Patent US4035347A successfully refreshed from Google Patents.
US4035347A
Expired / Lapsed
US
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Method for the preparation of dried latex polymer from aqueous emulsion
Assignee: ChampionX LLC
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Filing: 1976-03-02
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Granted: 1977-07-12
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Expires: 1996-03-02
Abstract
Abstract A method for preparing substantially dry homopolymers and copolymers which comprises forming a polymeric latex or water-in-oil emulsion and partially inverting said latex by regulated contact time with water in the time span 0.5 - 10.0 seconds and preferably less than 1 second. A preferred operation is carried out in a static mixer where the contact time for inversion is regulated by the diameter or length of a cylindrical tube containing static baffles.
Inventors
- 👤 David B. Korzenski
- 👤 Barney Vallino, Jr.
- 👤 Wayne E. Zarnecki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:02
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A method of preparing substantially dry, dust-free, readily soluble homo polymers and copolymers of a water-soluble ethylenic-unsaturated monomer comprising the steps of: A. preparing a water-in-oil emulsion which contains dispersed therein a finely divided water-soluble vinyl addition polymer; B. contacting said emulsion of step (A) with water for about 0.5 - 10 seconds, said water additionally containing dispersed therein from 0.1 to 10.0% by weight based on polymer of a water-soluble surfactant to provide a partially inverted emulsion; C. casting said partially inverted emulsion of step (B) upon a surface to form a thin film; D. heating said film of the partially inverted emulsion to provide a dry film polymer product; and E. recovering said dry film polymer product.
Claim 2
Independent Claim
119 words
A method of preparing substantially dry, dust-free, readily soluble homo polymers and copolymers of a water-soluble ethylenic-unsaturated monomer comprising the steps of: A. preparing a water-in-oil emulsion which contains dispersed therein a finely divided water-soluble vinyl addition polymer; B. contacting said emulsion of step (A) with water for about 0.5 - 10 seconds, said water additionally containing dispersed therein from 0.1 to 10.0% by weight based on polymer of a water-soluble surfactant to provide a partially inverted emulsion; C. casting said partially inverted emulsion of step (B) upon a surface to form a thin film; D. heating said film of the partially inverted emulsion to provide a dry film polymer product; and E. recovering said dry film polymer product.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the polymeric latex is dried by casting said polymeric latex upon a drum dryer.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the drying temperature ranges from 150° to 400° F.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the thickness of the cast film is between 0.001 and 0.25 inches.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein said contact time is less than one second.
Claim 7
Dependent Claim
56 words
The method of claim 1 wherein said water-in-oil emulsion comprises: 1. an aqueous phase ranging between 75 and 95% by weight of the emulsion; 2. a hydrophobic liquid ranging between 4 and 24% by weight of the emulsion; and 3. a water-in-oil emulsifying agent having a concentration between 0.1 and 15% by weight of the emulsion.
Claim 8
Dependent Claim
27 words
The method of claim 1 wherein said water of step (B) contains dispersed therein from 0.1 to 5.0% by weight based on polymer of a water-soluble surfactant.
References Cited (Backward Citations)
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US3826771A
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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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |