Method for the production of phosphorus-containing aromatic polyester
AssigneeKorea Kumho Petrochemical Co., Ltd.
InventorsYoung H. Ko, Seung D. Cho, Byung C. Jeon
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Abstract
A phosphorus-containing wholly aromatic polyester is produced by an interfacial polymerization method which includes the step of reacting a phosphorus-containing bisphenol compound and a bisphenol compound with dicarboxylic acid chlorides. An organic layer containing the dicarboxylic acid chlorides and phase transfer catalyst is added into an alkaline aqueous layer which contains a bisphenol compound.
Claims4
An interfacial polymerization method for forming a phosphorus-containing wholly aromatic polyester having a repeated unit of the following general formula (I) ##STR6## wherein m and n are integers, both being in the relation of 0.ltoreq.n/(m+n)<1 and 0<m/(m+n).ltoreq.1, R being selected from the group consisting of an alkyl group containing 1 to 2 carbon atoms and an aryl group containing 6 to 12 carbon atoms, X being selected from the group consisting of an alkylene group containing 1 to 4 carbon atoms and an alkylidene group containing 1 to 4 carbon atoms, and R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.1 ', R.sub.2 ', R.sub.3 ', R.sub.4 ' which are independent and each comprises a hydrogen atom and an alkyl group containing 1 to 2 carbon atoms, the method comprising the steps of:
- providing an aqueous phase containing demineralized water and an alkali salt selected from the group consisting of a bisphenol and a phosphorus-containing bisphenol;
- providing an organic phase containing an organic solvent, a phthaloyl chloride, and a catalytic amount of a phase-transfer catalyst;
- and
- adding said organic phase to said aqueous phase.
Dependencies are inferred from the claim text.