Diethyl Ether → Lytron 810

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In 200 ml of methyl ethyl ketone were dissolved 18.14 g of maleic anhydride and 21.86 g of α-methylstyrene, and to the solution was added 1.82 g of azobisisobutylnitrile (AIBN). The resulting mixture was heated at 60° C. for 7 hours under nitrogen atmosphere for performing polymerization. The reaction solution was then dropwise added to 500 ml of ethyl ether under stirring to precipitate a polymer. Thus precipitated polymer was collected by filtration and purified by repeating twice the THF dissolution-ethyl ether precipitation procedure described in Example 1. Thus purified polymer was dried under vacuum at 100° C. for 24 hours to give 17.0 g of a maleic anhydride-styrene copolymer. It was confiremed by elementary analysis that the copolymerization ratio was approximately 1:1. Mn was 11,730.

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