Toray Films Europe

Timothy Stevenson

Julien Faldysta

Valerie Lacrampe

Karine Billard

Naoki Kawaji

Hideki Fujii

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 TiOparticles. In this film: at least one layer comprises a PET whose: number average molecular weight is within [18500-40000]; intrinsic viscosity IV is &#x2267;0.70 dL/g; and carboxyl group content is &#x2266;30 eq/T. Additionally, the core layer comprises TiOparticles 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&#xb0; 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.

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Saint-Maurice-de-Beynost, France

Timothy Stevenson