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US4031056A
Expired / Lapsed
US
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Process for the removal of vinyl chloride from latexes containing polyvinyl chloride
Assignee: Occidental Chemical Corp
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Filing: 1976-02-02
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Granted: 1977-06-21
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Expires: 1996-02-02
Abstract
Abstract Vinyl chloride is removed from latex that contain polyvinyl chloride by subjecting a fine spray of minute droplets of the latex to vacuum until the monomer content of the latex has been substantially reduced.
Inventors
- 👤 Piyush J. Patel
- 👤 William Miringoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:30
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/14; C08F6/16; B; B01; B01D; B01D19/00; B01D19/0042; B01D19/0047; C08F6/001; C08F6/003
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
158 words
The process for the removal of vinyl chloride from an aqueous latex that contains from about 1000 parts to 50,000 parts by weight of vinyl chloride per million parts by weight of latex and from 5% to 50% by weight of a polymer selected from the group consisting of polyvinyl chloride and copolymers of vinyl chloride with at least one monomer copolymerizable therewith, said polymer being present in the latex as particles ranging in size from 0.01 micron to 2 microns, that comprises the steps of a. maintaining the latex at a temperature in the range of 20° C. to 70° C., b. passing a stream of the latex through a rapidly-rotating perforated disc to form a fine spray of minute droplets of the latex, c. passing said spray into an evacuated chamber that is maintained at a pressure below about 400 torr, and d. recovering from said evacuated chamber an aqueous latex of reduced vinyl chloride content.
Claim 2
Dependent Claim
158 words
The process for the removal of vinyl chloride from an aqueous latex that contains from about 1000 parts to 50,000 parts by weight of vinyl chloride per million parts by weight of latex and from 5% to 50% by weight of a polymer selected from the group consisting of polyvinyl chloride and copolymers of vinyl chloride with at least one monomer copolymerizable therewith, said polymer being present in the latex as particles ranging in size from 0.01 micron to 2 microns, that comprises the steps of a. maintaining the latex at a temperature in the range of 20° C. to 70° C., b. passing a stream of the latex through a rapidly-rotating perforated disc to form a fine spray of minute droplets of the latex, c. passing said spray into an evacuated chamber that is maintained at a pressure below about 400 torr, and d. recovering from said evacuated chamber an aqueous latex of reduced vinyl chloride content.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein in Step (a) the latex is maintained at a temperature in the range of 40° C. to 60° C.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein in Step (c) the evacuated chamber is maintained at a pressure below 200 torr.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein in Step (c) the evacuated chamber is maintained at a pressure below 100 torr.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein the perforated disc through which the latex is passed has holes ranging in size from 0.1 mm. to 3 mm.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein the perforated disc through which the latex is passed has holes ranging in size from 0.5 mm. to 1.5 mm.
Claim 8
Dependent Claim
36 words
The process of claim 1 wherein the stream of latex is passed through a colloid mill before it is passed through the rapidly-rotating perforated disc to form a fine spray of minute droplets of the latex.
Claim 9
Dependent Claim
41 words
The process of claim 1 wherein the aqueous latex recovered in Step (d) is recycled to Step (a) and Steps (b), (c), and (d) are repeated until the vinyl chloride content of the aqueous latex has reached the desired low level.
Claim 10
Dependent Claim
102 words
The process of claim 1 that comprises the steps of a. maintaining the latex at a temperature in the range of 40° C. to 60° C., b. passing a stream of the latex through a colloid mill, c. passing the stream of latex through a rapidly-rotating perforated disc having holes ranging in size from 0.5 mm. to 1.5 mm. to form a fine spray of minute droplets of the latex. d. passing said spray into an evacuated chamber that is maintained at a pressure below 200 torr, and e. recovering from said evacuated chamber an aqueous latex of reduced vinyl chloride content.
Claim 11
Dependent Claim
17 words
The process of claim 9 wherein the evacuated chamber is maintained at a pressure below 100 torr.
Claim 12
Dependent Claim
22 words
The process of claim 9 wherein the perforated disc through which the latex is passed has holes about 0.5 mm. in diameter.
Claim 13
Dependent Claim
43 words
The process of claim 9 wherein the aqueous latex that is recovered in Step (e) is recycled to Step (a) and Steps (b), (c), (d), and (e) are repeated until the vinyl chloride content of the aqueous latex has reached the desired level.
Claim 14
Dependent Claim
18 words
The process of claim 1 wherein the aqueous latex contains 15% to 30% by weight of polyvinyl chloride.
References Cited (Backward Citations)
US3371059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |