紫外线吸收剂Lowilite 20 Ultraviolet Light Absorber Lowilite 20 is an ultraviolet light absorber belonging to the benzophenone class of UVAs. 2-Hydroxy-4-methoxybenzophenone (Benzophenone 3) CAS Reg. Number [131-57-7] Typical Properties Appearance Pale yellow crystalline powder Molecular Weight 228 Melting Point, °C 62-65 Gardner Color £8 Specific Gravity (g/cc @ 25°C) 1.339 Thermogravimetric Analysis ( 10 mg @ 10°C/minute under N2) Weight Loss, % 5 10 25 Temperature,°C 220 229 255 Solubility @ 25°C (g/100 ml solvent) Methanol 5 Toluene 50 Ethanol 5 Chlorobenzene 50 Isopropanol 2 Chloroform 120 Acetone 50 Tetrachloroethane 110 O OH OCH3 Ethyl Acetate 60 Methylene Chloride 20 Lowilite 20 is effective in polyesters, polystyrene, polyvinyl chloride, and methacrylate polymers. Specific applications include rigid and plasticized PVC (roofing, hoses), acrylic copolymers (sheet for windows, paneling), and acrylic copolymers, varnishes and adhesives. Lowilite 20 is used in coatings, including clear varnishes, lacquers, linseed oil based alkyds and phenolics, and oil based cosmetics, sunscreen for skin and high protection suntan oils and creams (FDA approved).
