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 ##STR00001##

A cholesteric liquid crystal mixture containing a compound represented by Z.sup.1Y.sup.1-A.sup.1-Y.sup.3-M.sup.1-Y.sup.4-A.sup.2-Y.sup.2Z.sup.2, a compound represented by Z.sup.3Y.sup.5-A.sup.3-Y.sup.7-M.sup.2-P, and a tri- or higher functional polymerizable monomer suppresses deposition of a liquid crystal at the time of forming a film, exhibits a wide characteristic reflection bandwidth of the film. Z.sup.1 to Z.sup.3 represent a polymerizable group; A.sup.1 to A.sup.3 represent an alkylene spacer having a chain of 1 to 30 atoms; M.sup.1 and M.sup.2 represent (-T.sup.1-Y.sup.8).sub.n-T.sup.2-; n indicates a natural number; T.sup.1 and T.sup.2 represent a hydrocarbon or heterocyclic ring; Y.sup.1 to Y.sup.5, Y.sup.7 and Y.sup.8 represent a single bond, O, CO, OCO, COO or OCOO; and P represents a hydrogen atom or an alkyl group.