Solar cell sealing material and solar cell module produced using the same

摘要

There is provided an encapsulant material for solar cells which facilitates production of a solar cell module and is excellent in flexibility, heat resistance, transparency, etc., and a solar cell module produced using the encapsulant material. The present invention relates to an encapsulant material for solar cells which includes a resin composition (C) containing an ethylene-α-olefin random copolymer (A) capable of satisfying the following condition (a) and an ethylene-α-olefin block copolymer (B) capable of satisfying the following condition (b): (a) a heat of crystal fusion is from 0 to 70 J/g as measured in differential scanning calorimetry at a heating rate of 10° C./min; and (b) a crystal fusion peak temperature is 100° C. or higher and a heat of crystal fusion is from 5 to 70 J/g as measured in differential scanning calorimetry at a heating rate of 10° C./min.

主权项

1. A encapsulant material for solar cells, comprising a resin composition (C) comprising an ethylene-α-olefin random copolymer (A) that satisfies the following condition (a) and an ethylene-α-olefin block copolymer (B) that satisfies the following condition (b):
(a) a heat of crystal fusion is from 0 to 70 J/g as measured in differential scanning calorimetry at a heating rate of 10° C./min; and (b) a crystal fusion peak temperature is 100° C. or higher and a heat of crystal fusion is from 5 to 70 J/g as measured in differential scanning calorimetry at a heating rate of 10° C./min; wherein the content of the ethylene-α-olefin random copolymer (A) in the resin composition (C) is from 50 to 99% by mass based on the content of the resin composition (C); and wherein the content of the ethylene-α-olefin block copolymer (B) in the resin composition (C) is from 1 to 50% by mass based on the content of the resin composition (C); and wherein the content of the α-olefin copolymerized with ethylene in the ethylene-α-olefin random copolymer (A) is less than 40 mol % on the basis of 100 mol % of whole monomer units contained in the ethylene-α-olefin random copolymer (A); and wherein the encapsulant material has a total light transmission of 85% or more where total light transmission is measured by a method of interposing a 0.5 mm-thick sheet-like encapsulant material between two pieces of 3 mm-thick opaque glass (size: 75 mm in length×25 mm in width), and press-laminated together at 150° C. for 15 min using a vacuum press laminating machine to prepare a sample and the total light transmission of the thus obtained sample is measured according to JIS K 7105.