LOW DUSTING CRYSTAL TRANSFORMATIONS OF 2, 2'-METHYLENBIS4-(1,1,3,3-TETRAMETHYLBUTYL)-6-BENZOTRIAZOLYLPHENOL AND MIXTURE THEREOF, METHOD FOR PREPARING THEM, AND ULTRAVIOLET ABSORBENT USING THE SAME

摘要

A low dusting crystalline 2, 2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-benzotriazolylphenol] I type crystal transformation which exhibits diffraction peaks at diffraction angles (2θ ± 0.1°) of 7.1°, 8.6°, 14.3°, 16.1°, 18.1° and 23.0° in the powder X-ray diffraction analysis with the Cu-Kα line, a low dusting amorphous 2, 2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-benzotriazolylphenol] II type crystal transformation which exhibits not a clear peak but a halo in the powder X-ray diffraction analysis with the Cu-Kα line, and a mixture thereof; methods for preparing them; and an ultraviolet absorvent, an emulsion composition and a polymer material which use one of them.