US3896090A
Expired / Lapsed
US
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Process for preparing polycarbonates
Assignee: PPG Industries Inc
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Filing: 1973-09-04
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Granted: 1975-07-22
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Expires: 1993-09-04
Abstract
Abstract Polycarbonates prepared from an alkylene carbonate (or 1,2epoxide with carbon dioxide) and monomeric polyols are prepared in good yield in short reaction times at atmospheric pressure containing high carbon dioxide concentrations, by employing an alkali metal, alkaline earth metal or ammonium borate or hydrocarbyloxy titanate catalyst, such as sodium or potassium borate or titanium acid n-butylate.
Inventors
- 👤 Michael J Maximovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:09
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/30; C08G64/305; C08G64/02; C08G64/0208; C08G64/32; C08G64/34
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
IN THE PROCESS FOR PREPARING POLYCARBONATES BY THE POLYMERIZATION OF ALKYLENE CARBONATE, OR 1,2-EPOXIDE AND CARBON DIOXIDE, WITH FROM ABOUT 0.005 TO ABOUT 0.2 MOLE OF AN ORGANIC COMPOUND HAVING AT LEAST 2 ACTIVE HYDROGENS PER MOLE OF EPOXIDE OR ALKYLENE CARBONATE, THE IMPROVEMENT WHICH COMPRISES CONDUCTING SAID POLYMERIZATION IN THE PRESENCE OF A CATALYTIC AMOUNT OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL, ALKALINE EARTH METAL OR AMMONIUM HYDROCARBYLOXY TITANATE CATALYST, AND SODIUM, POTASSIUM, LITHIUM AND AMMONIUM TETRABORATES AND METABORATES.
Claim 2
Dependent Claim
84 words
IN THE PROCESS FOR PREPARING POLYCARBONATES BY THE POLYMERIZATION OF ALKYLENE CARBONATE, OR 1,2-EPOXIDE AND CARBON DIOXIDE, WITH FROM ABOUT 0.005 TO ABOUT 0.2 MOLE OF AN ORGANIC COMPOUND HAVING AT LEAST 2 ACTIVE HYDROGENS PER MOLE OF EPOXIDE OR ALKYLENE CARBONATE, THE IMPROVEMENT WHICH COMPRISES CONDUCTING SAID POLYMERIZATION IN THE PRESENCE OF A CATALYTIC AMOUNT OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL, ALKALINE EARTH METAL OR AMMONIUM HYDROCARBYLOXY TITANATE CATALYST, AND SODIUM, POTASSIUM, LITHIUM AND AMMONIUM TETRABORATES AND METABORATES.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein the active hydrogen compound is a polyhydric alcohol having the formula HO-R-OH, wherein R is an alkylene radical or divalent polyether group containing from 2 to 25 carbon atoms.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the catalyst is sodium tetraborate.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the catalyst is potassium tetraborate.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the catalyst is sodium, potassium or ammonium metaborate.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the catalyst is potassium acid titanium n-butylate.
Claim 8
Dependent Claim
31 words
The process of claim 1 wherein the catalyst is present in an amount of from 0.01 to about 5 weight percent based on the weight of the alkylene carbonate or 1,2-epoxide.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein the alkylene carbonate is ethylene carbonate and the 1,2-epoxide is ethylene oxide.
Claim 10
Dependent Claim
73 words
In the process for preparing polycarbonates by the polymerization of alkylene carbonate, of 1,2-epoxide and carbon dioxide, with from about 0.005 to aboUt 0.2 mole of a polyol per mole of epoxide or alkylene carbonate, the improvement which comprises conducting said polymerization in the presence of from about 0.01 to about 5 weight percent, based on the weight of the alkylene carbonate or 1,2-epoxide, of sodium, potassium, lithium or ammonium tetraborate or metaborate.
Claim 11
Dependent Claim
73 words
In the process for preparing polycarbonates by the polymerization of alkylene carbonate, of 1,2-epoxide and carbon dioxide, with from about 0.005 to aboUt 0.2 mole of a polyol per mole of epoxide or alkylene carbonate, the improvement which comprises conducting said polymerization in the presence of from about 0.01 to about 5 weight percent, based on the weight of the alkylene carbonate or 1,2-epoxide, of sodium, potassium, lithium or ammonium tetraborate or metaborate.
Claim 12
Dependent Claim
19 words
The process of claim 9 wherein the polyol is a dihydric polyol containing from 2 to 10 carbon atoms.
Claim 13
Dependent Claim
18 words
The process of claim 10 wherein the alkylene carbonate and 1,2-epoxide are ethylene carbonate and ethylene oxide, respectively.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |