essentially of (i) 10 to 50 percent by weight, based on the weight of the polydimethylsiloxane fluid, of a nonvolatile polydimethylsiloxane portion having a viscosity at 25°C of at least 10 kilopascal-seconds, and (ii) 50 to 90 percent by weight, on the same basis, of a volatile polydimethylsiloxane portion selected from cyclopolydimethylsiloxanes having 4 and 5 silicon atoms per molecule.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.