US4191705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of carbonic acid esters of polyester-polyols
Assignee: Bayer AG
•
Filing: 1977-10-25
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Granted: 1980-03-04
•
Expires: 1997-10-25
Abstract
Abstract The present invention relates to a process for the preparation of carbonic acid esters of polyester-polyols by transesterifying the polyols with carbonic acid aryl esters at elevated temperatures under vacuum in the presence of a catalyst. The reaction conditions are controlled to avoid the formation of by-products and the chain extension of the polyester-polyols. The present invention is also concerned with the polyester carbonic acid esters so formed, their use in producing polycarbonate block copolymers and the copolymers so produced. The copolymers may be produced by transesterifying the polyester carbonic acid esters with bisphenols and subjecting the bis-hydroxyaryl carbonates so formed to normal polycarbonate synthesis such as interfacial or melt polycondensation.
Inventors
- 👤 Christian Lindner
- 👤 Carlhans Suling
- 👤 Herbert Bartl
- 👤 Manfred Schreckenberg
- 👤 Dieter Freitag
- 👤 Klaus Konig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:28
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64; C08G63/91; C08G63/914; C08G63/916
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
96 words
A process for the preparation of a carbonic acid aryl ester of a polyester-polyol from a polyester-polyol having an average molecular weight (Mn) above about 250 and a carbonic acid bis-aryl ester, comprising heating the polyester-polyol with the carbonic acid bis-aryl ester at a temperature from about 100° C. to 200° C. at a pressure less than about 35 mm Hg in the presence of a catalyst, more than one mol of carbonic acid bis-aryl ester being employed per mol of OH-group, and distilling off the hydroxyaryl compound formed and the excess carbonic acid bis-aryl ester.
Claim 2
Dependent Claim
96 words
A process for the preparation of a carbonic acid aryl ester of a polyester-polyol from a polyester-polyol having an average molecular weight (Mn) above about 250 and a carbonic acid bis-aryl ester, comprising heating the polyester-polyol with the carbonic acid bis-aryl ester at a temperature from about 100° C. to 200° C. at a pressure less than about 35 mm Hg in the presence of a catalyst, more than one mol of carbonic acid bis-aryl ester being employed per mol of OH-group, and distilling off the hydroxyaryl compound formed and the excess carbonic acid bis-aryl ester.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the polyester-polyol has an average molecular weight (Mn) above about 600.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the reaction temperature is from about 100° to 180° C.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the pressure is from about 0.1 mm to 25 mm Hg.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein from about 1.25 to 2.25 mols of carbonic acid bis-aryl ester are employed.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein the polyester-polyol is a polyester-diol.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein the polyester-polyol is a reaction product of polyhydric alcohol with a poly basic carboxylic acid.
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein the polyester-polyol is prepared by polymerizing a lactone.
Claim 10
Dependent Claim
34 words
The process of claim 1 wherein the carbonic acid bis-aryl ester is a compound of the general formula ##STR3## wherein Ar is a substituted or unsubstituted aryl radical having 6 to 18 C atoms.
Claim 11
Dependent Claim
14 words
The process according to claim 1 wherein the catalyst is a basic transesterification catalyst.
Claim 12
Dependent Claim
30 words
The process of claim 1 wherein the amount of catalyst is from about 10 ppm to 300 ppm relative to the total weight of polyester-polyol and carbonic acid bis-aryl ester.
Claim 13
Dependent Claim
21 words
The process of claim 1 wherein the heating is carried out in bulk or in the presence of an inert solvent.
Claim 14
Dependent Claim
38 words
The process of claim 1 wherein the catalyst is sodium phenolate, the polyester-polyol is a polyester-diol, the molar ratio of hydroxy groups to carbonic acid bis-aryl ester is about 1:2, and the reaction temperature is about 150° C.
Claim 15
Dependent Claim
8 words
The product of the process of claim 1.
Claim 16
Dependent Claim
36 words
Compounds of the formula ##STR4## wherein Ar is a substituted or unsubstituted aryl radical having 6 to 18 carbon atoms, "--(polyester)--" is a bivalent radical of a polyester-polyol having a molecular weight (Mn) greater than 250.
Claim 17
Dependent Claim
36 words
Compounds of the formula ##STR4## wherein Ar is a substituted or unsubstituted aryl radical having 6 to 18 carbon atoms, "--(polyester)--" is a bivalent radical of a polyester-polyol having a molecular weight (Mn) greater than 250.
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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) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |