| 摘要 |
<p>PURPOSE:A drumhead having excellent mechanical strength and low-temperature properties, prepared by molding into a sheet a resin obtained by copolymerizing at least two specified fluorine-containing monomers. CONSTITUTION:70-98wt% of a fluroine-containing monomer selected from the group consisting of vinyl fluoride, vinylidene fluoride, chlorotrifluoroethylene, tetrafluoroethylene, hexafluoropropylene and hexafluorobutylene is copolymerized with 80-2wt% of at least one different member selected from said group. Sheets obtained by T-die extrusion of the resulting fluorine-containing resin are employed as drumheads. The crystallinity of the fluorine-containing resin can be lowered by adding thereto a small amount (for example, below 20wt%) of polymethyl methacrylate or a methyl methacrylate copolymer.</p> |
