| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a laminated glass which maintains basic performance necessary for a laminated glass and little efflorescence in the peripheral part even in a high humidity atmosphere by forming an intermediate film comprising a plasticized polyvinyl acetal resin film having a specified or lower haze when the film is immersed in water. SOLUTION: When the intermediate film for a laminated glass comprising a plasticized polyvinylacetal resin film having 0.3 to 0.8 mm thickness is immersed in water at 23 deg.C, efflorescence of the film after 24 hours is controlled to <=50 % haze. To obtain the haze value above described, sodium salts and potassium salts which cause the efflorescence and which are mixed from the source material are controlled to have <=10μm particle size and to give <=50 ppm sodium concn. and <=100 ppm potassium concn. in the intermediate film. To effectively prevent efflorescence at high humidity, compds. which can form complexes with sodium salts and potassium salts, and org. acids and amines compatible with the resin and the plasticizer are preferably added as dispersants.</p> |
