US3676485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for use in a continuous flow reaction for producing a monomer and or a protopolymer
Assignee: Eastman Kodak Co
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Filing: 1968-08-12
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Granted: 1972-07-11
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Expires: 1988-08-12
Abstract
Abstract Method by which an esterification precursor is continuously converted to an esterification reaction product liquid by admixing a feed stream of the precursor into and with a circulating stream of the product liquid, heating the admixture to vaporize a low-boiling component, the heating being at a sufficient temperature and for a sufficient time to convert the precursor to the product liquid, maintaining circulation of the admixture by separating the low-boiling component therefrom, thereby establishing a flow of liquid from a more dense zone to a less dense zone in the circulating liquid stream, and continuously withdrawing a stream of the product liquid from the circulating admixture. The method further includes converting the precursor to a protopolymeric liquid having substantially uniformly suspended therein particulate solid matter.
Inventors
- 👤 Alan E Lewis
- 👤 Frederick W Voight Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:34
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/785; B; B01; B01D; B01D1/00; B01D1/06; B01D1/12; B01J; B01J19/00; B01J19/0006; B01J19/0013; B01J19/24; B01J19/2455; B01J19/2465; C07; C07C; C07C67/00; C07C67/03; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00087; B01J2219/00101
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
28 words
A method as defined in claim 1, and wherein said precursor material is a relatively low viscosity liquid and said product liquid is a relatively higher viscosity liquid.
Claim 2
Dependent Claim
34 words
A method as defined in claim 1, wherein said precursor material comprises dimethyl terephthalate and glycol, said product liquid comprises monomer of said dimethyl terephthalate and said glycol and said low-boiling component is methanol.
Claim 3
Dependent Claim
35 words
A method as defined in claim 1, and wherein said precursor material is a liquid monomer of poly(ethylene terephthalate), said product liquid comprises a protopolymer of poly(ethylene terephthalate) and said low-boiling component is ethylene glycol.
Claim 4
Dependent Claim
38 words
A method as defined in claim 1, and wherein said precursor liquid has a viscosity of less than 5 centipoises at a temperature of from about 215* to 220* C. prior to admixture with said circulating liquid stream.
Claim 5
Dependent Claim
23 words
A method as defined in claim 1, and wherein said product liquid has a viscosity of from about 100 to about 200 centipoises.
Claim 6
Dependent Claim
37 words
A method as defined in claim 1, and wherein the precursor material is admixed with the circulating liquid stream at a volume ratio of one part precursor material to about 10 to 500 parts circulating liquid stream.
Claim 7
Independent Claim
147 words
A method of continuously converting a precursor material comprising monomer derived from dimethyl terephthalate and glycol to a protopolymeric liquid having substantially uniformly suspended therein particulate solid matter, said method comprising: mixing said particulate solid matter and said precursor material; admixing a feed stream of said mixture with a circulating liquid stream comprising said protopolymeric liquid; heating said admixture to vaporize glycol, whereby said admixture is maintained at a velocity sufficient to keep said particulate solid matter in suspension, said heating being at a sufficient temperature and for a sufficient time to convert said precursor material to said product liquid containing substantially uniformly dispersed particulate solid matter; maintaining circulation of said admixture by separating said vaporized glycol therefrom, thereby establishing a flow of liquid from a more dense zone to a less dense zone in the circulating liquid stream; and withdrawing protopolymeric liquid from said circulating admixture.
Claim 8
Dependent Claim
43 words
A metHod as defined in claim 8, and wherein said precursor material is a relatively low viscosity liquid monomer of poly(ethylene terephthalate), said product liquid is a relatively higher viscosity liquid protopolymer of poly(ethylene terephthalate) and said predetermined low-boiling component is ethylene glycol.
Claim 9
Dependent Claim
36 words
A method as defined in claim 8, and wherein the precursor material is admixed with the circulating liquid stream at a volume ratio of one part precursor material to 10 to 500 parts circulating liquid stream.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |