Encapsulant for PV module, method of manufacturing the same and PV module comprising the same

An encapsulant for a PV module, comprising:

• (a) a first ethylene/α-olefin-based copolymer prepared by polymerizing ethylene and a first α-olefin-based monomer;
• (b) a silane modified ethylene/α-olefin-based copolymer prepared by graft polymerizing a second ethylene/α-olefin-based copolymer and a silane compound, wherein the second ethylene/α-olefin-based copolymer is prepared by polymerizing ethylene and a second α-olefin-based monomer;
• and
• (c) a heat resistant polymer resin having a melting point (Tm) higher than the first ethylene/α-olefin-based copolymer (a),
• wherein the heat resistant polymer resin (c) is included at 0.01 parts by weight or more but less than 3 parts by weight with respect to 100 parts by weight of a mixture of the first ethylene/α-olefin-based copolymer (a) and the silane modified ethylene/α-olefin-based copolymer (b),
• wherein the first α-olefin-based monomer is the same as the second α-olefin-based monomer,
• wherein the silane modified ethylene/α-olefin-based copolymer (b) comprises a main chain including a polymerization unit of the second α-olefin-based monomer and a branched chain bound to the main chain, and the branched chain comprises a compound represented by Formula 3:
• —SiR12R13R14 [Formula 3]
• in the Formula 3,
• R12 and R13 are each independently halogen, an amine group, —R15R16 or —R16, wherein R15 is an oxygen (O) or sulfur (S) atom, R16 is hydrogen, an alkyl group, an aryl group, an aralkyl group, or an acyl group,
• R14 is —OSiR17mR18(2-m)R19, wherein R17 and R18 are each independently halogen, an amine group, —R20R21 or —R21, R20 is an oxygen (O) or sulfur (S) atom, R21 is hydrogen, an alkyl group, an aryl group, an aralkyl group, or an acyl group, R19 is —(CH2)nNR22R23, R22 and R23 are independently hydrogen bound to nitrogen atoms or R24NH2, R24 is an alkylene group, m is an integer of 1 or 2, and n is an integer of 1 or more.