| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyvinyl acetal sheet which maintains the transparency and the penetration resistance as a laminated glass and has improved adhesion with polyester film, and an interlayer film for laminated glass and a laminated glass. SOLUTION: The polyvinyl acetal sheet is obtained by forming a polyvinyl acetal containing 0.1 to 5 mass% of a specific acrylamide unit in a sheet form. The polyvinyl acetal is preferably one having an average polymerization degree of 150 to 3,500, and containing 8 to 25 mass% of a vinyl alcohol unit, and 0.1 to 15 mass% of an aliphatic acid vinyl ester unit. COPYRIGHT: (C)2009,JPO&INPIT
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