Patent EP0484035A1 successfully refreshed from Google Patents.
Patent US6103786A successfully refreshed from Google Patents.
US6103786A
Expired / Lapsed
US
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Process for preparing stable, finely divided polymer dispersions
Assignee: Polymer Latex GmbH and Co KG
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Filing: 1998-02-24
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Granted: 2000-08-15
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Expires: 2018-02-24
Abstract
Abstract Stable polymer dispersions with polymer particle sizes of 0.1 to 10 μm are prepared by dissolving a water-in-oil emulsion, comprising a polymer dissolved in an organic solvent which is immiscible with water (organic phase) and an aqueous phase, wherein the viscosity of the organic phase is 1.0 to 20,000 mPas (measured at 25° C.), the surface tension between organic and aqueous phase is 0.01 to 30 mN/m, the particle size of the water emulsified in the organic phase is 0.2 to 50 μm and the ratio by volume of organic phase to aqueous phase is in the range 80:20 to 20:80, subjecting this emulsion to a shear process at a shear power of 1×10 3 to 1×10 8 Watts per cm 3 , wherein the water-in-oil emulsion is converted into an oil-in-water emulsion.
Inventors
- 👤 Martin Hoch
- 👤 Rainer Elbert
- 👤 Bernd Klinksiek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:40
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/07; Y; Y10; Y10S; Y10S516/00; Y10S516/924; Y10S516/925; Y10S526/00; Y10S526/932
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
A process for preparing stable polymer dispersions with polymer particle sizes of 0.1 to 10 μm d 50 determined in an ultracentrifuge, wherein a water-in-oil emulsion, comprising a polymer dissolved in an organic solvent which is immiscible with water (organic phase) and an aqueous phase, wherein the viscosity of the organic phase is 1.0 to 20,000 mPas (measured at 25° C.), the surface tension between organic and aqueous phase is 0.01 to 30 mN/m, the particle size of the water emulsified in the organic phase is 0.2 to 50 μm and the ratio by volume of organic phase to aqueous phase is in the range 80:20 to 20:80, is subjected to a shear process at a shear power of 1×10 3 to 1×10 8 Watts per cm 3 , wherein the water-in-oil emulsion is converted into an oil-in-water emulsion.
Claim 2
Dependent Claim
139 words
A process for preparing stable polymer dispersions with polymer particle sizes of 0.1 to 10 μm d 50 determined in an ultracentrifuge, wherein a water-in-oil emulsion, comprising a polymer dissolved in an organic solvent which is immiscible with water (organic phase) and an aqueous phase, wherein the viscosity of the organic phase is 1.0 to 20,000 mPas (measured at 25° C.), the surface tension between organic and aqueous phase is 0.01 to 30 mN/m, the particle size of the water emulsified in the organic phase is 0.2 to 50 μm and the ratio by volume of organic phase to aqueous phase is in the range 80:20 to 20:80, is subjected to a shear process at a shear power of 1×10 3 to 1×10 8 Watts per cm 3 , wherein the water-in-oil emulsion is converted into an oil-in-water emulsion.
Claim 3
Dependent Claim
81 words
Process according to claim 1, wherein the viscosity of the organic phase is 10 to 20,000 mPas, the surface tension between the organic and aqueous phase is 0.5 to 30 mN/m, the particle size of the water emulsified in the organic phase is 1 to 25 μm and the ratio by volume of organic phase to aqueous phase is in the range 70:30 to 30:70 and the shear power is in the range 1×10 6 to 1×10 7 Watts/cm 3 .
Claim 4
Dependent Claim
25 words
Process according to claim 1, wherein an emulsifier selected from the group consisting of sodium dodecylbenzene sulfonate, potassium oleate and a mixture thereof is present.
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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) | 2003-08-15 | 2004-02-14 | 2004-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-08-15 | 2008-02-14 | 2008-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-08-15 | 2012-02-14 | 2012-08-15 | $7700.00 | Window Closed / Lapsed |