ORGANIC-INORGANIC HYBRID PREPOLYMER, ORGANIC-INORGANIC HYBRID POLYMER OBTAINED FROM SAME, SEALING MATERIAL FOR LED ELEMENTS AND SEALING STRUCTURE FOR LED ELEMENTS

摘要

This organic-inorganic hybrid prepolymer (C), which forms a cured body (a sealing body) that has excellently high light transmittance in the UV region and excellent heat resistance (flexibility) and is not susceptible to the occurrence of cracks due to thermal stress, is produced by a condensation reaction between a polydimethyl siloxane (A) that has silanol groups at both ends and has a number average molecular weight (Mn) of from 10,000 to 100,000 (inclusive) and a molecular weight distribution index (Mw/Mn) of 1.7 or less and one or more compounds (B) that are selected from the group consisting of oligomers of tetraalkoxy silane, complete or partial hydrolysis products of the alkoxy groups of the oligomers, and condensation reaction products of the hydrolysis products or condensation reaction products of one of the hydrolysis products and an unhydrolyzed material. An organic-inorganic hybrid polymer of the present invention is obtained by heating and curing the organic-inorganic hybrid prepolymer (C) by itself or a mixture of the organic-inorganic hybrid prepolymer (C) and an organic metal compound-containing solution (D).