Abstract:
PURPOSE: A curable composition is provided to have excellent processability and workability, and to have excellent light extracting efficiency, crack resistance, hardness, thermal resistance, and adhesion and to have excellent reliability in severe condition. CONSTITUTION: A curable composition comprises: a polymer reactant which comprises polyorganosiloxane having an aryl group combined to a silicon atom, and an aliphatic unsaturated bond; and 0.1-30 parts by weight of a particle which satisfies formula 1, : |A - B| Δ 0.1, based on 100.0 parts by weight of the polyorganosiloxane. In chemical formula 1, A is a refractivity of the curable composition, except for the particle, or the cured material thereof, and B is the refractivity of the particle.
Abstract:
Disclosed is a resin material for optical purposes, which has high light permeability and high refractive index stability against temperature variation. Also disclosed is an optical element utilizing the resin material. The resin material for optical purposes comprises a curable resin and an inorganic microparticle comprising two or more metal oxides having different refractive indexes and dispersed in the curable resin, wherein the inorganic microparticle has a refractive index distribution, has the surface treated with a surface-treating agent, and is at least partially modified with a surface-modifying agent having a polymerizable functional group, and wherein the refractive index of the curable resin after being cured (nh) and the refractive index of the inorganic microparticle (ng) meet the requirement represented by the formula (1).
Abstract:
Provided are a tire tread rubber composition for a bus or a truck which is improved in heat resistance and abrasion resistance, and a tire containing the tread comprising the composition. The tire tread rubber composition comprises 100 parts by weight of a rubber material which comprises a natural rubber and a butadiene rubber having a cis content of 98% or more; and 0.5-5 parts by weight of an aramid monofilament. Preferably the rubber material is 50-80 parts by weight of a natural rubber; and 50-80 parts by weight of a butadiene rubber having a cis content of 98% or more. Preferably the aramid monofilament has a Young's modulus of 20-22 GPa, a tensile strength of 3,000-35,000 MPa and an elongation of 1-10 %.