1,4-Diacetyldiphenyl oxide-acetophenone copolymer 4,4′-Diacetyldiphenyl ether-acetophenone polymer 4,4′-Diacetyldiphenyl oxide-acetophenone polymer Acefen 1 Acetophenone-4,4′-diacetyldiphenyl ether copolymer Acetophenone-4,4′-diacetyldiphenyl oxide copolymer Acetophenone-4,4′-diacetyldiphenyl oxide polymer Acetophenone-4,4′-oxydiacetophenone copolymer Ethanone, 1-phenyl-, polymer with 1,1′-(oxydi-4,1-phenylene)bis[ethanone] Ethanone, 1,1′-(oxydi-4,1-phenylene)bis-, polymer with 1-phenylethanone