US3962202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing olefinic monomers which substantially eliminates polymer buildup
Assignee: Geon Co
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Filing: 1973-08-27
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Granted: 1976-06-08
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Expires: 1993-08-27
Abstract
Abstract There is disclosed a process for polymerizing olefinic monomers, such as vinyl halides, vinylidene halides and vinylidene monomers having at least one terminal CH 2 =C< grouping, and mixtures thereof whereby polymer build-up on the inner surfaces of the reactor is substantially eliminated. The process is carried out in a reaction vessel the inner surfaces of which are coated with a coating composition containing, as a primary ingredient, polyethyleneimine and wherein the polymerization medium in contact with said coated surfaces contains a water-soluble divalent tin salt as a water-phase polymerization inhibitor. The coating and inhibitor produce a synergistic effect.
Inventors
- 👤 Marion G. Morningstar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:24
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/002; C08F2/004; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
In a process for the polymerization of monomers selected from vinyl halides, vinylidene halides, vinylidene monomers having at least one terminal CH 2 =C< grouping, and mixtures thereof which comprises polymerizing the monomer or monomers in an aqueous polymerization medium which contains a water-soluble divalent tin salt of an inorganic acid as a water-phase polymerization inhibitor and keeping said polymerization medium in constant contact with a surface coated with a composition comprised predominantly of an insolubilized polyethyleneimine polymer throughout the polymerization reaction, whereby due to the synergistic effect of said polyethyleneimine and said inhibitor, polymer build-up on said surface is substantially eliminated.
Claim 2
Dependent Claim
102 words
In a process for the polymerization of monomers selected from vinyl halides, vinylidene halides, vinylidene monomers having at least one terminal CH 2 =C< grouping, and mixtures thereof which comprises polymerizing the monomer or monomers in an aqueous polymerization medium which contains a water-soluble divalent tin salt of an inorganic acid as a water-phase polymerization inhibitor and keeping said polymerization medium in constant contact with a surface coated with a composition comprised predominantly of an insolubilized polyethyleneimine polymer throughout the polymerization reaction, whereby due to the synergistic effect of said polyethyleneimine and said inhibitor, polymer build-up on said surface is substantially eliminated.
Claim 3
Dependent Claim
13 words
A process as defined in claim 1 wherein the monomer is vinyl chloride.
Claim 4
Dependent Claim
23 words
A process as defined in claim 1 wherein the polymerization reaction is conducted at a temperature in the range of 0°C. to 100°C.
Claim 5
Dependent Claim
16 words
A process as defined in claim 1 wherein the composition contains formaldehyde as an insolubilizing agent.
Claim 6
Dependent Claim
15 words
A process as defined in claim 1 wherein said water-phase polymerization inhibitor is stannous chloride.
Claim 7
Dependent Claim
13 words
A process as defined in claim 5 wherein the monomer is vinyl chloride.
Claim 8
Dependent Claim
23 words
A process as defined in claim 6 wherein the polymerization reaction is conducted at a temperature in the range of 0°C. to 100°C.
Claim 9
Dependent Claim
16 words
A process as defined in claim 7 wherein the composition contains formaldehyde as an insolubilizing agent.
References Cited (Backward Citations)
US3757001A
Cited
US3778423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |