Back to results
US 4,287,321 AGranted
Poly(phenylene ether)poly(vinyl aromatic) compositions
AssigneeGeneral Electric Company
InventorWalter K. Olander
Life of this patent
Estimating the term…
Abstract
Polyphenylene ether-poly(vinyl aromatic) compositions are prepared by oxidatively coupling a phenol dissolved in a basic reaction medium comprising a vinyl aromatic compound in the presence of a manganese chelate catalyst, selectively liquid-liquid extracting base-reactive by-products, then thermally polymerizing the vinyl aromatic compound.
Claims12
A process for the preparation of a composition comprising a polyphenylene ether and a poly(vinyl aromatic) compound, said process comprising the steps of:
- (a) oxidatively coupling a phenolic monomer to form a polyphenylene ether in a basic reaction medium comprising a polymerizable vinyl aromatic compound in the presence of a manganese chelate complex of the formula
- (L).sub.x Mn
- wherein L is a ligand derived from an .omega.-hydroxyoxime by conventional means, Mn is the transition metal manganese and x is at least equal to about 0.05;
- (b) selectively liquid-liquid extracting from the reaction mixture of step (a) with an immiscible solvent to the base-reactive by-products therein;
- and
- (c) thereafter heating the base-extracted solution of polyphenylene ether in vinyl aromatic compound under polymerization conditions until at least part of said vinyl aromatic compound has been polymerized.
3 more elements
Dependencies are inferred from the claim text.