Abstract: The present invention provides a biaxially oriented polyester film for a backsheet of solar batteries which exhibits a good hydrolysis resistance and a low haze. The present invention relates to a biaxially oriented polyester film for a backsheet of solar batteries, comprising titanium in an amount of not more than 20 ppm in terms of a titanium atom, phosphorus in an amount of not more than 70 ppm in terms of a phosphorus atom, and antimony in an amount of not more than 10 ppm in terms of an antimony atom; and having a carboxyl end group content of not more than 26 equivalents/t and an intrinsic viscosity of 0.65 to 0.90.

Abstract: The present invention provides a biaxially oriented polyester film for a backsheet of photovoltaics which exhibits an excellent hydrolysis resistance and a low shrinkage rate. The present invention relates to a biaxially oriented polyester film for a backsheet of photovoltaics, comprising a polyester having an intrinsic viscosity of 0.65 to 0.90 dL/g as measured in a mixed solvent comprising phenol and tetrachloroethane at a mass ratio of 50/50 at 23° C., a carboxyl end group content of 0 to 26 equivalents/t, and a phosphorus element content of 0 to 170 ppm, which biaxially oriented polyester film has a shrinkage rate of not more than 0.8% as measured in a longitudinal direction thereof after subjected to heat treatment at 150° C. for 30 min.

Abstract: The present invention provides a biaxially oriented white polyethylene terephthalate film which can be produced at low costs and is excellent in environmental resistance (such as hydrolysis resistance and ultraviolet light resistance), and can be suitably used in the applications in which a high reflection efficiency and a reduced weight are required, and a backsheet for a photovoltaic module. The present invention relates to a biaxially oriented white polyethylene terephthalate film having a phosphorus element content of not more than 70 ppm by weight, a carboxyl end group content of not more than 26 equivalents/t, an intrinsic viscosity of not less than 0.65 dL/g, a white pigment concentration of 2.0 to 10.0% by weight and a thickness of not less than 175 ?m.

Abstract: The present invention provides a polyester film for a protective material for protecting a back surface of photovoltaic cell which exhibits a good hydrolysis resistance and an excellent adhesion property to a sealing resin for photovoltaic cells.

Abstract: The present invention provides a biaxially oriented polyester film for a backsheet of solar batteries which exhibits a good hydrolysis resistance and a low haze. The present invention relates to a biaxially oriented polyester film for a backsheet of solar batteries, comprising titanium in an amount of not more than 20 ppm in terms of a titanium atom, phosphorus in an amount of not more than 70 ppm in terms of a phosphorus atom, and antimony in an amount of not more than 10 ppm in terms of an antimony atom; and having a carboxyl end group content of not more than 26 equivalents/t and an intrinsic viscosity of 0.65 to 0.90.

Abstract: The present invention provides a biaxially oriented polyester film for a backsheet of photovoltaics which exhibits an excellent hydrolysis resistance and a low shrinkage rate. The present invention relates to a biaxially oriented polyester film for a backsheet of photovoltaics, comprising a polyester having an intrinsic viscosity of 0.65 to 0.90 dL/g as measured in a mixed solvent comprising phenol and tetrachloroethane at a mass ratio of 50/50 at 23° C., a carboxyl end group content of 0 to 26 equivalents/t, and a phosphorus element content of 0 to 170 ppm, which biaxially oriented polyester film has a shrinkage rate of not more than 0.8% as measured in a longitudinal direction thereof after subjected to heat treatment at 150° C. for 30 min.

Abstract: A release sheet comprising a release substrate and a release layer which comprises cross-linked polyolefin, is formed at least one side of said release substrate, and has from 10 to 300 mN/cm of release force to an adhesive layer formed from a 2 packs type acryl-based adhesive agent. The said release sheet has an excellent heat resistance, solvent resistance, adhesion between a release layer and a release substrate and capability of direct transfer coating of an adhesive layer on a release layer.

Abstract: A release agent for forming a release layer contacting with an adhesive layer, comprising (A) a polyolefin having a weight-average molecular weight of not less than 1×104, which may contain a functional group, and (B) a hydrocarbon having a viscosity of 1 to 1×104 cP as measured at 23° C. according to JIS K-7117, a weight ratio of the polyolefin (A) to the hydrocarbon (B) being 97:3 to 60:40. Such a release agent provides a novel release agent that is usable as an alternative material of a silicone-based and fluororesin-based release agents.

Abstract: A release agent comprising (A) an olefin-based elastomer having a density of not less than 0.855 g/cc and less than 0.868 g/cc, and (B) an ethylene-?-olefin copolymer having a density of from 0.868 g/cc to 0.970 g/cc as main components, wherein the difference in average density between the components (A) and (B) is not less than 0.005 g/cc and the mixing weight ratio of the component (A) to the component (B) is from 90:10 to 10:90. Such a release agent contains no silicone-based components generating undesired gasses, can exhibit not only a good releasability to various adhesives but also a less fluctuation in peeling force, and can maintain a low peeling force even when the release agent is bonded to an adhesive and preserved under a heating condition.