high purity and stable and safe,competitive price 2,2'-azobis(2-methylpropionamide) dihydrochloride,AIBA,water soluble azo initiator, 98%,free of ... styrene and butyl acrylatePoly acrylic acidpoly acrylnitrileemulsion polymeriationkraft polymerization 2,2'-Azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride,VA-044,water soluble azo initiator, 98%