C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/320, 402/33
C08G 75/20 (2006.01) C08G 61/12 (2006.01) C08G 65/40 (2006.01) C08G 67/00 (2006.01) C08G 75/23 (2006.01)
Patent
CA 1103391
ABSTRACT A process for the manufacture of an aromatic polyketone or polysulphone which comprises polymerizing one or more monomers, which monomer(s) are homo- or co- polymerizable by a Friedel-Crafts acylation reaction, in the presence of a Friedel-Crafts catalyst and of a solvent, the solvent being present in an amount at least sufficient to dissolve the monomer(s) present at the start of polymer- ization and, after polymerization, treating the resulting reaction mixture containing polymer-catalyst complex with a base having a pKa of at least about 4.5 (measured in water) in an amount at least equimolar to the catalyst but insufficient to cause precipitation of the polymer, the base being at least partially soluble in the solvent, being stable in the reaction mixture and not forming a stable adduct with the polymer, thereby to decompose the polymer- catalyst complex and form a base-catalyst complex. The process affords polymers that are substantially free of catalyst residues and that are melt-stable.
258689
Fetherstonhaugh & Co.
Raychem Corporation
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