| 摘要 |
<p>26775-27 A process for producing aromatic ketone-sulfone copolymers which comprises polymerizing appropriate monomers by a Friedel-Crafts polymerization reaction using a Lewis acid catalyst. A controlling agent such as a Lewis base is added to the reaction medium. The reaction medium comprises, for example, aluminum trichloride as the Lewis acid, an organic Lewis base such as N,N-dimethlformamide or an inorganic Lewis base such as sodium or lithium chloride as the controlling agent, and a diluent such as methylene chloride as the controlling agent, and a diluent such as methylene chloride or 1,2-dichloroethane. The amount of Lewis acid, the amount of Lewis base, the temperature of the reaction and the monomer to diluent molar ratio are varied depending on the monomer system to obtain melt-processable, high molecular weight, substantially linear polymers, for example prepared from copolymerization of p-phenoxybenzoyl chloride and p-phenoxy-benzyenesulfonyl chloride or of terephthaloyl chloride, 1,4benzenedisulfonyl chloride and diphenyl ether, or of like monomers. The copolymers produced by the process of the invention have high temperature stability, mechanical strength, and resistance towards common solvents.</p> |
