US3968090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing heat of polymerization
Assignee: Mitsubishi Chemical Corp
•
Filing: 1974-12-23
•
Granted: 1976-07-06
•
Expires: 1994-12-23
Abstract
Abstract A method and an apparatus for removing the heat of polymerization evolved during a polymerization procedure carried out while the liquid polymerization mixture is stirred in a reactor are provided. A condensable vapor present in the space above the liquid level of the polymerization mixture inside the reactor is condensed by a cooling means provided in said space while the inner pressure of the reactor is maintained at a level such that the polymerization mixture does not boil. Preferably, the vapor phase is stirred.
Inventors
- 👤 Kazushi Shimada
- 👤 Toru Maeda
- 👤 Yasuhiko Iwaoka
- 👤 Hisao Anzai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:18
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0006; B01J19/0013; B01F; B01F27/00; B01F27/80; B01F27/86; B01J19/18; B01F2215/00; B01F2215/04; B01F2215/0413; B01F2215/0418; B01F2215/0427; B01F2215/0431; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00083; B01J2219/00087; B01J2219/00094; B01J2219/18; B01J2219/185
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
A method for removing the heat of polymerization evolved during bulk polymerization of methyl methacrylate or a mixture of a predominant amount of methyl methacrylate and a minor amount of at least one other copolymerizable monomer in which method the liquid polymerization mixture is stirred while polymerization is performed, comprising the step of: condensing a condensable vapor present in the space above the liquid level of the polymerization mixture inside the polymerization reactor by a cooling means provided in said space while the vapor phase above the liquid level is stirred and the inner pressure of the polymerization reactor is maintained at such a level that the polymerization mixture does not boil.
Claim 2
Independent Claim
112 words
A method for removing the heat of polymerization evolved during bulk polymerization of methyl methacrylate or a mixture of a predominant amount of methyl methacrylate and a minor amount of at least one other copolymerizable monomer in which method the liquid polymerization mixture is stirred while polymerization is performed, comprising the step of: condensing a condensable vapor present in the space above the liquid level of the polymerization mixture inside the polymerization reactor by a cooling means provided in said space while the vapor phase above the liquid level is stirred and the inner pressure of the polymerization reactor is maintained at such a level that the polymerization mixture does not boil.
Claim 3
Dependent Claim
15 words
A method as recited in claim 1, wherein methyl methacrylate is the sole polymerizable monomer.
Claim 4
Dependent Claim
28 words
A method as recited in claim 1, wherein the other copolymerizable monomer is a member selected from the group consisting of methyl acrylate, ethyl acrylate and butyl acrylate.
References Cited (Backward Citations)
US3439065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |