Sun Chemical Corporation has acquired a 50 percent interest in Assemblage Intermoleculaire en Chimie Organique (AIC), a special effect pigments, additives and inks company based in Libourne, France.       AIC manufactures high-performance additives that function as pigments in the security and specialty inks markets.      Dr. David Hill, Sun Chemical’s chief technology officer, said, “AIC has a strong technology position and is poised to become the leading player in thermochromic and photo...