Process for the preparation of low molecular weight anhydride in

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

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526173, 526179, 526180, 526182, 526271, 526208, 526213, 526217, 526218, 526220, 526233, 526234, 526236, 526237, 526272, 526216, C08F 238, C08F22202, C08F22204, C08F22206

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041806379

ABSTRACT:
Low molecular weight polymers of an unsaturated dicarboxylic anhydride monomer (e.g., maleic anhydride) and a copolymerizable monomer (e.g., styrene) are prepared by an improved process which comprises polymerizing the monomers in the presence of the hydroxide or a nucleophilic salt of a monovalent cation (e.g., a nucleophilic salt or the hydroxide of an ammonium compound or of an alkali metal). By the practice of this process, low molecular weight polymers are conveniently and economically obtained without the use of high catalyst concentrations, high temperatures, conventional chain transfer agents, high boiling chain transfer solvents or combinations thereof.

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