| 摘要 |
<P>PROBLEM TO BE SOLVED: To produce a multilayer sheet, for example for laminated glass, having improved mechanical properties and having high plasticizer compatibility by selecting polyvinyl acetal to be used. <P>SOLUTION: This sheet laminate is formed of at least three layers A, B and C each containing at least one plasticizer and at least one polyvinyl acetal. At least one of the layers A, B, C contains, as polyvinyl acetal, at least one polyvinyl (iso)acetal having a mean degree of polymerization of less than 3,000, 10-25 mass% of polyvinyl alcohol group content and 50-80 mass% of polyvinyl (iso)acetal group content, and the layer B has a plasticizer content of less than 32 mass%. <P>COPYRIGHT: (C)2013,JPO&INPIT |
