申请人:Sumitomo Chemical Company, Limited
公开号:EP2781531A1
公开(公告)日:2014-09-24
Provided is a polymer from which an encapsulant excellent in weather resistance and processability can be obtained when being used for an encapsulant for a solar cell. The polymer that has a main chain comprising repeating units represented by formula (1) and repeating units represented by formula (2) and satisfies requirements (a1), (a2), and (a3),
(a1) : the ratio of the number of the repeating units represented by formula (2) to the total number of the carbon atoms that constitute the main chain of the polymer is from 3.8% to 7.5%; (a2) : the ratio X represented by formula (3) is from 82% to 100%; X=100×A/B
(a3) : the polymer has a melting point of 42°C to 90°C as measured with a differential scanning calorimeter.
本发明提供了一种聚合物,用它制成的封装剂在用于太阳能电池的封装剂时可获得优异的耐候性和加工性。该聚合物的主链由式(1)表示的重复单元和式(2)表示的重复单元组成,并满足(a1)、(a2)和(a3)的要求、
(a1) 式(2)代表的重复单元数与构成聚合物主链的碳原子总数之比为 3.8%至 7.5%; (a2) 式(3)代表的比率 X 为 82%至 100%;X=100×A/B
(a3) : 用差示扫描量热计测量,聚合物的熔点为 42°C 至 90°C。