Abstract: Provided is an energy conversion film excellent in charge retention performance and suppressed in deterioration of piezoelectricity even if it is exposed to a high temperature environment and an energy conversion element and the like using the film. An energy conversion element comprising: an energy conversion film at least comprises a charged resin film consisting of a resin film at least containing a thermoplastic resin and a metal soap; and an electrode provided on at least one of the two surfaces of the energy conversion film.

Abstract: The electret-treated sheet includes: a core layer (A) which is a porous film containing at least a thermoplastic resin; a surface layer (X) disposed on one side of the core layer (A); and a back surface layer (Y) disposed on the other side of the core layer (A), the surface layer (X) and the back surface layer (Y) each having a charged outermost surface, wherein the electret-treated sheet has a water vapor permeability coefficient of 0.1 to 2.5 g·mm/m2·24 hr; the core layer (A) has a pore aspect ratio of 5 to 50 and an average pore height of 2.5 to 15 ?m; the surface layer (X) and the back surface layer (Y) each have a thickness of 5 to 200 ?m; and the surface layer (X) includes a heat seal layer (B) including the outermost surface, wherein the heat seal layer (B) has a melting point of 50 to 140° C.

Abstract: A sensor unit capable of protecting a piezoelectric element and detecting vibration and sound is provided. The sensor unit comprises a sheet-like piezoelectric element having a porous layer, and a sound propagation sheet covering at least one face of the piezoelectric element and permitting transmission of sound from a first face toward a second face of the sound propagation sheet. A difference in acoustic pressure level between the sound incident on the sound propagation sheet and the transmitted sound is preferably no greater than 10 dB. A surface density of the sound propagation sheet is preferably from 0.03 g/m2 to 100 g/m2. The sound propagation sheet is preferably flexible and preferably has voids. The sensor unit preferably further comprises a sound insulation sheet covering another face of the piezoelectric element and substantially preventing transmission of sound from a second face toward a first face of the sound insulation sheet.

Abstract: Provision of a piezoelectric element which uses a lightweight and flexible electret material and an electrode layer which is also lightweight, has high conductivity and good flexibility to easily receive electrical signals from an electret, and has good durability. Additionally, provision of a musical instrument provided with such a piezoelectric element. A piezoelectric element comprising an electrode layer (B) on at least one surface of an electret material (A) having pores inside, wherein a porosity of the electret material (A) is 20 to 80%, the electrode layer (B) contains 20 to 70 mass % of a carbon fine particle, and a thickness of the electrode layer (B) is 2 to 100 ?m.

Abstract: Provided are a stretched porous film and a film for printing that give a small amount of carbon dioxide gas emissions and have slight curling. A stretched porous film formed by stretching a resin composition comprising at least a polyethylene resin and an inorganic filler at least in a uniaxial direction, the polyethylene resin comprises a plant-derived polyethylene resin.

Abstract: The electret-treated sheet includes: a core layer (A) which is a porous film containing at least a thermoplastic resin; a surface layer (X) disposed on one side of the core layer (A); and a back surface layer (Y) disposed on the other side of the core layer (A), the surface layer (X) and the back surface layer (Y) each having a charged outermost surface, wherein the electret-treated sheet has a water vapor permeability coefficient of 0.1 to 2.5 g·mm/m2·24 hr; the core layer (A) has a pore aspect ratio of 5 to 50 and an average pore height of 2.5 to 15 ?m; the surface layer (X) and the back surface layer (Y) each have a thickness of 5 to 200 ?m; and the surface layer (X) includes a heat seal layer (B) including the outermost surface, wherein the heat seal layer (B) has a melting point of 50 to 140° C.

Abstract: A sensor unit capable of protecting a piezoelectric element and detecting vibration and sound is provided. The sensor unit comprises a sheet-like piezoelectric element having a porous layer, and a sound propagation sheet covering at least one face of the piezoelectric element and permitting transmission of sound from a first face toward a second face of the sound propagation sheet. A difference in acoustic pressure level between the sound incident on the sound propagation sheet and the transmitted sound is preferably no greater than 10 dB. A surface density of the sound propagation sheet is preferably from 0.03 g/m2 to 100 g/m2. The sound propagation sheet is preferably flexible and preferably has voids. The sensor unit preferably further comprises a sound insulation sheet covering another face of the piezoelectric element and substantially preventing transmission of sound from a second face toward a first face of the sound insulation sheet.

Abstract: A sensor unit capable of protecting a piezoelectric element and detecting vibration and sound is provided. The sensor unit comprises a sheet-like piezoelectric element having a porous layer, and a sound propagation sheet covering at least one face of the piezoelectric element and permitting transmission of sound from a first face toward a second face of the sound propagation sheet. A difference in acoustic pressure level between the sound incident on the sound propagation sheet and the transmitted sound is preferably no greater than 10 dB. A surface density of the sound propagation sheet is preferably from 0.03 g/m2 to 100 g/m2. The sound propagation sheet is preferably flexible and preferably has voids. The sensor unit preferably further comprises a sound insulation sheet covering another face of the piezoelectric element and substantially preventing transmission of sound from a second face toward a first face of the sound insulation sheet.

Abstract: An object of the present invention is to provide a low pressure-loss type of filter which has a high dust collecting capability and suppresses the lowering of the dust collecting capability even after cleaning. The present invention relates to an electret-treated sheet including at least a surface layer, a high dielectric layer and a back-surface layer, while having the high dielectric layer between the surface layer and the back-surface layer, wherein the surface layer and the back-surface layer are each a thermoplastic resin film having a relative dielectric constant of smaller than 6 at 100 kHz; the high dielectric layer is a material having a relative dielectric constant of 6 or larger at 100 kHz; and the surface layer and the back-surface layer each have a static charge due to electrostatically charge; and to a filter using the same.

Abstract: Provided is an energy conversion film excellent in charge retention performance and suppressed in deterioration of piezoelectricity even if it is exposed to a high temperature environment and an energy conversion element and the like using the film. An energy conversion element comprising: an energy conversion film at least comprises a charged resin film consisting of a resin film at least containing a thermoplastic resin and a metal soap; and an electrode provided on at least one of the two surfaces of the energy conversion film.

Abstract: Provision of a piezoelectric element which uses a lightweight and flexible electret material and an electrode layer which is also lightweight, has high conductivity and good flexibility to easily receive electrical signals from an electret, and has good durability. Additionally, provision of a musical instrument provided with such a piezoelectric element. A piezoelectric element comprising an electrode layer (B) on at least one surface of an electret material (A) having pores inside, wherein a porosity of the electret material (A) is 20 to 80%, the electrode layer (B) contains 20 to 70 mass % of a carbon fine particle, and a thickness of the electrode layer (B) is 2 to 100 ?m.

Abstract: A sensor unit capable of protecting a piezoelectric element and detecting vibration and sound is provided. The sensor unit comprises a sheet-like piezoelectric element having a porous layer, and a sound propagation sheet covering at least one face of the piezoelectric element and permitting transmission of sound from a first face toward a second face of the sound propagation sheet. A difference in acoustic pressure level between the sound incident on the sound propagation sheet and the transmitted sound is preferably no greater than 10 dB. A surface density of the sound propagation sheet is preferably from 0.03 g/m2 to 100 g/m2. The sound propagation sheet is preferably flexible and preferably has voids. The sensor unit preferably further comprises a sound insulation sheet covering another face of the piezoelectric element and substantially preventing transmission of sound from a second face toward a first face of the sound insulation sheet.

Abstract: An object of the present invention is to provide a low pressure loss filter having a high dust- and dirt-collecting capability and excellent workability and sustainability of collecting capability. The filter of the present invention is a filter having air channels formed using an electret sheet; a porosity of the electret sheet being from 1 to 70%; an air channel cross-sectional ratio of the filter being from 10 to 99%; and a volume charge density of the filter being from 10 to 5000 nC/cm3.

Abstract: An object of the present invention is to provide a low pressure loss filter having a high dust- and dirt-collecting capability and excellent workability and sustainability of collecting capability. The filter of the present invention is a filter having air channels formed using an electret sheet; a porosity of the electret sheet being from 1 to 70%; an air channel cross-sectional ratio of the filter being from 10 to 99%; and a volume charge density of the filter being from 10 to 5000 nC/cm3.

Abstract: An energy conversion film, which can hold a larger amount of charges by pores in the inside of the film and has high energy conversion performances, is provided, by obtaining a porous resin film with a high expansion ratio without adopting an expansion treatment with a high-pressure gas by forming a thermoplastic resin stretched film having a specified structure. The energy conversion film includes a core layer (A) having specified pores and composed of a thermoplastic resin stretched film including a thermoplastic resin and at least one of an inorganic powder and an organic filler.

Abstract: A readily removable film containing a substrate layer (A) and a readily removable layer (B), wherein the substrate layer (A) contains a thermoplastic resin, the readily removable layer (B) contains from 30 to 60% by weight of a mixture of a crystalline polypropylene resin having a degree of crystallinity of at least 65% and a thermoplastic resin immiscible with the crystalline polypropylene resin, and from 40 to 70% by weight of a fine powder, in which the thermoplastic resin immiscible with the crystalline polypropylene resin is blended in a ratio of from 105 to 300 parts by weight relative to 100 parts by weight of the crystalline polypropylene resin, and the readily removable layer (B) is stretched at least monoaxially.

Abstract: An electrophotographic recording sheet having, on a water-resistant support, a toner-receiving layer containing a liphophilic polymer antistatic agent with a specific surface resistivity of from 1×107 to 9×1012?. This electrophotographic recording sheet is excellent in recording quality, fixability, water resistance, durability, color printability and continuous printability.

Abstract: A readily removable film containing a substrate layer (A) and a readily removable layer (B), wherein the substrate layer (A) contains a thermoplastic resin, the readily removable layer (B) contains from 30 to 60% by weight of a mixture of a crystalline polypropylene resin having a degree of crystallinity of at least 65% and a thermoplastic resin immiscible with the crystalline polypropylene resin, and from 40 to 70% by weight of a fine powder, in which the thermoplastic resin immiscible with the crystalline polypropylene resin is blended in a ratio of from 105 to 300 parts by weight relative to 100 parts by weight of the crystalline polypropylene resin, and the readily removable layer (B) is stretched at least monoaxially.

Abstract: An electrostatic adsorbable sheet (iii) of the present invention is a laminate obtained by laminating an adsorbable sheet (i) including a resin film layer (A) having an adhesive layer (C) formed over one surface thereof with a support layer (ii) including a resin layer (B), wherein the resin film layer (A) of the adsorbable sheet (i) and the resin film layer (B) of the support layer (ii) are adherent to each other by electrostatic adsorption.

Abstract: An electrostatic adsorbable sheet (iii), which has a long-lasting adsorbability not easily affected by humidity, secures good ink adhesiveness, and does not generate troubles in a printing process, is provided. The electrostatic adsorbable sheet (iii) comprises a laminate of a label layer (i) containing a resin film layer (A) and a recording layer (D) on one surface of the resin film layer (A), and a peelable sheet layer (ii) containing a peelable layer (B) and a support layer (C), in which the label layer (i) and the peelable sheet layer (ii) are laminated so that the resin film layer (A) and the peelable layer (B) contact with each other. The peeling strength between the label layer (i) and the peelable sheet layer (ii) is from 1 to 50 g/cm, and the label layer (i) peeled from the peelable sheet layer (ii) is electrostatically adsorbable to an object to be attached.