US3974126A
Expired / Lapsed
US
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Process and apparatus for continuous production of polycarbonates
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1974-06-25
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Granted: 1976-08-10
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Expires: 1994-06-25
Abstract
Abstract A heat resistant and impact resistant polycarbonate having a narrow distribution of molecular weight is continuously produced by reacting chloroformate ester, prepared in advance by reacting alkaline solution of dioxy compound in a turbulent flow of the two solutions while cooling and subsequently reacting the mixture concurrently in a laminar flow after the viscosity of the mixture has become significant.
Inventors
- 👤 Yoshihiro Narita
- 👤 Hideo Konuma
- 👤 Hiroshi Nishitani
- 👤 Norio Komori
- 👤 Katsuharu Ogishima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:35
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/205; B; B01; B01J; B01J19/00; B01J19/18; B01J19/1862; B01J19/24; B01J19/2415; B01J19/2425; C08G64/22; C08G64/24; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00078
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
77 words
A process for the continuous preparation of polycarbonate resins having an improved molecular weight distribution comprising the steps of: a. reacting a mixture of a chloroformate ester oligomer and a dioxy compound under turbulent flow conditions to form a polycarbonate resin having a viscosity of 10-90% of the final viscosity of said polycarbonate resin; and b. continuing the reaction under laminar flow conditions until said polycarbonate resin has a final viscosity of from 300 to 4,000 cps.
Claim 2
Dependent Claim
77 words
A process for the continuous preparation of polycarbonate resins having an improved molecular weight distribution comprising the steps of: a. reacting a mixture of a chloroformate ester oligomer and a dioxy compound under turbulent flow conditions to form a polycarbonate resin having a viscosity of 10-90% of the final viscosity of said polycarbonate resin; and b. continuing the reaction under laminar flow conditions until said polycarbonate resin has a final viscosity of from 300 to 4,000 cps.
Claim 3
Dependent Claim
36 words
The process of claim 1 wherein said mixture of oligomer and dioxy compound react under said turbulent flow conditions to form a polycarbonate resin having a viscosity 20-60% of the final viscosity of said polycarbonate resin.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein said dioxy compound is an aromatic dioxy compound.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein said oligomer has a molecular weight in the range of 350- 1200.
Claim 6
Dependent Claim
28 words
The process of claim 3 wherein said dioxy compound is present in an amount of 0.1- 1.0 mole per mole of chloroformate group in said chloroformate ester oligomer.
Claim 7
Dependent Claim
30 words
The process of claim 1 wherein said dioxy compound is selected from the group consisting of 4,4'-dioxydiphenyl alkane, halogenated derivatives thereof, 4,4'-dioxydiphenyl alkyl acid, and 4,4'--dioxydiphenyl sulfone and mixtures thereof.
Claim 8
Dependent Claim
15 words
The process of claim 1 wherein a molecular weight modifier is introduced into said mixture.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein said mixture is reacted at a temperature range of from about 20°- 50°C.
Claim 10
Dependent Claim
25 words
The process of claim 1 wherein the heat of the reaction is removed by cooling so as to maintain said reaction at about 20°- 50°C.
Claim 11
Dependent Claim
19 words
The process of claim 1 wherein said chloroformate ester oligomer is formed by reacting said dioxy compound with phosgene.
Claim 12
Dependent Claim
30 words
The process of claim 10 wherein said dioxy compound is selected from the group consisting of 4,4'-dioxydiphenyl alkane, halogenated derivates thereof, 4,4'-dioxydiphenyl alkyl acid, and 4,4'-dioxydiphenyl sulfone, and mixtures thereof.
Claim 13
Dependent Claim
14 words
The process of claim 10 wherein said dioxy compound is in an alkaline solution.
Claim 14
Dependent Claim
24 words
The process of claim 10 wherein sufficient solvent is added such that the concentration of the final polycarbonate resin is 6- 25 weight percent.
References Cited (Backward Citations)
US3674740A
Cited
US3888826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |