EP0035897A2
Expired / Lapsed
EP
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Process for preparation of linear aromatic polyester by transesterification polymerization
Assignee: Celanese Corp
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Filing: 1981-03-06
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Granted: —
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Expires: 2001-03-06
Abstract
Abstract Linear aromatic polyesters of bisphenols and dicarboxylic compounds are prepared by transesterification polymerixation of monomer reactants comprising a bisphenol and a diaryl ester of a dicarboxylic acid in the presence of a basic catalyst, wherein basic catalyst, preferably normally solid at 30°C, is introduced into the reaction zone either in liquid form, for example by introducing a normally solid material in molten form or in solution in a solvent, or substantially concurrently with the liquid state reactants. The process avoides substantial heating of reactants in contact with catalyst before onset of the transesterification reaction and provides products of unexpectedly low polydispersity.
Inventors
- 👤 Jerold C. Rosenfeld
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 07:40
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/78
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
A process for preparing a linear aromatic polyester by transesterification polymerization of monomer reactants comprising a bisphenol and a diaryl ester of a dicarboxylic acid in the presence of a basic catalyst for said polymerization wherein said reactants are introduced into a polymerization reaction zone in the liquid state, characterised by introducing a basic catalyst that is normally solid at 30°C. into the polymerization reaction zone in liquid form.
Claim 2
Dependent Claim
69 words
A process for preparing a linear aromatic polyester by transesterification polymerization of monomer reactants comprising a bisphenol and a diaryl ester of a dicarboxylic acid in the presence of a basic catalyst for said polymerization wherein said reactants are introduced into a polymerization reaction zone in the liquid state, characterised by introducing a basic catalyst that is normally solid at 30°C. into the polymerization reaction zone in liquid form.
Claim 3
Dependent Claim
66 words
A process for preparing a linear aromatic polyester by transesterification polymerization of monomer reactants comprising a bisphenol and a diaryl ester of a dicarboxylic acid in the presence of a basic catalyst for said polymerization wherein said reactants are introduced into a polymerization reaction zone in the liquid state, characterised by introducing the catalyst and the liquid state reactants substantially concurrently into the polymerization reaction zone
Claim 4
Dependent Claim
66 words
A process for preparing a linear aromatic polyester by transesterification polymerization of monomer reactants comprising a bisphenol and a diaryl ester of a dicarboxylic acid in the presence of a basic catalyst for said polymerization wherein said reactants are introduced into a polymerization reaction zone in the liquid state, characterised by introducing the catalyst and the liquid state reactants substantially concurrently into the polymerization reaction zone
Claim 5
Dependent Claim
19 words
A process according to claim 2 herein at least one reactant is melted prior to mixing with the catalyst.
Claim 6
Dependent Claim
15 words
A process according to claim 1, 2 or 3 wherein the bisphenol is bisphenol A.
Claim 7
Dependent Claim
24 words
A process according to any one of claims 1 to 4 wherein the diaryl ester is diphenyl isophthalate, diphenyl terephthalate or a mixture thereof.
Claim 8
Dependent Claim
22 words
A process according to any one of the preceding claims wherein the catalyst, normally solid at 30°C, is introduced in molten form.
Claim 9
Dependent Claim
28 words
A process according to any one of claims 1 to 5, wherein the catalyst, normally solid at 30°C, is introduced in solution in a solvent for the catalyst.
Claim 10
Dependent Claim
19 words
A process according to claim 7 wherein the catalyst is a metal phenoxide introduced as a solution in phenol.
Claim 11
Dependent Claim
26 words
A process according to claim 8 wherein the metal phenoxide is an alkali metal phenoxide selected from rubidium phenoxide, potassium phenoxide, lithium phenoxide and sodium phenoxide.
Claim 12
Dependent Claim
18 words
A process according to claim 7 wherein the catalyst comprises a reaction product of potassium borohydride and phenol.
References Cited (Backward Citations)
No citation records indexed.
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