TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The ultraviolet absorber preferably contains thiophenyl-methylene pyrazolidine dione compound of formula (2).R21 -R24=R11;andR25=R35.    TECHNOLOGY FOCUS - POLYMERS - Preferred Material: The polymeric material is acrylic acid type polymer, polyester type polymer or polycarbonate type polymer, preferably polyacrylic acid, polycarbonate and polyethylene terephthalate, more preferably polyethylene terephthalate. The polymeric material has glass transition temperature of -80 degrees C to 200 degrees C. The polymeric material contains 0.1-50 mass% of ultraviolet absorber with respect to 100 mass% of polyethylene terephthalate, polyacrylic acid or polycarbonate. The polymeric material is obtained by melt-kneading polyethylene terephthalate and ultraviolet absorber at more than 200 degrees C or formed by coating polyacrylic acid or polycarbonate and ultraviolet absorber dissolved in solvent with boiling point of 200 degrees C or less, on a substrate. Preferred Definitions:    R35 =1-30C alkyl, 6-10C aryl, 1-30C alkoxy, 6-30C aryloxy, 2-30C alkoxycarbonyl, 7-11C aryloxycarbonyl, 3-21C carbamoyl, 2-22C acyl (all optionally substituted), halo, hydroxyl, cyano or sulfo.    SPECIFIC COMPOUNDS - The pyrazolidine dione compound is chosen from 58 disclosed compounds such as 1,2-diphenyl-4-(pyridin-2-ylmethylene)pyrazolidine-3,5-dione of formula (A), 1,2-diphenyl-4-(pyridin-4-ylmethylene)pyrazolidine-3,5-dione, 4-(2-furylmethylene)-1,2-dimethylpyrazolidine-3,5-dione, 1,2-dimethyl-4-(1H-pyrrol-2-ylmethylene)pyrazolidine-3,5-dione and 1,2-dimethyl-4-((5-methyl-1H-imidazol-4-yl)methylene)pyrazolidine-3,5-dione.    EXAMPLE - 1,2-Diphenylpyrazolidine-3,5-dione (in g) (1.26), 5-methylthiophene-2-carboaldehyde (0.8), ammonium acetate (0.2) and isopropanol (30 ml) were stirred at 80 degrees C. The precipitated crystals were separated to obtain 4-((5-phenyl-3-methylthien-2-yl)methylene)-1,2-diphenylpyrazolidine-3,5-dione (1.71) with yield of 95%. The obtained compound had long wave ultraviolet absorptivity.