| 摘要 |
PROBLEM TO BE SOLVED: To provide a crystallized glass powder negatively large in coefficient of thermal expansion even if a particle size is small and having a high transmittance to ultraviolet rays, and an UV curing type cured material containing the crystallized glass powder. SOLUTION: The crystallized glass powder comprises crystallized glass having a coefficient of thermal expansion of -8×10<SP>-7</SP>/°C or smaller in a temperature range of -40 to 100°C and a light transmittance of 50% or larger at a thickness of 1 mm in a wavelength of 350 nm, and an average particle size of 50μm or smaller. Further, the UV curing type resin cured material comprises the crystallized glass powder including crystallized glass having a coefficient of thermal expansion of -8×10<SP>-7</SP>/°C or smaller in a temperature range of -40 to 100°C and a light transmittance of 50% or larger at a thickness of 1 mm in a wavelength of 350 nm, and an average particle size of 50μm or smaller; and a resin composition. COPYRIGHT: (C)2009,JPO&INPIT
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