Bisphenol A-epichlorohydrin-piperazine copolymer DER 331-piperazine copolymer Epikote 828-piperazine copolymer JER 828-piperazine copolymer Oxirane, (chloromethyl)-, polymer with 4,4′-(1-methylethylidene)bis[phenol] and piperazine Phenol, 4,4′-(1-methylethylidene)bis-, polymer with (chloromethyl)oxirane and piperazine Phenol, 4,4′-(1-methylethylidene)bis-, polymer with 2-(chloromethyl)oxirane and piperazine Phenol, 4,4′-isopropylidenedi-, polymer with 1-chloro-2,3-epoxypropane and piperazine Piperazine-YD 128 copolymer Piperazine, polymer with (chloromethyl)oxirane and 4,4′-(1-methylethylidene)bis[phenol]