US4429083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyesterpolycarbonate
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1982-09-14
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Granted: 1984-01-31
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Expires: 2002-09-14
Abstract
Abstract A process for the production of polyesterpolycarbonate is described, which comprises reacting an aqueous alkaline solution of dihydric phenol and an organic solvent solution of acid chloride to prepare polyester oligomer, mixing chloroformate group-containing polycarbonate oligomer with the polyester oligomer, and polycondensing the polyester oligomer and the polycarbonate oligomer to form the polyesterpolycarbonate.
Inventors
- 👤 Takashi Nakagawa
- 👤 Norio Ogata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:04
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A process for producing polyesterpolycarbonate which comprises reacting an aqueous alkaline solution of dihydric phenol and an organic solvent solution of acid chloride, the molar ratio of the dihydric phenol to the acid chloride being from 1:0.5 to 1:0.75, at a temperature of from 5° to 40° C. for 0.05 to 60 minutes to prepare a polyester oligomer containing terminal hydroxyl group, mixing a chloroformate group-containing polycarbonate oligomer with said polyester oligomer, and polycondensing the polyester oligomer and the polycarbonate oligomer at a temperature of from 0° to 40° C. for 15 to 180 minutes.
Claim 2
Dependent Claim
95 words
A process for producing polyesterpolycarbonate which comprises reacting an aqueous alkaline solution of dihydric phenol and an organic solvent solution of acid chloride, the molar ratio of the dihydric phenol to the acid chloride being from 1:0.5 to 1:0.75, at a temperature of from 5° to 40° C. for 0.05 to 60 minutes to prepare a polyester oligomer containing terminal hydroxyl group, mixing a chloroformate group-containing polycarbonate oligomer with said polyester oligomer, and polycondensing the polyester oligomer and the polycarbonate oligomer at a temperature of from 0° to 40° C. for 15 to 180 minutes.
Claim 3
Dependent Claim
39 words
The process of claim 1, wherein the polyester oligomer and the polycarbonate oligomer are mixed so that the ratio of --OH group to --Cl group in the polycondensation reaction system is within the range of from 0.8:1 to 1.2:1.
Claim 4
Dependent Claim
30 words
The process of claim 1, wherein the polycondensation reaction between the polyester oligomer and the polycarbonate oligomer is performed in the presence of an aqueous alkaline solution of dihydric phenol.
Claim 5
Dependent Claim
26 words
The process of claim 1, wherein the polycarbonate oligomer has a terminal chloroformate group content of at least 75%, with the remaining group being hydroxyl group.
Claim 6
Dependent Claim
84 words
The process of claim 1, wherein the polyester oligomer and the polycarbonate oligomer are mixed so that the ratio of --OH group to --Cl group in the polycondensation reaction system is within the range of from 0.8:1 to 1.2:1; the polycondensation reaction between the polyester oligomer and the polycarbonate oligomer is performed in the presence of an aqueous alkaline solution of dihydric phenol; and the polycarbonate oligomer has a terminal chloroformate group content of at least 75%, with the remaining group being hydroxyl group.
Claim 7
Dependent Claim
99 words
A process for producing polyesterpolycarbonate which comprises reacting an aqueous alkaline solution of dihydric phenol and an organic solvent solution of acid chloride, the molar ratio of the dihydric phenol to the acid chloride being from 0.5:1 to 0.75:1, at a temperature of from 5° to 40° C. for 0.05 to 60 minutes to prepare a polyester oligomer containing terminal --Cl groups, mixing a chloroformate group-containing polycarbonate oligomer and an aqueous alkaline solution of dihydric phenol, and polycondensing the polyester oligomer and the polycarbonate oligomer at a temperature of from 0° to 40° C. for 15 to 180 minutes.
Claim 8
Dependent Claim
99 words
A process for producing polyesterpolycarbonate which comprises reacting an aqueous alkaline solution of dihydric phenol and an organic solvent solution of acid chloride, the molar ratio of the dihydric phenol to the acid chloride being from 0.5:1 to 0.75:1, at a temperature of from 5° to 40° C. for 0.05 to 60 minutes to prepare a polyester oligomer containing terminal --Cl groups, mixing a chloroformate group-containing polycarbonate oligomer and an aqueous alkaline solution of dihydric phenol, and polycondensing the polyester oligomer and the polycarbonate oligomer at a temperature of from 0° to 40° C. for 15 to 180 minutes.
Claim 9
Dependent Claim
39 words
The process of claim 6, wherein the polyester oligomer and the polycarobnate oligomer are mixed so that the ratio of --OH group to --Cl group in the polycondensation reaction system is within the range of from 0.8:1 to 1.2:1.
Claim 10
Dependent Claim
26 words
The process of claim 6, wherein the polycarbonate oligomer has a terminal chloroformate group content of at least 75%, with the remaining group being hydroxyl group.
Claim 11
Dependent Claim
60 words
The process of claim 6, wherein the polyester oligomer and the polycarbonate oligomer are mixed so that the ratio of --OH group to --Cl group in the polycondensation reaction system is within the range of from 0.8:1 to 1.2:1; and the polycarbonate oligomer has a terminal chloroformate group content of at least 75%, with the remaining group being hydroxyl group.
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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) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |