| abstract |
A film comprising polyvinyl acetal which has a degree of acetalization of 50 to 85 mol%, a vinyl ester monomer unit of 0.1 to 20 mol%, and a viscosity-average polymerization degree of 1400 to 5000, wherein the film satisfies formulae (1) and (2). (A-B)/A<0.80 (1) 1.00×10 -2 <(b/y)/(a/x)<2.00×10 -1 (2) Accordingly, a film which has lower coloring due to heat and less foreign matters (undissolved fractions) is provided. Also provided is a laminated glass in which the film is used as an interlayer and which has excellent penetration resistance. |