US4252939A
Expired / Lapsed
US
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Method for manufacture of aromatic polyester-polycarbonate
Assignee: Mitsubishi Chemical Corp
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Filing: 1979-06-12
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Granted: 1981-02-24
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Expires: 1999-06-12
Abstract
Abstract An aromatic polyester-polycarbonate is prepared by (a) forming a low molecular weight polyester oligomer possessing terminal -OH groups by reacting a solution of a terephthaloyl chloride compound in an organic solvent with a dihydroxy-diaryl compound in an aqueous alkaline solution; (b) reacting said oligomer with phosgene thereby converting said terminal -OH groups to terminal -OCOCl groups; and (c) preparing the desired aromatic polyester-polycarbonate product by polycondensing the product of step (b) with a dihydroxy-diaryl compound in an aqueous alkaline solution.
Inventors
- 👤 Hajime Mori
- 👤 Katsuhisa Kohyama
- 👤 Katsuhiko Nakamura
- 👤 Katsuyuki Sakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:31
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G63/00; C08G63/64; C08G63/68; C08G63/688
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
A method for manufacturing an aromatic polyester-polycarbonate, comprising: (a) forming a low molecular weight polyester oligomer possessing terminal-OH group by reacting a solution of a terephthaloyl chloride compound in an organic solvent with a dihydroxy-diaryl compound in an aqueous alkaline solution over a time period of 5 seconds to 2 minutes, the amount of said terephthaloyl chloride compound ranging from 0.5 to 0.75 moles per mole of said dihydroxy-diaryl compound; (b) reacting said oligomer with phosgene therby converting said terminal-OH groups to terminal-OCOCl groups; and (c) preparing the desired aromatic polyester-polycarbonate product by polycondensing the product of step (b) with a dihydroxy-diaryl compound in an aqueous alkaline solution.
Claim 2
Independent Claim
108 words
A method for manufacturing an aromatic polyester-polycarbonate, comprising: (a) forming a low molecular weight polyester oligomer possessing terminal-OH group by reacting a solution of a terephthaloyl chloride compound in an organic solvent with a dihydroxy-diaryl compound in an aqueous alkaline solution over a time period of 5 seconds to 2 minutes, the amount of said terephthaloyl chloride compound ranging from 0.5 to 0.75 moles per mole of said dihydroxy-diaryl compound; (b) reacting said oligomer with phosgene therby converting said terminal-OH groups to terminal-OCOCl groups; and (c) preparing the desired aromatic polyester-polycarbonate product by polycondensing the product of step (b) with a dihydroxy-diaryl compound in an aqueous alkaline solution.
Claim 3
Dependent Claim
50 words
The method of claim 1, wherein in step (b) the amount of the phosgene is such that the total amount of the phosgene and the terephthaloyl chloride compound ranges from 1 to 3, on a mole ratio basis, relative to the molar amount of the dihydroxy-diaryl compound in step (a).
Claim 4
Dependent Claim
36 words
The method of claim 1, wherein in step (c) the amount of said dihydroxy-diaryl compound reacted with the product of step (b) ranges from 1.1 to 2 equivalents per equivalent of terminal-OCOCl groups in the oligomer.
Claim 5
Dependent Claim
23 words
The method of claim 1, wherein said terephthaloyl compound is 2,4-dichloro-terephthaloyl chloride, 2,5-dibromoterephthaloyl chloride, chloro-terephthaloyl chloride, methylterephthaloyl chloride, 2,5-dimethylterephthaloyl chloride or terephthaloyl chloride.
Claim 6
Dependent Claim
29 words
The method of claim 1, wherein said organic solvent is a chlorinated hydrocarbon or a chlorinated hydrocarbon in admixture with dioxane, tetrahydrofuran, acetophenone, toluene, xylene, cyclohexane, acetone or n-heptane.
Claim 7
Dependent Claim
21 words
The method of claim 1, wherein the mole ratio of said terephthaloyl chloride compound to said dihydroxy-diaryl compound ranges from 1:0.6-0.7.
Claim 8
Dependent Claim
20 words
The method of claim 1, wherein in step (c) said polycondensation is conducted in the presence of an amine catalyst.
Claim 9
Dependent Claim
14 words
The method of claim 7, wherein said amine is trimethylamine, triethylamine, tri-n-propyl-amine and tri-n-butylamine.
Claim 10
Dependent Claim
52 words
The method of claim 1, wherein said aromatic polyester-polycarbonate product is obtained by: (1) washing the reaction mixture of step (c) with water; (2) washing said water washed solution with an aqueous acidic solution; (3) washing said acid washed solution with water; and (4) removing solvent from said second water washed solution.
Claim 11
Dependent Claim
58 words
The method of claim 1, wherein said dihydroxy-diaryl compound has the formula: ##STR3## wherein X is a divalent radical selected from the group consisting of ##STR4## --O--, --S--, --SO-- and --SO 2 --, wherein both R groups are the same or different and are hydrogen, halogen or a monovalent hydrocarbon radical and R' is a divalent hydrocarbon radical.
Claim 12
Dependent Claim
25 words
The method of claim 1, wherein said dihydroxy-diaryl compound is a bis-(hydroxy-aryl)-alkane, a bis-(hyroxyaryl)-cyclo-alkane, a dihydroxy-diaryl ether, dihydroxy-diarylsulfide, a dihydroxy-diaryl sulfoxide or a dihydroxy-diaryl sulfone.
References Cited (Backward Citations)
US3169121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |