The present invention relates to a vehicle tyre comprising a piezoelectric device, wherein the piezoelectric device comprises a layer of a piezoelectric polymer having first and second opposing sides, and a first and a second layer of conductive rubber provided adjacent to the first and second opposing sides of the layer of piezoelectric polymer.

According to an embodiment of the present invention, provided is a process for polymerizing molecular weight—adjustable polymer, comprising: a reactant supply step of supplying a gaseous monomer, a surfactant, and an initiator; a polymerization reaction step of performing a polymerization reaction in which the monomer, the surfactant, and the initiator participate; and a product discharging step of discharging the polymer compound produced by the polymerization reaction, wherein the flow rate of the supplied initiator is inversely proportional to the molecular weight of the polymer compound, and the molecular weight of the polymer compound produced by the polymerization reaction is adjusted by controlling the flow rate of the initiator.

According to an embodiment of the present invention, provided is a process for polymerizing molecular weight—adjustable polymer, comprising: a reactant supply step of supplying a gaseous monomer, a surfactant, and an initiator; a polymerization reaction step of performing a polymerization reaction in which the monomer, the surfactant, and the initiator participate; and a product discharging step of discharging the polymer compound produced by the polymerization reaction, wherein the flow rate of the supplied initiator is inversely proportional to the molecular weight of the polymer compound, and the molecular weight of the polymer compound produced by the polymerization reaction is adjusted by controlling the flow rate of the initiator.

This fluorine-containing elastomer composition contains a fluorine-containing elastomer and a filler that has a particle diameter of from 10 nm to 100 nm. The fluorine-containing elastomer is a perfluoro elastomer or a fluorine rubber. The filler is composed of silicon particles, and silicon particles each having an oxide film. This fluorine-containing elastomer composition contains no other substance as a filler.

This fluorine-containing elastomer composition contains a fluorine-containing elastomer and a filler that has a particle diameter of from 10 nm to 100 nm. The fluorine-containing elastomer is a perfluoro elastomer or a fluorine rubber. The filler is composed of silicon particles, and silicon particles each having an oxide film. This fluorine-containing elastomer composition contains no other substance as a filler.

A binder compound, a conductive binder, and a secondary battery containing the same are provided. In some embodiments, the binder compound of the present disclosure has a structure of formula (I), where R.sup.1 and R.sup.2 each independently represent a straight or branched C.sub.1-12 alkyl; R.sup.3 represents a halogen or cyano group; R.sup.4 represents a hydroxymethyl or amino; Z represents a straight or branched C.sub.1-12 alkylene; and m represents an integer selected from 7600-47000. The binder compound and the conductive binder of the present disclosure can improve the storage and cycle performances of the secondary battery.

##STR00001##

A binder compound, a conductive binder, and a secondary battery containing the same are provided. In some embodiments, the binder compound of the present disclosure has a structure of formula (I), where R.sup.1 and R.sup.2 each independently represent a straight or branched C.sub.1-12 alkyl; R.sup.3 represents a halogen or cyano group; R.sup.4 represents a hydroxymethyl or amino; Z represents a straight or branched C.sub.1-12 alkylene; and m represents an integer selected from 7600-47000. The binder compound and the conductive binder of the present disclosure can improve the storage and cycle performances of the secondary battery.

##STR00001##

The invention relates to fluoropolymers that have been modified with low molecular weight, polymeric chain transfer agents, and uses of the modified fluoropolymers. The modified fluoropolymers provide enhanced properties to the fluoropolymer, such as increased adhesion, and hydrophilic characteristics. The modified functional fluoropolymers are useful in many applications, including as binders in electrode-forming compositions and separator compositions, for hydrophilic membranes and hollow fiber membranes, as an aqueous and a solvent cast coating for baked decorative and protective coatings, and as a tie layer between a fluoropolymer layer and an incompatible polymer layer.

The invention relates to fluoropolymers that have been modified with low molecular weight, polymeric chain transfer agents, and uses of the modified fluoropolymers. The modified fluoropolymers provide enhanced properties to the fluoropolymer, such as increased adhesion, and hydrophilic characteristics. The modified functional fluoropolymers are useful in many applications, including as binders in electrode-forming compositions and separator compositions, for hydrophilic membranes and hollow fiber membranes, as an aqueous and a solvent cast coating for baked decorative and protective coatings, and as a tie layer between a fluoropolymer layer and an incompatible polymer layer.

The invention relates to a method of polymerizing at least one monomer comprising a vinylidene fluoride monomer, the method comprising putting in contact the at least one monomer with a polymerization initiator -and an oxidizing agent, the polymerization initiator having the formula (I):

##STR00001##

wherein R.sub.f is a fluoroalkyl group comprising from 1 to 3 carbon atoms; and M.sup.x+ is chosen from a monovalent cation, or a divalent cation, or a trivalent cation, or a tetravalent cation.