TECHNOLOGY FOCUS - POLYMERS - Preferred Epoxy Resin: The dicyclopentadiene group structure of the epoxy resin is represented by formula (1). Especially, the epoxy resin contains 20-75 wt.% of epoxy resin having dicyclopentadiene group structure, and 3-50 wt.% of inorganic oxide with respect to the whole epoxy resin. The epoxy resin further contains a cycloaliphatic epoxy resin. The inorganic oxide with average particle diameter of 10 nm to 50 mum is uniformly dispersed in the epoxy resin.R1-R3 = H or alkyl; andn = polymerization degree.Preferred Sheet: The particle dispersion group resin sheet contains a hard coat layer and a gas barrier layer. The hard coat layer contains urethane resin. The resin sheet has coefficient of linear expansion of less than 5 x 10 to the power of -5 /degrees C at 25-160 degrees C, glass transition temperature (Tg) of 170 degrees C or more, light transmittance of 88% or more and fracture strength of more than 20N.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Inorganic Oxide: The inorganic oxide is at least one of soda glass, alkali free glass, silica, titanium dioxide, antimony oxide, titania, alumina, zirconia and tungsten oxide. EXAMPLE - Dicyclopentadiene group epoxy resin of formula (1) (in wt.pts) (26.6), HP-7200 (RTM; 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexane carboxylate of formula (2)) (26.6), methyl hexahydrophthalic anhydride of formula (3) (48.5) and tetra-n-butyl phosphonium-o,o-diethyl phosphoro dithionate of formula (4) (1) were stir-mixed to form epoxy resin liquid. Glass beads having specific gravity of 2.5 and average particle diameter of 30 mum (340) were added to the obtained epoxy resin liquid (840). The content was stir-mixed to form epoxy resin liquid-containing inorganic oxide. Urethane acrylate of formula (5) was suspended in toluene to form 17 wt.% of urethane acrylate solution. Polyvinyl alcohol (PVA) having polymerization degree of 1800 was suspended in water to form 5.5 wt.% of PVA aqueous solution. The urethane acrylate solution was spread on an endless belt, air dried and hardened by UV irradiation to form hard coat layer with thickness of 2 mum. The PVA aqueous solution was spread on the hard coat layer and dried to form gas barrier layer with thickness of 3.7 mum. The epoxy resin liquid was spread on the gas barrier layer and cured at 200 degrees C for 60 minutes to form epoxy resin layer with thickness of 300 mum. A laminate was obtained. The laminate was peeled from the endless belt, and left on a glass panel at 180 degrees C for 0.5 hours in an atmosphere with substituted 0.5% of oxygen by nitrogen gas. The obtained resin sheet had glass transition temperature (Tg) of 200 degrees C, light transmittance of 89%, coefficient of linear expansion of 4 x 10 to the power of -5/ degrees C, dimensional change rate of 0.03% and fracture strength of 35N.    R1-R3 = H; and    n = 0.2.