NOVELTY - Composite film comprises a substrate (A) of inorganic fibers impregnated by a resin, where the resin is obtained by the polymerization of a composition (B) comprising: a first monomer (B1) having an index of refraction higher than the inorganic fibers; and a second monomer (B2) having an index of refraction lower than the inorganic fibers, the second monomer (B2) consisting of a triazinetrione derivate having at least one polymerizable substituted group.    USE - The composite film useful for manufacturing electronic display devices, photovoltaic devices, lighting devices, automotive windshields and lights, and safety and armored windows.    ADVANTAGE - The invention provides composite film or a layered product having high transparency, excellent resistance heat, and excellent dimensional stability.    DETAILED DESCRIPTION - Composite film comprises a substrate (A) of inorganic fibers impregnated by a resin, where the resin is obtained by the polymerization of a composition (B) comprising: a first monomer (B1) having an index of refraction higher than the inorganic fibers, the first monomer (B1) being selected from: (i) esters of 9,9'-bis(4-hydroxyphenyl)fluorene or its ethoxylated derivate with cinnamic acid or its derivates or crotonic acid or its derivates' (ii) mixed esters of 9,9'-bis(4-hydroxyphenyl)fluorene or its ethoxylated derivate with cinnamic acid or its derivates and acrylic or methacrylic acid; (iii) mixed esters of 9,9'-bis(4-hydroxyphenyl)fluorene or its ethoxylated derivate with crotonic acid and acrylic or methacrylic acid; (iv) ethers of 9,9'-bis(4-hydroxyphenyl)fluorene or its ethoxylated derivate with allylic alcohol, (v) monoesters of 9,9'-bis(4-hydroxyphenyl)fluorene monoallylether or its ethoxylated derivate with cinnamic acid or its derivates, or crotonic acid or its derivates, or acrylic or methacrylic acid; and a second monomer (B2) having an index of refraction lower than the inorganic fibers, the second monomer (B2) consisting of a triazinetrione derivate having at least one polymerizable substituted group. INDEPENDENT CLAIMS are:    (1) a resin obtained by the polymerization of a composition (B) comprising: a first monomer (B1) selected from: (i) esters of 9,9'-bis(4-hydroxyphenyl)fluorene or its ethoxylated derivate with cinnamic acid or its derivates or crotonic acid or its derivates; (ii) mixed esters of 9,9'-bis(4-hydroxyphenyl)fluorene or its ethoxylated derivate with cinnamic acid or its derivates and acrylic or methacrylic acid; (iii) mixed esters of 9,9'-bis(4-hydroxyphenyl)fluorene or its ethoxylated derivate with crotonic acid and acrylic or methacrylic acid; (iv) ethers of 9,9'-bis(4-hydroxyphenyl)fluorene or its ethoxylated derivate with allylic alcohol; and (v) monoesters of 9,9'-bis(4-hydroxyphenyl)fluorene monoallylether or its ethoxylated derivate with cinnamic acid or its derivates, or crotonic acid or its derivates, or acrylic or methacrylic acid; and a second monomer (B2) consisting of a triazinetrione derivate having at least one polymerizable substituted group; a composite film comprising a substrate (A) made of inorganic fibers impregnated by a resin, where the resin is obtained by polymerization of the composition (B), and where the composite film has an average transparency, in a range of wavelengths from 300 to 700 nm, higher than or equal to 80%; or a composite film comprising a substrate (A) made of inorganic fibers impregnated by a resin, where the resin is obtained by the polymerization of a composition (B), where the composite film has an onset glass transition temperature (Tg) higher than or equal to 250 degrees C; or a composite film comprising a substrate (A) made of inorganic fibers impregnated by a resin, where the resin is obtained by the polymerization of a composition (B), the composite film having a coefficient of linear thermal expansion lower than or equal to 20 ppm/ degrees C; and    (2) a cured resin having an average transparency, measured in the range from 400 to 700 nm, higher than or equal to 80% and an onset Tg higher than or equal to 280 degrees C.