Abstract: The invention relates to a radiation curable adhesive system for use in bonding a high thermal deformation temperature layer to a UV opaque, pigmented or non-pigmented fluoropolymer film The radiation curable adhesive system uses an adhesive composition optimized for cure using long wavelength UV energy. The adhesive system may also be optimized for curing by LED or e-beam radiation. The system is designed for curing through a UV opaque fluoropolymer film—and especially where titanium dioxide is used as the pigment. A preferred multilayer film structure is a polyvinylidene fluoride (PVDF)/curable adhesive/polyester terephthalate (PET) structure. This film structure is especially useful as a backsheet for a photovoltaic module.

Abstract: The invention relates to a method of encapsulating a photovoltaic cell comprising curing an encapsulation composition comprising (i) a polyvinyl acetal resin/polymer, (ii) one or more ethylenically unsaturated monomers, oligomers, or a combination thereof, and (iii) at least one thermal free radical initiator and/or at least one photoinitiator. The resin/polymer is either a polyvinyl acetate derivative or a polyvinyl acetate copolymer such as EVA derivative, and comprises vinyl acetal units. The invention also relates to a photovoltaic cell encapsulated according to the method and to the encapsulation curable composition.

Abstract: The invention relates to a method of encapsulating a photovoltaic cell comprising curing an encapsulation composition comprising (i) a polyvinyl acetal resin/polymer, (ii) one or more ethylenically unsaturated monomers, oligomers, or a combination thereof, and (iii) at least one thermal free radical initiator and/or at least one photoinitiator. The resin/polymer is either a polyvinyl acetate derivative or a polyvinyl acetate copolymer such as EVA derivative, and comprises vinyl acetal units. The invention also relates to a photovoltaic cell encapsulated according to the method and to the encapsulation curable composition.