Abstract: The invention concerns a multilayer biaxially oriented white polyester film (adhesion, absence of chalking, opacity whiteness, reflectance, hydrolysis resistance & light stability) comprising three polyester layers: a core layer and two outer layers and contains TiO2 particles. In this film: at least one layer comprises a PET whose: number average molecular weight is within [18500-40000]; intrinsic viscosity IV is ?0.70 dL/g; and carboxyl group content is ?30 eq/T. Additionally, the core layer comprises TiO2 particles in a range of [0.1-40]% w/w; the intrinsic viscosity IV is between [0.5-0.85] dL/g; a small endothermic peak temperature is between 180-230° C.; and at least one light stabilizer is added in at least one of the outer layers, in a total concentration between [0.1-35]% w/w. The invention also includes the method for manufacturing such film and the laminate which is part of the back sheet of a solar cell.

Abstract: The invention concerns a multilayer biaxially oriented white polyester film (adhesion, absence of chalking, opacity whiteness, reflectance, hydrolysis resistance & light stability) which has three polyester layers: a core layer and two outer layers and contains TiO2 particles. In this film: (i) at least one layer includes a PET whose: number average molecular weight is within [18500-40000]; intrinsic viscosity IV is ?0.70 dL/g; carboxyl group content is ?30 eq/T (ii) the core layer includes TiO2 particles [0.1-40]% w/w; (iii) the intrinsic viscosity IV of the film is between [0.5-0.85] dL/g; (iv) a small endothermic peak temperature is between 180-230° C.; (v) at least one light stabilizer is added in at least one of the outer layers, in a total concentration between [0.1-35]% w/w. The invention also includes the method for manufacturing such film and the laminate which includes the above multilayered film and which is part of the back sheet of a solar cell.

Abstract: A method of producing sealing film for photovoltaic cell module including a layer composed of at least one substance selected from the group consisting of metals, metal oxides, and inorganic compounds; and a polyester film having a thermal shrinkage ratio within (0±2)% at 150° C. in both length-wise and width-wise directions, and difference between the thermal shrinkage ratios at 150° C. in the length-wise and width-wise directions of 2% or less.

Abstract: A seal film for solar cell module includes a resin film layer including a biaxially oriented film layer formed of a resin composition containing poly-p-phenylene sulfide as a major component; and a gas barrier layer formed of at least one selected from the group consisting of a metal, a metal oxide, an inorganic compound, and an organic compound. In the seal film for solar cell module, longitudinal and width direction heat shrink ratios at 150° C. of the seal film for solar cell module both fall within a range of ?2.0% to +2.0%, and an absolute value of a difference between the longitudinal and width direction heat shrink ratios at 150° C. is 2.0% or less.

Abstract: A photovoltaic cell module sealing film including a layer composed of at least one substance selected from the group consisting of metals, metal oxides, and inorganic compounds; and a polyester film having a thermal shrinkage ratio within (0±2) % at 150° C. in both length-wise and width-wise directions, and a difference between the thermal shrinkage ratios at 150° C. in the length-wise and width-wise directions of 2% or less.