Bridgestone Corporation

Yoshihiko Inoue

Hisataka Kataoka

Tetsuro Ikeda

Tokuo Okada

Makiko Shimada

The object of the present invention is to provide a solar cell sealing film obtained from a composition comprising chiefly ethylene-vinyl acetate copolymer and organic peroxides for giving crosslinked structure, which suppresses the occurrence of blisters without reduction of crosslink rate, even if the film contains silane-coupling agents for improving adhesive strength. The solar cell sealing film comprises ethylene-vinyl acetate copolymer, an organic peroxide, a silane-coupling agent, and a phosphite compound represented by formula (I):P(OR)&#x2003;&#x2003;(I)wherein, Ris a branched-chain aliphatic alkyl group having 8 to 14 carbon atoms, and three Rs are the same as or different from each other and further wherein the content of the vinyl acetate recurring unit of the ethylene-vinyl acetate copolymer is in the range of 20 to 35% by weight.

Solar cell sealing film and solar cell using the sealing film

The object of the present invention to provide a solar cell sealing film, which has superior durability that maintains adhesive performance for a long duration under the circumstances of a high temperature and high humidity, exerts high crosslink rate at production of the solar cells, and suppresses occurrence of blister, and a solar cell using the sealing film. The solar cell sealing film includes: ethylene-polar monomer copolymer, an organic peroxide, and a silane-coupling agent, wherein the silane-coupling agent is represented by formula (I): in which Rrepresents alkyl group having 1 to 3 carbon atoms, three Rs are the same as or different from each other, and 'n' is an integer of 1 to 8; and the silane-coupling agent is contained in the range of 0.02 to 1.0 parts by weight based on 100 parts by weight of the ethylene-polar monomer copolymer.

The present invention is to provide a solar cell sealing film which suppresses occurrence of rust on conducting wires or electrodes and which is improved in transparency and generating efficiency of the solar cell, and a solar cell having the sealing film. The solar cell sealing film comprises ethylene-vinyl acetate copolymer, a crosslinker and an adsorbent, which comprises, as the adsorbent, an inorganic fine particle having refractive index of not more than 1.54 in an amount of 0.1 to 1.5 part by weight based on 100 parts by weight of the ethylene-vinyl acetate copolymer.

The object of the present invention to provide an ethylene-unsaturated ester copolymer film used for forming a laminate, which is provided with emboss having effect on prevention on blocking during storage of the film, and which has good tackiness that is required for alignment in a laminating step. A filmfor forming a laminate, which is formed from a composition comprising an ethylene-unsaturated ester copolymer and has emboss only on one surfaceof the film, wherein a surfaceopposite to the surface having emboss is provided with a fine asperity, the surfaceprovided with the fine asperityhaving a surface roughness profile with a mean spacing between peaks (Sm) of 600 to 1600 &#x3bc;m and an arithmetical mean roughness (Ra) of 1.2 to 2.2 &#x3bc;m.

Ethylene-unsaturated ester copolymer film for forming laminate

Sealing film for solar cell which prevents conducting wires and electrodes of the solar cell from rusting and thereby enable the solar cell to retain its high photovoltaic performance for a long period. A light receiving surface sealing film for solar cell comprising ethylene-vinyl acetate copolymer, a cross-linking agent and an acid acceptor. A rear surface sealing film for solar cell comprising ethylene-vinyl acetate copolymer, a cross-linking agent and an acid acceptor, wherein the acid acceptor is contained in the range of not less than 0.5 parts by weight based on 100 parts by weight of ethylene-vinyl acetate copolymer.

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Yokohama, Japan

Yoshihiko Inoue