| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a millable type silicone rubber composition for obtaining an optical sheet for concentrated solar battery and an optical sheet for LED back light device, which is excellent in durability to solar light irradiation, in use as an organic material optical sheet of a concentrated photovoltaic solar cell capable of light collection by uniaxial tracking or without tracking, and also excellent in calender moldability and extrusion moldability, compared with a liquid type one to facilitate shaping of a solar light collection part; and an optical sheet obtained by curing the same. <P>SOLUTION: The millable type silicone rubber composition includes, as essential components: (A) 100 pts.wt. of an organopolysiloxane represented by the following average compositional formula (I) and having a polymerization degree of at least 100; R<SP POS="POST">1</SP><SB POS="POST">a</SB>SiO<SB POS="POST">(4-a)/2</SB>(I), wherein each of R<SP POS="POST">1</SP>is identical or different unsubstituted or substituted monovalent hydrocarbon group, and a is positive number of 1.95 to 2.05; (B) 70 to 150 pts.wt. of fumed silica having a specific surface area of more than 200 m<SP POS="POST">2</SP>/g; (C) 0.1 to 30 pts.wt. of an organohydrogen polysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule; and (D) 0.1 to 10 pts.wt. of a hydrosilylation reaction catalyst. <P>COPYRIGHT: (C)2012,JPO&INPIT |
