Patent ID: 8278379

Claim:
An interlayer film for a laminated glass comprising a poly(vinyl acetal) resin (C), which is a blend of a poly(vinyl acetal) resin (A) and a poly(vinyl acetal) resin (B), and a plasticizer, said poly(vinyl acetal) resin (A) having an average polymerization degree of 1,00 to 3,000, said poly(vinyl acetal) resin (B) having an average polymerization degree of 3,000 to 5,000, the difference in the average polymerization degree between said poly(vinyl acetal) resin (A) and poly(vinyl acetal) resin (B) being not less than 1,500, said poly(vinyl acetal) resin (C) having an acetalization degree of 60 to 85 mol % and an acetyl group content of 8 to 30 mol %, with the combined total of said acetalization degree and acetyl group content being not less than 75 mol %, and the cloud point of a solution prepared by dissolving 8 weight parts of said poly(vinyl acetal) resin (C) in 100 weight parts of said plasticizer being not higher than 50° C.