| 摘要 |
The invention relates to a plasticizer-containing polyvinyl acetal film which has a transmission of less than 20% and a yellowness index db of less than 3 at 400 nm, containing at least one UV absorber of formula where R1 is H or halogen and R2 and R3 are C1-20 alkyl-, hydroxyalkyl-, alkoxyalkyl-, acyloxyalkyl groups, optionally substituted by aldehyde, keto or epoxide groups, and an antioxidant of formula where R is hydrocarbon residue of a polyfunctional alcohol, an oligoglycol with 1 to 10 glycol units, or a hydrocarbon group with 1 to 20 carbon atoms, and s=1, 2, 3 or 4. |
