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US 4,734,485 AGranted
Method of manufacturing polyphenylene ethers
AssigneeHuls Aktiengesellschaft
InventorsMartin Bartmann, Wilfried Ribbing
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Abstract
The invention relates to the method of manufacturing polyphenylene ethers by an oxidative coupling reaction of monomeric phenols in a solvent mixture comprised of an aromatic hydrocarbon with 6-8 carbon atoms and an aliphatic alcohol with 1-4 carbon atoms in a volumetric ratio of the hydrocarbon to the alcohol of 92.5:7.5 to 50:50, in the presence of a catalyst comprised of cupric chloride, a secondary diamine, and morpholine.
Claims8
A method for preparing a polyphenylene ether, comprising:
- oxidatively coupling a phenol of the formula ##STR2## wherein R.sub.3 and R.sub.4 are H or CH.sub.3 ;
- and R.sub.1 and R.sub.2 are either n- or iso-alkyl groups with 1-6 carbon atoms or R.sub.1 is hydrogen and R.sub.2 is a tertiary alkyl group with 4-6 carbon atoms,
- with oxygen or oxygen-containing gas mixtures, in an organic solvent in the presence of a copper-amine catalyst comprising:
- (a) anhydrous or hydrated CuCl or CuCl.sub.2 ;
- (b) a secondary diamine of the formula
- R.sub.b --NH--R.sub.a --NH--R.sub.c
- wherein R.sub.a is a C.sub.2 -C.sub.4 alkylene group, and R.sub.b and R.sub.c are C.sub.1 -C.sub.10 secondary or tertiary alkyl groups;
- and
- (c) morpholine;
- and wherein
- said organic solvent is a mixture of a C.sub.6 -C.sub.8 aromatic hydrocarbon and a C.sub.1 -C.sub.4 aliphatic alcohol in a volumetric ratio in the range of 92.5:7.5 to 50:50.
8 more elements
Dependencies are inferred from the claim text.