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US4803264A
Expired / Lapsed
US
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Process for the preparation of a polysaccharide in oil dispersion and dispersion obtained thereby
Assignee: Shell USA Inc
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Filing: 1986-11-25
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Granted: 1989-02-07
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Expires: 2006-11-25
Abstract
Abstract The invention provides a process for the preparation of a polysaccharide in oil dispersion which comprises the steps of (a) forming a water-in-oil emulsion by dispersing in oil an aqueous solution of polysaccharide, in the presence of at least one dispersion promoter, (b) drying the resulting emulsion azeotropically, and (c) physically isolating from the resulting azeotropically dried residue an oil phase containing oil and dispersion promoter and a polysaccharide in oil dispersion in the form of a suspension phase containing polysaccharide, dispersion promotor and oil; and a polysaccharide in oil dispersion prepared by the process containing 40 to 50% w/w polysaccharide and 3 to 4.5% w/w of at least one dispersion promoter.
Inventors
- 👤 Wilhelmus J. Krijnen
- 👤 Jacob B. Roest
- 👤 Jacob Bloemheuvel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:07
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J2301/00; C08J2301/08; C08J2305/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A process for the preparation of a polysaccharide in oil dispersion which comprises the steps of (a) forming a water-in-oil emulsion by dispersing in oil an aqueous solution of polysaccharide, in the presence of at least one dispersion promoter, (b) drying the resulting emulsion azeotropically, and (c) physically isolating from the resulting azeotropically dried residue an oil phase containing oil and dispersion promotor and a polysaccharide in oil dispersion in the form of a suspension phase containing polysaccharide, dispersion promoter and oil.
Claim 2
Dependent Claim
82 words
A process for the preparation of a polysaccharide in oil dispersion which comprises the steps of (a) forming a water-in-oil emulsion by dispersing in oil an aqueous solution of polysaccharide, in the presence of at least one dispersion promoter, (b) drying the resulting emulsion azeotropically, and (c) physically isolating from the resulting azeotropically dried residue an oil phase containing oil and dispersion promotor and a polysaccharide in oil dispersion in the form of a suspension phase containing polysaccharide, dispersion promoter and oil.
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein the emulsion of step (a) contains 3 to 5% w/w polysaccharide.
Claim 4
Dependent Claim
20 words
A process according to claim 1 or 2 wherein the aqueous solution of polysaccharide contains 7 to 10% w/w polysaccharide.
Claim 5
Dependent Claim
23 words
A process according to any of claims 1 or 2 wherein the at least one dispersion promoter comprises at least one non-ionic emulsifier.
Claim 6
Dependent Claim
27 words
A process according to any of claims 1 or 2 wherein the oil comprises a hydrocarbon solvent distilling within the temperature range 150° C. to 250° C.
Claim 7
Dependent Claim
15 words
A process according to claim 5 wherein the temperature range is 160° to 200° C.
Claim 8
Dependent Claim
38 words
A process according to any of claims 1 or 2 wherein step (b) is effected at a temperature in the range 40° to 60° C. and at a pressure in the range 4×10 3 to 2×10 3 Pa.
Claim 9
Dependent Claim
30 words
A process according to claim 7 wherein the temperature is in the range 40 to 50° C. and the pressure is in the range 4×10 3 to 2.5×10 3 Pa.
Claim 10
Dependent Claim
17 words
A process according to claim 8 wherein the polysaccharide is a xanthan biopolymer or a succinoglycan biopolymer.
References Cited (Backward Citations)
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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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |