Abstract: Provided is a fluorinated ether compound capable of imparting excellent antifouling properties such as oil-based ink repellency, fingerprint stain removability, to a hard coating layer; a composition for forming a hard coating layer, and an article having an antifouling hard coating layer formed from the composition. The fluorinated ether compound has either a poly(oxyperfluoroalkylene) chain having a repeated unit that includes a C1-2 oxyperfluoroalkylene group and a C3-6 oxyperfluoroalkylene group, bonded to each other, or a poly(oxyperfluoroalkylene) chain having a repeated unit that contains a C4 oxyperfluoroalkylene group and a different oxyperfluoroalkylene group, bonded to each other, a linking group bonded to a first terminal of the poly(oxyperfluoroalkylene) chain, and at least one (meth)acryloyl group bonded to the linking group.

Abstract: To provide a process for producing a charge retention medium, with which a coating film (precursor of a charge retention medium) containing a fluorinated copolymer having repeating units based on tetrafluoroethylene and repeating units based on ethylene can easily be formed on the surface of a substrate, even in a case where the surface of the substrate has a complicated shape. A process for producing a charge retention medium (electret 30), which comprises a step of applying a coating composition containing a fluorinated copolymer (A) having repeating units based on tetrafluoroethylene and repeating units based on ethylene, and an organic solvent (C), to a substrate (first substrate 10) to form a coating film.

Abstract: To provide a fluorinated ether compound capable of imparting excellent antifouling properties (oil-based ink repellency, fingerprint stain removability) to a hard coating layer, etc., a composition for forming a hard coating layer, containing such a compound, and an article having an antifouling hard coating layer formed from such a composition.

Abstract: To provide a charge retention medium having a surface potential at a practical level, although it is obtained from a composition containing a fluorinated copolymer having repeating units based on tetrafluoroethylene and repeating units based on ethylene. A charge retention medium (electret 30) which is obtained from a composition containing a fluorinated copolymer (A) having repeating units based on tetrafluoroethylene and repeating units based on ethylene; and at least one charge aid (B) selected from the group consisting of a compound having at least one amino group and at least one reactive functional group (excluding an amino group) and a compound having at least two amino groups and having no reactive functional group (excluding an amino group).

Abstract: This invention relates to a method for producing a fluorinated copolymer composition, capable of uniformly mixing a fluorinated copolymer (A) having repeating units derived from ethylene and repeating units derived from tetrafluoroethylene, and a thermoplastic resin (B), at a relatively low temperature. The invention also relates to a method for producing a fluorinated copolymer composition comprising a fluorinated copolymer (A), a thermoplastic resin (B) which excludes the fluorinated copolymer (A), and a medium (C) capable of dissolving at least the fluorinated copolymer (A). The invention also relates to a coating composition capable of forming a coating film provided with characteristics of the fluorinated copolymer (A) and the thermoplastic resin (B), an article having such a coating film, and a molded product.

Abstract: An electret in disclosed including a laminate. A layer (A) containing a resin (a) and a layer (B) containing a resin (b) other than the resin (a) or an inorganic substance (c) are directly laminated. The resin (a) is a fluororesin (a1), or a resin (a2) having an alicyclic structure and containing no fluorine atom. The layer (B) is disposed on the outermost surface on a side opposite to the side where electric charge is injected at the time of injecting electric charge into the laminate to form the electret.

Abstract: An electret having a high surface charge density, is provided and along with an electrostatic induction conversion device including such an electret. In some embodiments, the electret includes a laminate having a layer (A) containing a polymer compound (a) having a relative dielectric constant of from 1.8 to 3.0 and a layer (B) containing a polymer compound (b) or inorganic substance (c) having a relative dielectric constant higher than the polymer compound (a). The difference between the relative dielectric constant of the polymer compound (b) or inorganic substance (c) and the relative dielectric constant of the polymer compound (a) is at least 0.3. The layer (A) is disposed on the outermost surface on a side opposite to the side where electric charge is injected at the time of injecting electric charge into the laminate to form the electret; and the layer (B) has a thickness of at least 1 ?m.

Abstract: To provide an electret having a high surface voltage, and an electrostatic induction conversion device comprising such an electret. An electret comprising a laminate wherein a layer (A) containing a resin (a) and a layer (B) containing a resin (b) other than the resin (a) or an inorganic substance (c) are directly laminated, wherein the resin (a) is a fluororesin (a1), or a resin (a2) having an alicyclic structure and containing no fluorine atom; and the layer (B) is disposed on the outermost surface on a side opposite to the side where electric charge is injected at the time of injecting electric charge into the laminate to form the electret.

Abstract: To provide an electret having a high surface charge density, and an electrostatic induction conversion device comprising such an electret. An electret comprising a laminate wherein a layer (A) containing a polymer compound (a) having a relative dielectric constant of from 1.8 to 3.0 and a layer (B) containing a polymer compound (b) or inorganic substance (c) having a relative dielectric constant higher than the polymer compound (a) are directly laminated, wherein the difference between the relative dielectric constant of the polymer compound (b) or inorganic substance (c) and the relative dielectric constant of the polymer compound (a) is at least 0.3; the layer (A) is disposed on the outermost surface on a side opposite to the side where electric charge is injected at the time of injecting electric charge into the laminate to form the electret; and the layer (B) has a thickness of at least 1 ?m.