US3983096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process under pressure in an annular equipment
Assignee: Montedison SpA
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Filing: 1974-10-15
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Granted: 1976-09-28
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Expires: 1994-10-15
Abstract
Abstract An annular reactor for polymerizing and copolymerizing vinyl esters characterized by the fact that the height to width ratio is greater than 1 and preferably greater than 5, that there is a circulating pump in the lower leg of the reactor and that the pump delivery volume of the reactor is between 5 and 30 percent of the reactor total volume, and preferably about 15 percent of the reactor total volume. Methods of polymerizing and copolymerizing vinyl monomers in such a reactor are also disclosed.
Inventors
- 👤 Angelo Segalini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:09
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/1812; B01J19/1837; B01J3/00; B01J3/04; B01J3/042; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
In a process for polymerizing under pressure fluid vinyl monomers which are gradually admixed to an initial reaction medium containing a portion of monomer, wherein the improvement comprises conducting the polymerization in an annular reactor including bottom and top legs joined by two vertical legs and having a height to width ratio greater than 1, a circulating pump in said bottom leg, the vertical leg into which said pump discharges having a volume of between about 5 and 30 percent of the reactor total volume.
Claim 2
Dependent Claim
85 words
In a process for polymerizing under pressure fluid vinyl monomers which are gradually admixed to an initial reaction medium containing a portion of monomer, wherein the improvement comprises conducting the polymerization in an annular reactor including bottom and top legs joined by two vertical legs and having a height to width ratio greater than 1, a circulating pump in said bottom leg, the vertical leg into which said pump discharges having a volume of between about 5 and 30 percent of the reactor total volume.
Claim 3
Dependent Claim
14 words
Polymerization process of claim 1, wherein the monomers are polymerized in an aqueous emulsion.
Claim 4
Dependent Claim
10 words
Polymerization process of claim 1, wherein vinyl acetate is polymerized.
Claim 5
Dependent Claim
18 words
Polymerization process of claim 1, wherein a mixture of vinyl esters and gaseous ethylenically unsaturated monomers is polymerized.
Claim 6
Dependent Claim
24 words
Polymerization process of claim 4, wherein vinyl acetate ethylene copolymers having an ethylene content ranging from 5 to 50 percent by weight as prepared.
Claim 7
Dependent Claim
38 words
Polymerization process of claim 4, wherein vinyl acetate ethylene-vinyl chloride terpolymers having an ethylene content of between 5 and 40 percent by weight and a vinyl chloride content of between 5 and 40 percent by weight are prepared.
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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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |