US4448953A
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US
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Preparation of benzoate ester terminated polycarbonate with aroyl halide
Assignee: General Electric Co
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Filing: 1982-08-18
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Granted: 1984-05-15
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Expires: 2002-08-18
Abstract
Abstract A process for preparing an aromatic polycarbonate of controlled molecular weight which comprises interfacially reacting in water and an organic solvent, a dihydric phenol, a carbonate precursor and a molecular weight controlling effective amount of a compound of the formula ##STR1## wherein n is an integer having a value of from 0 to 5 inclusive; Y is a halide or hydroxyl; and each R is independently selected from the group consisting of alkyl radicals, aryl radicals, alkaryl radicals, aralkyl radicals, alkoxy radicals, aryloxy radicals, halides, ##STR2## radicals wherein R 2 is selected from hydrogen, alkyl radicals or acyl radicals or R 3 is an acyl radical or --C.tbd.N. The polymers are useful in injection molded articles.
Inventors
- 👤 Niles R. Rosenquist
- 👤 Victor Mark
- 👤 Charles V. Hedges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:25
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A process for preparing an aromatic polycarbonate resin of controlled molecular weight which comprises interfacially reacting in water and an organic solvent, a dihydric phenol, a carbonate precursor and a molecular weight controlling effective amount of a compound of the formula ##STR24## wherein n is an integer having a value of from 0 to 5 inclusive; Y is a halide or hydroxyl; and each R is independently selected from the group consisting of alkyl radicals, aryl radicals, alkaryl radicals, aralkyl radicals, alkoxy radicals, aryloxy radicals, halides, ##STR25## radicals wherein R 2 is selected from hydrogen, alkyl radicals or acyl radicals or R 3 is an acyl radical or --C.tbd.N.
Claim 2
Dependent Claim
109 words
A process for preparing an aromatic polycarbonate resin of controlled molecular weight which comprises interfacially reacting in water and an organic solvent, a dihydric phenol, a carbonate precursor and a molecular weight controlling effective amount of a compound of the formula ##STR24## wherein n is an integer having a value of from 0 to 5 inclusive; Y is a halide or hydroxyl; and each R is independently selected from the group consisting of alkyl radicals, aryl radicals, alkaryl radicals, aralkyl radicals, alkoxy radicals, aryloxy radicals, halides, ##STR25## radicals wherein R 2 is selected from hydrogen, alkyl radicals or acyl radicals or R 3 is an acyl radical or --C.tbd.N.
Claim 3
Dependent Claim
29 words
A process in accordance with claim 1 wherein the amount of said compound is from about 1 to 7 mole percent based on the moles of dihydric phenol present.
Claim 4
Dependent Claim
15 words
The process in accordance with claim 2 wherein the organic solvent is a chlorinated hydrocarbon.
Claim 5
Dependent Claim
13 words
The process in accordance with claim 3 wherein the carbonate precursor is phosgene.
Claim 6
Dependent Claim
13 words
The process in accordance with claim 4 wherein the dihydric phenol is 2,2-bis(4-hydroxyphenyl)propane.
Claim 7
Dependent Claim
14 words
The process in accordance with claim 5 wherein the chlorinated hydrocarbon is methylene chloride.
Claim 8
Dependent Claim
11 words
The process in accordance with claim 6 wherein Y is chloro.
Claim 9
Dependent Claim
13 words
The process in accordance with claim 7 wherein R is independently an alkyl.
Claim 10
Dependent Claim
16 words
The process in accordance with claim 8 wherein R is tertiary butyl and n is one.
Claim 11
Dependent Claim
11 words
The process in accordance with claim 6 wherein n is one.
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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |