EP0435124A2
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Processes for preparing aromatic polycarbonates
Assignee: SABIC Innovative Plastics Japan KK
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Filing: 1990-12-17
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Granted: —
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Expires: 2010-12-17
Abstract
Abstract According to the present invention, there is provided an improvement which comprises adding an acid compound and if necessary an epoxy compound to a reaction product resulting from melt polycondensation reaction of an aromatic dihydroxy compound with a carbonic acid diester in the presence of an alkaline compound catalyst.
Inventors
- 👤 Takeshi Sakashita
- 👤 Tomoaki Shimoda
- 👤 Hideyuki Itoi
- 👤 Takashi Nagai
- 👤 Kotarou Kishimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 00:30
CPC Classifications
C; C08; C08G; C08G63/00; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1515; C08G64/00; C08G64/20; C08G64/30; C08G64/307; C08K3/00; C08K3/32; C08K5/36; C08K5/41; C08K5/42
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
47 words
In a process for preparing an aromatic polycarbonate by melt polycondensation of an aromatic dihydroxy compound with a carbonic acid diester in the presence of an alkaline compound catalyst, the improvement which comprises adding an acid compound to a reaction product resulting from the melt polycondensation reaction.
Claim 2
Dependent Claim
52 words
In a process for preparing an aromatic polycarbonate by melt polycondensation of an aromatic dihydroxy compound with a carbonic acid diester in the presence of an alkaline compound catalyst, the improvement which comprises adding an acid compound and an epoxy compound to a reaction product resulting from the melt polycon- densation reaction.
Claim 3
Dependent Claim
52 words
In a process for preparing an aromatic polycarbonate by melt polycondensation of an aromatic dihydroxy compound with a carbonic acid diester in the presence of an alkaline compound catalyst, the improvement which comprises adding an acid compound to a reaction product resulting from the melt polycondensation reaction, followed by pressure reducing treatment.
Claim 4
Dependent Claim
60 words
In a process for preparing an aromatic polycarbonate by melt polycondensation of an aromatic dihydroxy compound with a carbonic acid diester in the presence of at least one kind of alkaline compound catalyst, the improvement which comprises adding an acid compound and an epoxy compound to a reaction product resulting from the melt polycondensation reaction, followed by pressure reducing treatment.
Claim 5
Dependent Claim
50 words
The process for preparing an aromatic polycarbonate as claimed in any of claims 1-4 wherein the alkaline compound catalyst contains (a) an alkali metal compound and/or an alkaline earth metal compound in an amount of not more than 10 -4 mole based on one mole of the aromatic dihydroxy compound.
Claim 6
Dependent Claim
57 words
The process for preparing an aromatic polycarbonate as claimed in any of claims 1-4 wherein the alkaline compound catalyst contains (a) an alkali metal compound and/or an alkaline earth metal compound in an amount of not more than 10 -4 mole based on one mole of the aromatic dihydroxy compound, and (b) a nitrogen containing basic compound.
Claim 7
Dependent Claim
58 words
The process for preparing an aromatic polycarbonate as claimed in any of claims 1-4 wherein the alkaline compound catalyst contains (a) an alkali metal compound and/or an alkaline earth metal compound in an amount of not more than 10 -4 mole based on one mole of the aromatic dihydroxy compound, and (b) boric acid or boric acid ester.
Claim 8
Dependent Claim
64 words
The process for preparing an aromatic polycarbonate as claimed in any of claims 1-4 wherein the alkaline compound catalyst contains (a) an alkali metal compound and/or an alkaline earth metal compound in an amount of not more than 10 -4 mole based on one mole of the aromatic dihydroxy compound, (b) a nitrogen containing basic compound, and (c) boric acid or boric acid ester.
Claim 9
Dependent Claim
48 words
The process for preparing an aromatic polycarbonate as claimed in any of claims 1-4 wherein the alkali metal compound and/or the alkaline earth metal compound is used in an amount of 10 -7 - 3 X 10 -6 mole based on one mole of the aromatic dihydroxy compound.
Claim 10
Dependent Claim
48 words
The process for preparing an aromatic polycarbonate as claimed in any of claims 1-4 wherein the alkali metal compound and/or the alkaline earth metal compound is used in an amount of 10 -7 - 2 X 10 -6 mole based on one mole of the aromatic dihydroxy compound.
Claim 11
Dependent Claim
42 words
The process for preparing an aromatic polycarbonate as claimed in any of claims 1-4 wherein the acid compound is Bronsted acid, Lewis acid or ester of acid containing a sulfur atom of which acid residue having pKa of not more than 3.
Claim 12
Dependent Claim
44 words
The process for preparing an aromatic polycarbonate as claimed in any of claims 1-4 wherein the acid compound is used in an amount of 0.1-50 moles based on one mole of the sum of the alkali metal compound and/or the alkaline earth metal compound.
Claim 13
Dependent Claim
64 words
The process for preparing an aromatic polycarbonate as claimed in claim 10 wherein the Lewis acid is used in an amount of 0.1-30 moles based on one mole of the sum of the alkali metal compound and/or the alkaline earth metal compound, and the Bronsted acid or the ester of acid containing a sulfur atom is used similarly in an amount of 0.1-7 moles.
Claim 14
Dependent Claim
27 words
The process for preparing an aromatic polycarbonate as claimed in claims 1-4 wherein pKa of the acid compound in water at 25°C is not more than 3.
Claim 15
Dependent Claim
23 words
The process for preparing an aromatic polycarbonate as claimed in claims 1-4 wherein the acid compound contains a sulfur atom or phosphorus atom.
Claim 16
Dependent Claim
63 words
An aromatic polycarbonate composition comprises (i) an aromatic polycarbonate obtained by allowing an aromatic dihydroxy compound and a carbonic acid diester to under melt polycondensation in the presence of an alkaline catalyst, and (ii) acid compound, wherein an amount of the acid compound is 0.1-50 moles based on one mole of the sum of the alkali metal compound and/or alkaline earth metal compound.
Claim 17
Dependent Claim
37 words
The aromatic polycarbonate composition as claimed in claim 16 wherein the amount of the acid compound is 0.1-7 moles based on one mole of the sum of the alkali metal compound and/or the alkaline earth metal compound.
Claim 18
Dependent Claim
91 words
An aromatic polycarbonate composition comprises (i) an aromatic polycarbonate obtained by allowing an aromatic dihydroxy compound and a carbonic acid diester to undergo melt polycondensation in the presence of an alkaline catalyst, (ii) an acid compound, and (iii) an epoxy compound wherein an amount of the acid compound is 0.1-50 moles based on one mole of the sum of the alkali metal compound and/or the alkaline earth metal compound and, an amount of the epoxy compound is 0.001-0.1 part by weight based on 100 parts by weight of the aromatic polycarbonate.
Claim 19
Dependent Claim
21 words
The aromatic polycarbonate composition wherein the acid compound is Bronsted acid, Lewis acid or ester of acid containing a sulfur atom.
Claim 20
Dependent Claim
30 words
The aromatic polycarbonate composition wherein pKa of at least one kind of an acid residue of the ester of strong acid containing a sulfur atom is not more than 3.
References Cited (Backward Citations)
No citation records indexed.
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