An object of the present invention is to provide a material used for producing a sheet for sealing a solar cell which is excellent in mechanical strength, solar cell sealing property and transparency if the material is not cross-linked.
The thermoplastic resin composition of the present invention for sealing a solar cell is characterized by comprising:
(A) 0 to 70 parts by weight of a propylene-based polymer having a melting point of 100° C. or higher and
(B) 30 to 100 parts by weight of a propylene-based copolymer satisfying the following requisite (b);
(b): MFR (230° C., load: 2.16 kg) falls in a range of 0.01 to 100 g/10 minutes, and at least one of the following requisites (b-1) and (b-2) is satisfied;
(b-1): an rr fraction is 60% or more and
(b-2): a structural unit derived from propylene is contained in an amount of 55 to 90 mole %, and a structural unit derived from α-olefin having 2 to 20 carbon atoms (excluding propylene) is contained in an amount of 10 to 45 mole %; and an intrinsic viscosity [η] (dL/g) measured in decalin at 135° C. and MFR described above satisfy a specific relational equation.
本发明的目的是提供一种用于制造太阳能电池密封片的材料,如果该材料未交联,则在机械强度、太阳能电池密封性和透明度方面优异。本发明的用于密封太阳能电池的热塑性
树脂组合物的特征在于包括:(A)具有100°C或更高熔点的
丙烯基聚合物的0至70重量部分和(B)满足以下必要条件(b)的
丙烯基共聚物的30至100重量部分;(b):MFR(230°C,负载:2.16公斤)在0.01至100克/10分钟的范围内,且满足以下至少一个必要条件(b-1)和(b-2)之一;(b-1):rr分数为60%或更高,(b-2):从
丙烯基衍生的结构单元的含量为55至90摩尔%,从具有2至20个碳原子(不包括
丙烯)的α-烯烃衍生的结构单元的含量为10至45摩尔%;并且在135°C的
十二烷基中测量的固有粘度[η](dL/g)和上述MFR满足特定的关系式。