ACRYLATE-BASED COMPOSITION

摘要

The present invention is a composition which comprises (A) one or more compounds selected from (meth)acrylate-modified silicone oils, long-chain-alkyl (meth)acrylates, and polyalkylene glycol (meth)acrylates, (B) a (meth)acrylate compound including an alicyclic hydrocarbon group bonded through an ester linkage, (C) (meth)acrylic acid or a (meth)acrylate compound having a polar group, (D) a free-radical polymerization initiator, and (E) fine silica-based particles having an average particle diameter of 0.1-500 µm or silica-based fibers having an average fiber diameter and a fiber length of 0.1-500 µm each, the content of component (E) being 5-500 parts by mass per 100 parts by mass of the sum of components (A), (B), and (C). This composition is suitable for use as a raw material for encapsulants. The composition gives a cured object which, in a thermal shock test, prevents the gold wires from developing a breakage failure and which can scatter the light emitted by the optical semiconductor, while retaining heat resistance and adhesion on the conventional levels.