| 摘要 |
PURPOSE:To purify a photopolymer effectively without any loss of its sensitivity, by treating an aqueous solution of the photopolymer comprising a polyalcohol derivative containing a stilbazolium or styrylquinolinium group with an ion exchange resin. CONSTITUTION:An acetalization reaction or an acetal exchange reaction is effected between (modified) polyvinyl alcohol and a compound containing a stilbazolium or styrylquinolinium group, e.g., a compound of formula I or II(wherein R1 and R2 are each H, alkyl or the like, and X<-> is a halogen or the like), to obtain a polyvinyl alcohol derivative photopolymer containing a stilbazolium or styrylquinolium group represented by formula III or IV (wherein Y<-> is a conjugate base of the acid, m is 1-6, and n is 0-1). The reaction mixture is purified by treatment with an ion exchange resin to thereby remove the compounds of formula I , II, etc.
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