US5149856A
Expired / Lapsed
US
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Process for the preparation of carbonic acid diesters containing at least one aromatic ester group
Assignee: Bayer AG
•
Filing: 1991-02-20
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Granted: 1992-09-22
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Expires: 2011-02-20
Abstract
Abstract Aromatic and aliphatic-aromatic carbonic acid diesters can be obtained by transesterification of carbonic acid diesters containing aliphatic ester groups if polymeric hydroxystannoxanes are employed as catalysts.
Inventors
- 👤 Norbert Schon
- 👤 Hans-Josef Buysch
- 👤 Wolfgang Ebert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:47
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
122 words
A process for the preparation of carbonic acid diesters containing at least one aromatic ester group from the reaction of carbonic acid diesters containing at least one aliphatic ester group and phenols by catalysed transesterification, wherein one or more polymeric hydroxystannoxanes containing monomeric units of the formula ##STR14## in which R 1 denotes straight-chain or branched C 1 -C 18 -alkyl, C 3 -C 8 -cycloalkyl, C 6 -C 14 -aryl, C 7 -C 15 -aralkyl or a C 1 -C 18 -alkylene radical or C 6 -C 14 -arylene radical bridging two polyhydroxystannoxane chains, are employed as the catalyst in an amount of 0.001-20% by weight, based on the carbonic acid diester employed which contains at least one aliphatic ester group.
Claim 2
Dependent Claim
122 words
A process for the preparation of carbonic acid diesters containing at least one aromatic ester group from the reaction of carbonic acid diesters containing at least one aliphatic ester group and phenols by catalysed transesterification, wherein one or more polymeric hydroxystannoxanes containing monomeric units of the formula ##STR14## in which R 1 denotes straight-chain or branched C 1 -C 18 -alkyl, C 3 -C 8 -cycloalkyl, C 6 -C 14 -aryl, C 7 -C 15 -aralkyl or a C 1 -C 18 -alkylene radical or C 6 -C 14 -arylene radical bridging two polyhydroxystannoxane chains, are employed as the catalyst in an amount of 0.001-20% by weight, based on the carbonic acid diester employed which contains at least one aliphatic ester group.
Claim 3
Dependent Claim
36 words
The process of claim 1, wherein one or more polymeric hydroxystannoxanes containing monomer units of the formula ##STR15## in which R 2 denotes straight-chain or branched C 3 -C 12 -alkyl, phenyl or benzyl, are employed.
Claim 4
Dependent Claim
33 words
The process of claim 2, wherein one or more polymeric hydroxystannoxanes, containing monomer units of the formula ##STR16## in which R 3 denotes straight-chain on branched C 3 -C 8 -alkyl are employed.
Claim 5
Dependent Claim
17 words
The process of claim 1, wherein the catalyst is employed in an amount of 0.005-5% by weight.
Claim 6
Dependent Claim
17 words
The process of claim 4, wherein the catalyst is employed in an amount of 0.005-2% by weight.
Claim 7
Dependent Claim
65 words
The process of claim 1, wherein a carbonic acid diester containing at least one aliphatic ester group, of the formula R.sup.4 O--CO--OR.sup.5 in which R 4 and R 5 independently of one another denote straight-chain or branched C 1 -C 12 -alkyl or C 3 -C 8 -cycloalkyl, and wherein R 4 can furthermore denote substituted or unsubstituted C 6 -C 12 -aryl, is employed.
Claim 8
Dependent Claim
59 words
The process of claim 6, wherein a carbonic acid diester containing at least one aliphatic ester group, of the formula R.sup.6 O--CO--OR.sup.7 in which R 6 and R 7 independently of one another denote straight-chain or branched C 1 -C 8 -alkyl, cyclopropyl, cyclopentyl or cyclohexyl, and wherein R 6 can furthermore denote substituted or unsubstituted phenyl, is employed.
Claim 9
Dependent Claim
138 words
The process of claim 1, wherein a phenol of the formula ##STR17## in which R 8 denotes hydrogen, C 1 -C 4 -alkyl, C 2 -C 4 -alkenyl, C 1 -C 4 -alkoxy, C 5 -C 6 -cycloalkyl, phenyl, fluorine, chlorine, bromine, cyano or nitro; R 9 represents hydrogen, C 1 -C 4 -alkyl, C 2 -C 4 -alkenyl, C 1 -C 4 -alkoxy, fluorine, chlorine or bromine and represents hydrogen, C 1 -C 4 -alkyl or the group ##STR18## in which X denotes a single bond, --CH 2 --, C 2 -C 5 -alkylene, C 2 -C 5 -alkylidene, C 5 -C 6 -cycloalkylene, C 5 -C 6 -cycloalkylidene, oxygen, sulphur, --CO--, --SO-- or --SO 2 --, or wherein R 9 and R 10 together can also denote a fused-on benzene nucleus, is employed for the transesterification.
Claim 10
Dependent Claim
48 words
The process of claim 8, wherein a phenol of the formula ##STR19## in which R 11 and R 12 independently of one another denote hydrogen, C 1 -C 4 -alkyl , C 5 -C 6 -cycloalkyl or chlorine, and wherein R 11 can additionally denote nitro, is employed.
Claim 11
Dependent Claim
83 words
The process of claim 8, wherein a bisphenol of the formula ##STR20## in which R 13 and R 14 independently of one another denote hydrogen, C 1 -C 4 -alkyl, C 2 -C 4 -alkenyl, C 1 -C 4 -alkoxy, C 5 -C 6 -cycloalkyl, fluorine, chlorine or bromine, and wherein R 13 can additionally denote nitro, and Y represents a single bond, --CH 2 --, C 2 -C 5 -alkylidene, C 5 -C 10 -cycloalkylidene, sulphur or --SO 2 -- is employed.
Claim 12
Dependent Claim
31 words
The process of claim 10, wherein a bisphenol of the formulae ##STR21## in which R 13 , R 14 and Y have the meaning as indicated in claim 10, is employed.
Claim 13
Dependent Claim
15 words
The process of claim 1, which is carried out at a temperature of 50°-300° C.
Claim 14
Dependent Claim
15 words
The process of claim 12, which is carried out at a temperature of 100°-250° C.
Claim 15
Dependent Claim
14 words
The process of claim 1, wherein the polymeric hydroxystannoxane has 3-30 recurring polymeric units.
Claim 16
Dependent Claim
14 words
The process of claim 14, wherein the polymeric hydroxystannoxane has 3-20 recurring polymeric units.
Claim 17
Dependent Claim
15 words
The process of claim 1, which is carried out at a pressure of 0.5-50 bar.
Claim 18
Dependent Claim
15 words
The process of claim 16, which is carried out at a pressure of 1-10 bar.
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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) | 1995-09-22 | 1996-03-23 | 1996-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-22 | 2000-03-23 | 2000-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-22 | 2004-03-23 | 2004-09-22 | $7700.00 | Window Closed / Lapsed |