SEALING AGENT FOR DISPLAY ELEMENT
This is to provide a sealing agent for a display element which shows not only good elasticity, adhesiveness and durability which are characteristic features of the polyorganosiloxane, but also low moisture permeability after curing. It is a sealing agent for a display element comprising (A) 100 parts by weight of a linear polyorganosiloxane represented by the formula (I); (B) a polyorganohydrogen siloxane having hydrogen atoms bonded to a silicon atom in a number of exceeding 2 in the molecule in an amount where a number of hydrogen atoms bonded to a silicon atom per one alkenyl group existing in (A) being 0.5 to 10.0; (C) a compound of a platinum group metal in an amount where a platinum group metal atom being contained with 0.1 to 1,000 ppm by weight based on the amount of (A); and (D) 20 to 200 parts by weight of mica powder.
1 . A sealing agent for a display element which comprises
(A) 100 parts by weight of a linear polyorganosiloxane represented by the formula (I):
wherein
Rs independently represent R 1 or R 2 , and among Rs, at least two of which are R 1 s,
R 1 s independently represent a C 2 -C 6 alkenyl group,
R 2 s independently represent a C 1 -C 6 alkyl group or a phenyl group, and
n is a number which makes a viscosity of (A) at 23° C. 0.1 to 1,000 Pa·s;
(B) a polyorganohydrogen siloxane having hydrogen atoms bonded to a silicon atom in a number of exceeding 2 in the molecule in an amount where a number of hydrogen atoms bonded to a silicon atom per one alkenyl group existing in (A) being 0.5 to 10.0;
(C) a compound of a platinum group metal in an amount where a platinum group metal atom being contained with 0.1 to 1,000 ppm by weight based on the amount of (A); and
(D) 20 to 200 parts by weight of mica powder.
2 . The sealing agent for a display element according to claim 1 , wherein R 1 of (A) is a vinyl group.
3 . The sealing agent for a display element according to claim 1 , wherein among R 2 of (A), 15 mol % or more is a phenyl.
4 . The sealing agent for a display element according to claim 1 , wherein R 2 of (A) is a methyl group or a phenyl group, and among R 2 , 15 mol % or more is a phenyl group.
5 . The sealing agent for a display element according to claim 1 , wherein an average particle size of (D) is 2.0 to 100 μm.
6 . The sealing agent for a display element according to claim 1 , wherein it is for a liquid crystal display device.
7 . A flat display device sealed by the sealing agent for a display element according to claim 1 .
8 . The sealing agent for a display element according to claim 2 , wherein among R 2 of (A), 15 mol % or more is a phenyl.
9 . The sealing agent for a display element according to claim 2 , wherein R 2 of (A) is a methyl group or a phenyl group, and among R 2 , 15 mol % or more is a phenyl group.
10 . The sealing agent for a display element according to claim 3 , wherein R 2 of (A) is a methyl group or a phenyl group, and among R 2 , 15 mol % or more is a phenyl group.
11 . The sealing agent for a display element according to claim 2 , wherein an average particle size of (D) is 2.0 to 100 μm.
12 . The sealing agent for a display element according to claim 3 , wherein an average particle size of (D) is 2.0 to 100 μm.
13 . The sealing agent for a display element according to claim 4 , wherein an average particle size of (D) is 2.0 to 100 μm.
14 . The sealing agent for a display element according to claim 2 , wherein it is for a liquid crystal display device.
15 . The sealing agent for a display element according to claim 3 , wherein it is for a liquid crystal display device.
16 . The sealing agent for a display element according to claim 4 , wherein it is for a liquid crystal display device.
17 . The sealing agent for a display element according to claim 5 , wherein it is for a liquid crystal display device.
18 . A flat display device sealed by the sealing agent for a display element according to claim 2 .
19 . A flat display device sealed by the sealing agent for a display element according to claim 3 .
20 . A flat display device sealed by the sealing agent for a display element according to claim 4 .
21 . A flat display device sealed by the sealing agent for a display element according to claim 5 .