Continuous, solvent-free process for making copolymers of maleic anhydride and C1-4 alkyl vinyl ether
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United States of America Patent
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Sep 17, 2002
Grant Date -
Dec 20, 2001
app pub date -
May 18, 2001
filing date -
Jun 15, 2000
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Abstract
A continuous, solvent-free process for obtaining solvent-free, fine white powders of high molecular weight alternating copolymers of maleic anhydride and a C.sub.1 -C.sub.4 alkyl vinyl ether, without odor or taste, having the molecular structure (A--B).sub.n, where A is maleic anhydride, B is an alkyl vinyl ether and n is an integer indicative of the molecular weight of the copolymer, which comprises feeding alkyl vinyl ether as reactant and solvent in excess over the desired 1:1 mole ratio of A:B in the copolymer, molten maleic anhydride and a free radical initiator, continuously at predetermined feeding rates into a reactor heated at a reaction temperature of about 50.degree. to 100.degree. C., charging the reactor and withdrawing reaction product, residual alkyl vinyl ether and initiator from the reactor at the same rate as the feed rate of reactants into the reactor simultaneously thereby maintaining a constant volume in the reactor, stripping residual alkyl vinyl ether from the reaction product, drying the copolymer obtained of any remaining traces of alkyl vinyl ether, and recycling recovered alkyl vinyl ether back into reactor as reactant and solvent.
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