The present invention pertains to composition suitable for manufacturing membranes based on vinylidene fluoride (VDF) polymers, to porous membranes thereof, to methods for their manufacture and to uses thereof, especially for the filtration of water phases. Said composition comprising vinylidene fluoride (VDF) polymers and polymer additives comprising zwitterionic moieties delivers outstanding hydrophilization performances of manufactured membranes.

The present invention pertains to composition suitable for manufacturing membranes based on vinylidene fluoride (VDF) polymers, to porous membranes thereof, to methods for their manufacture and to uses thereof, especially for the filtration of water phases. Said composition comprising vinylidene fluoride (VDF) polymers and polymer additives comprising zwitterionic moieties delivers outstanding hydrophilization performances of manufactured membranes.

An object is to provide a fluorine-containing polymer film. The object can be achieved by a fluorine-containing polymer film having a thermal shrinkage of 0.4% or less after being heated at 90° C. for 1 hour, and having a relative permittivity of 3 to 50 at 25° C. at 1000 Hz, or a fluorine-containing polymer film having a crystallinity of 50% or more and an elongation at break of 400% or more.

An object is to provide a fluorine-containing polymer film. The object can be achieved by a fluorine-containing polymer film having a thermal shrinkage of 0.4% or less after being heated at 90° C. for 1 hour, and having a relative permittivity of 3 to 50 at 25° C. at 1000 Hz, or a fluorine-containing polymer film having a crystallinity of 50% or more and an elongation at break of 400% or more.

Provided are a composite that can be suitably used as an electrolyte for polymer-based solid-state batteries and is excellent in oxidation resistance and flame retardancy, and various electrochemical devices using such a composite. The composite contains a fluorine-containing copolymer that comprises a tetrafluoroethylene (TFE) unit and a vinylidene fluoride (VdF) unit, and an alkali metal salt, wherein the total content of the TFE unit and the VdF unit in the fluorine-containing copolymer is 1 to 99 mol %, and the composite has a volatile content of 0.1 mass % or less with respect to the entire composite.

Provided are a composite that can be suitably used as an electrolyte for polymer-based solid-state batteries and is excellent in oxidation resistance and flame retardancy, and various electrochemical devices using such a composite. The composite contains a fluorine-containing copolymer that comprises a tetrafluoroethylene (TFE) unit and a vinylidene fluoride (VdF) unit, and an alkali metal salt, wherein the total content of the TFE unit and the VdF unit in the fluorine-containing copolymer is 1 to 99 mol %, and the composite has a volatile content of 0.1 mass % or less with respect to the entire composite.

Provided are a composite that can be suitably used as an electrolyte for polymer-based solid-state batteries and is excellent in oxidation resistance and flame retardancy, and various electrochemical devices using such a composite. The composite contains a fluorine-containing copolymer that comprises a tetrafluoroethylene (TFE) unit and a vinylidene fluoride (VdF) unit, and an alkali metal salt, wherein the total content of the TFE unit and the VdF unit in the fluorine-containing copolymer is 1 to 99 mol %, and the composite has a volatile content of 0.1 mass % or less with respect to the entire composite.

The invention provides novel latexes of particles of vinylidene fluoride/trifluoroethylene copolymers possessing a more ordered ferroelectric crystalline phase, and hence improved ferro-, pyro-, and piezo-electric properties, and a method for manufacturing the same by emulsion polymerization in the presence of certain cyclic fluorosurfactants.

The invention provides novel latexes of particles of vinylidene fluoride/trifluoroethylene copolymers possessing a more ordered ferroelectric crystalline phase, and hence improved ferro-, pyro-, and piezo-electric properties, and a method for manufacturing the same by emulsion polymerization in the presence of certain cyclic fluorosurfactants.

An object of the present invention is to improve the piezoelectricity of a PVT having the VDF ratio of 82 to 90% represented by a copolymer, in which copolymerization of vinylidene fluoride VDF and trifluoroethylene TrFe is 85 versus 15 (this is written as PVT85/15, and which is excellent in resistance to deformation, and heat resistance, etc. And therefore, it is also to obtain a piezoelectric film having piezoelectricity exceeding a PVT of less than 82 mol % of VDF represented by a PVT75/25, which conventionally shows the highest piezoelectricity, and a method of producing the same. A piezoelectric film is made of a mixture of two kinds (for example, a first copolymer is PVT85/15 and a second copolymer is PVT75/25) having different polymerization ratios of vinylidene fluoride VDF and trifluoroethylene TrFE.