Encapsulation composition for photovoltaic cell module and photovoltaic cell module comprising the same

An encapsulation composition comprising an ethylene-alpha olefin copolymer which satisfies the following General Formula 1;

• and a silane-modified ethylene-alpha olefin copolymer, wherein the ethylene-alpha olefin copolymer satisfying the following General Formula 1 has a melt flow index (MI) of 0.2 to 50 g/10 min,
• wherein the silane-modified ethylene-alpha olefin copolymer is contained in an amount of 10 to 900 parts by weight, based on 100 parts by weight of the ethylene-alpha olefin copolymer satisfying General Formula 1:
• Re×Rc≦1.0 [General Formula 1]
• wherein Re represents kee/kec, and Re represents kcc/kce, where kee represents a growth reaction rate constant when ethylene is added to a growing chain in which a terminal activating point is an ethylene monomer, kec represents a growth reaction rate constant when an alpha olefin comonomer is added to a growing chain in which a terminal activating point is an ethylene monomer, kcc represents a growth reaction rate constant when an alpha olefin comonomer is added to a growing chain in which a terminal activating point is an alpha olefin comonomer, and kce represents a growth reaction rate constant when an ethylene monomer is added to a growing chain in which a terminal activating point is an alpha olefin comonomer.