| abstract |
An undercoating composition for a fluorocarbon polymer coating comprising: (a) a modified tetrafluoroethylene polymer in the form of particles of double-layer structure having a core and a shell, the core comprising a tetrafluoroethylene homopolymer or a copolymer of tetrafluoroethylene with a fluorine-containing alpha -olefin, the shell comprising a copolymer of tetrafluoroethylene and said fluorine-containing alpha -olefin copolymerized therewith in a larger amount than in the core, (b) a copolymer of tetrafluoroethylene and said fluorine-containing alpha -olefin, and (c) an auxiliary adhesive agent selected from the group consisting of polyimide, polybismaleimide, polyamideimide and aromatic polyamide. |