FIELD: industrial organic synthesis. SUBSTANCE: water-insoluble polyvinylacetals and -ketals are continuously prepared by reaction of polyvinyl alcohol with aldehyde or ketone in presence of catalyst containing acid functions chemically attached to flat- surface support insoluble in reaction milieu. This support is polymer film, cation-exchange membrane, or surface of inorganic material selected from zeolites, bentonites, or glass. EFFECT: enabled continuity of process and avoided formation of acidic waste. 7 cl, 2 dwg, 3 ex
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