US4130527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating a polymer latex to remove unreacted monomer by treatment in a column
Assignee: Stauffer Chemical Co
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Filing: 1977-12-29
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Granted: 1978-12-19
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Expires: 1997-12-29
Abstract
Abstract Residual unreacted monomer, such as vinyl chloride monomer, is removed from an aqueous latex of polymer, such as polyvinyl chloride, by allowing the latex to flow as a thin liquid film down the inner surface of a substantially vertical column at subatmospheric pressure countercurrent to an ascending flow of steam. If desired, packing may be inserted in the column to enhance the removal of residual monomer.
Inventors
- 👤 Robert S. Miller
- 👤 Francis J. Doyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:34
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/001; C08F6/003; B; B01; B01D; B01D1/00; B01D1/06; B01D1/12; C08C; C08C1/00; C08C1/02; C08C1/04; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
A process for removal of unreacted, residual monomer from an aqueous latex of polymer which comprises introducing the latex without any substantial mechanical shear stress being imparted thereto to a substantially vertical column so that it flows down the interior surface of said column in a thin film countercurrent to a flow of steam while being maintained at subatmospheric pressure.
Claim 2
Dependent Claim
60 words
A process for removal of unreacted, residual monomer from an aqueous latex of polymer which comprises introducing the latex without any substantial mechanical shear stress being imparted thereto to a substantially vertical column so that it flows down the interior surface of said column in a thin film countercurrent to a flow of steam while being maintained at subatmospheric pressure.
Claim 3
Dependent Claim
33 words
A process as claimed in claim 1 wherein the polymer is selected from the group consisting of polyvinyl chloride, butadiene rubber, styrene-butadiene rubber, butadiene-acrylonitrile rubber, polyvinyl acetate, ethylene-vinyl acetate copolymer, polystyrene, and polychloroprene.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 1 wherein the polymer is a vinyl chloride polymer.
Claim 5
Dependent Claim
22 words
A process as claimed in claim 1 wherein the steam is at a temperature of about 60° C. to about 99° C.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 1 wherein the thickness of the film varies from about 0.1 mm. to about 1.0 mm.
Claim 7
Dependent Claim
22 words
A process as claimed in claim 1 wherein the column has a diameter of from about 25 mm. to about 1800 mm.
Claim 8
Dependent Claim
21 words
A process as claimed in claim 1 wherein the column has a length of from about 0.9 to about 18 m.
Claim 9
Dependent Claim
30 words
A process as claimed in claim 1 wherein the latex is introduced at a flow rate of from about 0.02 to about 0.60 gm/min. per square centimeter of surface area.
Claim 10
Dependent Claim
21 words
A process as claimed in claim 1 wherein the subatmospheric pressure is from about 150 to about 749 mm. of mercury.
Claim 11
Dependent Claim
23 words
A process as claimed in claim 1 wherein the flow rate of the steam ranges from about 2 kg./hr. to about 60 kg./hr.
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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) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |