Provided is an aromatic polymer phosphonic acid derivative in which a phosphonic acid derivative group is directly bound to aromatic ring. Said aromatic polymer phosphonic acid derivative can be produced by brominating a specific aromatic polymer compound ...

A porous thermoplastic resin film capable of functioning well as a separator of a cell is provided. The porous film is constituted with a thermoplastic resin and a filler, wherein X R defined by the following formula: X R = 25 × T GUR × d 2 /Y is smaller...

A separator for a non-aqueous electrolyte secondary battery, wherein the separator comprises a shut-down layer, a heat-resistant microporous layer, and a spacer having the form of particles, fibers, net or porous film on the surface of the heat-resistant m...

Provided is a polymer electrolyte containing a block copolymer comprising one or more blocks having sulfonic acid groups and one or more blocks having substantially no sulfonic acid group, and at least one block among all blocks is a block having aromatic ...

Aluminium hydroxide having specific characteristics, and a tyre tread rubber composition and a pneumatic tyre employing the aluminium hydroxide, which allow grip performance and abrasion resistance to increase and rolling resistance to decrease and are sup...

Provided is an active material for non-aqueous secondary battery having improved safety with maintaining the capacity and the cycle characteristic, a process for producing the same, and a non-aqueous secondary battery using the same. The active material ca...