US4374216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable high solids water-in-oil slurry dispersion composition
Assignee: Stein Hall and Co Inc
•
Filing: 1981-12-09
•
Granted: 1983-02-15
•
Expires: 2001-12-09
Abstract
Abstract This invention provides a non-gelling water-in-oil high solids slurry dispersion of water-soluble polymer. The slurry dispersion composition contains between about 40-80 weight percent of water-soluble polymer, and is prepared by dehydrating a water-in-oil dispersion of synthetic water-soluble polymer, and then slurrying a quantity of finely divided water-soluble polymer into the dehydrated dispersion.
Inventors
- 👤 Laurence G. Dammann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:15
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L5/00; C08L5/14; C08J2300/00; C08J2300/14; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
84 words
A process for the production of a non-gelling water-in-oil high solids slurry dispersion of water-soluble polymer which comprises (1) subjecting a water-in-oil dispersion of synthetic water-soluble polymer to distillation to reduce the water content to less than about 15 weight percent of the dispersion; and (2) slurrying a quantity of finely divided solid water-soluble polymer into the step (1) water-reduced dispersion to provide a slurry dispersion containing between about 40-80 weight percent of water-soluble polymer, based on the weight of the slurry dispersion composition.
Claim 2
Dependent Claim
84 words
A process for the production of a non-gelling water-in-oil high solids slurry dispersion of water-soluble polymer which comprises (1) subjecting a water-in-oil dispersion of synthetic water-soluble polymer to distillation to reduce the water content to less than about 15 weight percent of the dispersion; and (2) slurrying a quantity of finely divided solid water-soluble polymer into the step (1) water-reduced dispersion to provide a slurry dispersion containing between about 40-80 weight percent of water-soluble polymer, based on the weight of the slurry dispersion composition.
Claim 3
Dependent Claim
33 words
A process in accordance with claim 1 wherein the content of water-soluble polymer in the water-reduced dispersion produced in step (1) is in the range between about 20-40 weight percent of the dispersion.
Claim 4
Dependent Claim
23 words
A process in accordance with claim 1 wherein the dispersed water-soluble polymer in step (1) has a particle size below about 10 microns.
Claim 5
Dependent Claim
19 words
A process in accordance with claim 1 wherein the slurry dispersion composition contains a surfactant as an additional component.
Claim 6
Dependent Claim
21 words
A process in accordance with claim 1 wherein the slurry dispersion composition contains finely divided inorganic material as an additional component.
Claim 7
Dependent Claim
17 words
A process in accordance with claim 1 wherein the synthetic water-soluble polymer in step (1) is polyacrylamide.
Claim 8
Dependent Claim
20 words
A process in accordance with claim 1 wherein the solid water-soluble polymer in step (2) is natural or semisynthetic polysaccharide.
Claim 9
Dependent Claim
18 words
A process in accordance with claim 1 wherein the solid water-soluble polymer in step (2) is synthetic polymer.
Claim 10
Dependent Claim
17 words
A process in accordance with claim 1 wherein the solid water-soluble polymer in step (2) is polyacrylamide.
Claim 11
Dependent Claim
18 words
A process in accordance with claim 1 wherein the solid water-soluble polymer in step (2) is polyacrylic acid.
Claim 12
Dependent Claim
19 words
A process in accordance with claim 1 wherein the solid water-soluble polymer in step (2) is poly(acrylamide/acrylic acid) copolymer.
Claim 13
Dependent Claim
18 words
A process in accordance with claim 1 wherein the solid water-soluble polymer in step (2) is polygalactomannan gum.
Claim 14
Dependent Claim
18 words
A process in accordance with claim 1 wherein the solid water-soluble polymer in step (2) is guar gum.
Claim 15
Dependent Claim
17 words
A process in accordance with claim 1 wherein the solid water-soluble polymer in step (2) is hydroxypropylguar.
Claim 16
Dependent Claim
17 words
A process in accordance with claim 1 wherein the solid water-soluble polymer in step (2) is hydroxyethylcellulose.
Claim 17
Dependent Claim
20 words
A process in accordance with claim 1 wherein the oil phase in the slurry dispersion composition is a hydrocarbon medium.
Claim 18
Dependent Claim
13 words
A slurry dispersion composition produced in accordance with the process of claim 1.
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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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |