Composition of cyclic anhydride modified polyvinyl acetal and curable resin and laminated products

Abstract

Disclosed are a modified polyvinyl acetal resin consisting essentially of repeating units represented by the following formula (I), and a modifier for curable resins which comprises the modified polyvinyl acetal resin: wherein R1 represents an optionally substituted aryl group, an optionally substituted aralkyl group, or an optionally substituted alkenyl group having an optionally substituted aryl group; R2 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms; R3 represents an optionally substituted, bivalent hydrocarbon group having 1 to 20 carbon atoms; and a, b, c, d, and e indicate the proportions in mol % of the respective structural units in the formula and satisfy 0<a≦85, 0≦b≦80, 0≦c≦50, 0≦d≦30, and 0<e≦50; a curable resin composition comprising a curable resin (A), a curing agent (B), and a modified polyvinyl acetal resin (C) consisting essentially of repeating units represented by (I′); and a laminated product comprising a layer of the curable resin composition and/or a cured composition obtained therefrom and a substrate layer: wherein R1, R2, and R3 are as defined above and a, b, c, d, and e, indicating the proportions in mol % of the respective structural units in the formula, satisfy 0≦a≦85, 0≦≦80, 0≦c≦50, 0≦d≦30, 0<e≦50, and a+b≠0.

Dependencies are inferred from the claim text.