| 摘要 |
PROBLEM TO BE SOLVED: To obtain an intermediate film for sandwich glass which does not impair the basic performance necessary for the sandwich glass, such as transparency, weatherability, impact energy absorbability and adhesiveness to glass, has sufficient formability and handling quality and can exhibit excellent sound shielding performance over a wide temperature region. SOLUTION: At least one layer of polyvinyl acetal resin film of the intermediate film for sandwich glass consisting of a laminate composed of the plural plasticized polyvinyl acetal resin films contains the polyvinyl acetal resin (A) of 2,000 to 3,000 in average degree of polymerization and the polyvinyl acetal resin (B) of 300 to 600 in average degree of polymerization and >=1,500 in the difference in the average degree of polymerization from the polyvinyl acetal resin (A). The polyvinyl acetal resin (B) is mixed at a ratio of 3 to 8 pts.wt. per 100 pts.wt. polyvinyl acetal resin (A). |
