Ethene, tetrafluoro-, polymer with 1,1-difluoroethene TETRAFLUORETHENE POLYMER WITH 1,1-DIFLUOROETHENE) 1,1-Difluoroethylene-tetrafluroethylene copolymer tetrafluoroethylene/ 1,1-difluoroethylene copolymer Poly(1,1-difluoroethene-co-tetrafluoroethene) Poly(tetrafluoroethylene-co-vinylidene fluoride) Poly(vinylidene fluoride-co-perfluoroethylene) Poly(-vinylidene fluoride-co-tetrafluoroethylene)