The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 28, 1990
Filed:
Aug. 22, 1988
Shuji Ebata, Nigata, JP;
Yasushi Higuchi, Nigata, JP;
Mitsubishi Gas Chemical Company, Ltd., Tokyo, JP;
Abstract
An improved process for producing aromatic polyethers by condensation polymerizing aromatic dihydroxy compounds represented by the general formula: HO--Ar--OH and aromatic dichloro compounds represented by the general formula: Cl--Ar.sup.1 --Y--Ar.sup.2 --Cl, or condensation polymerizing monohydroxymonochloro aromatic compounds represented by the general formula: HO--Ar.sup.1 --Y--Ar.sup.2 --Cl (in the above formulae, Ar, Ar.sup.1, Ar.sup.2 are as defined in the specification) in the presence of alkali metal compounds comprising a combination of alkali metal carbonates comprising carbonate and/or hydrogencarbonate of an alkali metal, e.g., potassium, and alkali metal fluorides. In accordance with the present process, high molecular weight aromatic polyethers can be efficiently produced from aromatic chloro compounds which are inexpensive and easily available.