Polysiloxane-based composition and hardened material obtained therefrom



【課題】成型加工性、透明性、耐熱性、耐光性に優れ、さらには、高温加熱時の耐クラック性に優れる、特には液状の多面体構造ポリシロキサンを用いることを特徴とするポリシロキサン系組成物と硬化物を提供する。 【解決手段】アルケニル基および/またはヒドロシリル基を含有する多面体構造ポリシロキサン系化合物(a)に対して、前記(a)成分とヒドロシリル化反応可能なヒドロシリル基および/またはアルケニル基を有する化合物(b)を変性して得られた多面体構造ポリシロキサン変性体(A)、および、硬化剤(B)、を必須成分としてなるポリシロキサン系組成物であって、前記(B)の130℃における重量減少が、2.5%以下であることを特徴とする、ポリシロキサン系組成物。 【選択図】なし
PROBLEM TO BE SOLVED: To provide a polysiloxane-based composition which is excellent in crack resistance during high-temperature heating, in addition to moldability, transparency, heat resistance and light resistance, and particularly, which uses liquid polyhedral structure polysiloxane, and to provide a hardened material thereof.SOLUTION: A polysiloxane-based composition includes: as essential components, a polyhedral structure polysiloxane modified body (A) which is obtained by modifying a polyhedral structure polysiloxane-based compound (a) containing an alkenyl group and/or hydrosilyl group with a compound (b) having a hydrosilyl group and/or alkenyl group, which can be hydrosilylated with the component (a); and hardening agents (B). The weight reduction at 130°C of (B) is 2.5% or less.




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