| 摘要 |
Polyvinylacetal films exhibiting high UV absorbance, freedom from cloudiness, and low tendency for UV stabilizer migration use, as a UV absorber, one or more UV absorbers of the formulae (1a), (1b), (2) or (3) in films formed from plasticizer-containing polyvinyl acetal; |
| 主权项 |
1. A film, containing at least one polyvinyl acetal, at least one plasticiser and 0.01-1.5% by weight of at least one UV absorber selected from the group consisting of compounds of Formulas (1a), (1b), (2) and (3)where R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14=H; halogen, or C1-20 alkyl, C1-20 hydroxyalkyl, C1-20 alkoxyalkyl, or C1-20 acyloxyalkyl groups, in each case optionally substituted by aldehyde, keto or epoxy groups, with the proviso that at least one of the groups R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14 carries a carboxyl, sulfoxy or phosphate group with an alkali metal ion, alkaline earth metal ion, or ammonium ion as a counterion. |
