NOVELTY - A modified resin composition is obtained by reacting an alkoxysilane compound in the presence of an epoxy resin. The alkoxysilane compound comprises compound(s) (B) having cyclic ether group(s), and compound (C) having phenyl having fluoro(s) as substituent. The mixing index of alkoxysilane compound is 0.001-19 as measured by the ratio of content (mol%) of compound (B) in alkoxysilane compound and content (mol%) of compound (C) in alkoxysilane compound.    USE - Modified resin composition is used for curable resin compositions used for manufacturing light-emitting components e.g. LEDs used in semiconductor devices (all claimed) e.g. backlights of LCDs, and light sources of sensors, printers, vehicles, measuring instruments, and signaling lamps. Can also be used for coating materials of eyeglass lenses, lenses used for pick-up of compact disks or DVDs, lenses used for automobile headlamps, projector lenses, optical fibers, optical waveguides, and light filters; coating agents of building materials and optical fibers; resist compositions; industrial electrodeposition coating of cans used for drinks; woodwork; wire enamels; primers of motor vehicle components; adhesive agents used in optics; optical disk substrates, display substrates, antireflective films, and passivation film on die-bonding materials; luminous materials used for, e.g. reflecting plates, fishing implements, timepiece, wallpapers, signboards, adhesive tapes, sports equipment, and toys; conductive resin composition used for crystal resonators, alternating current transformers, rotary machine coils, printed wiring boards, conductive paints, and electrodes; insulating resin composition used for mounting semiconductor chips in semiconductor devices, die-bonding agents, solar cells, and interposers of semiconductor packages; surface coatings of pipes and tanks used in chemical processing plants, aircraft components, carbon composites, aramid fiber composites, and sports products; corrosion-proof and waterproof coatings of precast-concrete joints and tiles; and jigs used for testing.    ADVANTAGE - The modified resin composition has excellent transparency, fluidity, dispersion stability, adhesiveness, insulating property, and storage stability, and provides cured material having excellent heat-resistant yellowing resistance, light resistance under heating conditions, crack resistance, dimensional stability, and anti-cold thermal impact property in a thermal cycle. The cured material provides light-emitting components having excellent brightness.    DETAILED DESCRIPTION - A modified resin composition is obtained by reacting an alkoxysilane compound of formula: (R1)n-Si-(OR2)4-n in the presence of an epoxy resin. The alkoxysilane compound comprises compound(s) (B) in which n is 1 or 2, and R1 is cyclic ether group(s), and compound (C) in which n is 1 or 2, and R1 is phenyl having fluoro(s) as substituent. The mixing index of alkoxysilane compound is 0.001-19 as measured by the ratio of content (mol%) of compound (B) in alkoxysilane compound and content (mol%) of compound (C) in alkoxysilane compound.    n=0-3;    R1=H, optionally substituted linear, branched or cyclic 4-24C aliphatic hydrocarbyl having cyclic ether group with 1-5 oxygen atoms, optionally substituted linear, branched or cyclic 1-24C monovalent aliphatic hydrocarbyl having 0-5 oxygen atoms, or optionally substituted aromatic hydrocarbyl or linear, branched or cyclic aliphatic hydrocarbyl, having 6-24 carbon atoms and 0-5 oxygen atoms;and    R2=H, or optionally substituted monovalent linear, branched or cyclic 1-8C aliphatic hydrocarbyl.    INDEPENDENT CLAIMS are included for the following:    (1) manufacture of modified resin composition, which involves carrying out cohydrolysis of the alkoxysilane compound by reflux process without distillation of water or solvent, in the presence of epoxy resin, and dehydrate-condensing the obtained intermediate; and    (2) curable resin composition obtained by adding a curing agent and a hardening accelerator to the modified resin composition.