| abstract |
A polyvinyl acetal having a degree of acetalization of 50 to 85 mol%, a content of vinyl ester monomer units of 0.1 to 20 mol%, and a viscosity average degree of polymerization of 200 to 5000 is used as a binder for ceramic molding or conductive paste, Peak molecular weight (A) measured by a differential refractive index detector and peak top molecular weight (B) measured by an absorption intensity detector (measured wavelength 280 nm) when the polyvinyl acetal heated for a time is measured by gel permeation chromatography is mathematical A binder satisfying the formula (1) ((AB) / A < 0.60) and having an absorbance at a peak top molecular weight (B) of 0.50 x 10 -3 to 1.00 x 10 -2 . |