Patent ID: 8026332
Filing Date: 2011-09-27
Classification: C08G,C08K,H01L

Abstract:
1. A sealing material for optical elements, comprising: a polysilsesquioxane compound with a ladder structure, which contains a repeating unit of the following formula (A) in the molecule as a major component, wherein R the polysilsesquioxane compound being obtained by condensing a silane compound (1) shown by the formula (1), R wherein a cured product of the sealing material that has been heated at 150° C. for 100 hours has a transparency to light having a wavelength of 400 nm of 73% or more than that of a cured product before being heated at 150° C. for 100 hours; wherein the phosphoric acid catalyst is a compound shown by the following formula (3) or the following formula (4), wherein R wherein R