TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The composition (B) further comprises a filler (C) made of functionalized inorganic particles, where the nominal size of the particles is smaller than 0.001 mm in diameter. Inorganic fibers are selected from glass fibers and/or ceramic fibers. The first monomer (B1) is represented by (B1-i) or (B1-ii).R1-R4=equal or different, each independently is a hydrogen atom or an alkyl group having 1 to 3 carbons;i and j=integer numbers, from 0 to 4, whose sum is equal to or lower than 4;R5-R8=equal or different, each independently is a hydrogen atom; a halogen atom; an alkyl group with 1 to 6 carbons; a cycloalkyl group with 3 to 6 carbons; an alkoxy group with 1 to 6 carbons; an aryloxy group with 6 to 12 carbons; a haloalkyl group -CnYzH(2n+1-z); a carbonyl group -COR, an ester group -OCOR or -COOR where is an alkyl group having 1 to 6 carbons;Y=selected from fluorine, chlorine, bromine and iodine;n=an integer from 1 to 12;z=an integer from 1 to (2n+1);p, q, r, s=integer numbers from 0 to 4 in formula (B1-i); p, q, are integer numbers from 0 to 4 and r, s are integer numbers from 0 to 3 in formula (B1-ii);X=a divalent radical selected from O, S, or a -CR10R11 alkylidene group;R10 and R11=equal or different, each independently is a hydrogen atom or an alkyl group having 1 to 3 carbons; andP1 and P2=equal or different, each independently is a polymerizable group comprising a double bond selected from formula (GP1), (GP2), (GP3), and (GP4).asterisk=represents the carbon bound to the oxygen;Y1 and Y2=equal or different, each independently is a hydrogen atom or an alkyl group having 1 to 3 carbons;Z1=a hydrogen atom; a halogen atom; an alkyl group having 1 to 6 carbons; a cydoalkyl group having 3 to 6 carbons; an alkoxy group having 1 to 6 carbons; an aryloxy group having 6 to 12 carbons; a halolkyl group -CnYzH(2n+1-z) where Y is selected from fluorine, chlorine, bromine and iodine, n is an integer from 1 to 12 and z is an integer from 1 to (2n+1); a carbonyl group -COR, an ester group -OCOR or -COOR, where R is an alkyl group having 1 to 6 carbons; and m is an integer from 0 to 5; andR9=a hydrogen atom or a methyl group; with the proviso that at least one of P1 and P2 is different than GP4 group.Alternatively, the first monomer (B1) is represented by generic formulae (I-XII).Y1-Y4=equal or different, each independently is a hydrogen atom or an alkyl group having 1 to 3 carbons; andZ1 and Z2=equal or different, each independently is a hydrogen atom; a halogen atom; an alkyl group having 1 to 6 carbons; a cycloalkyl group having 3 to 6 carbons; an alkoxy group having 1 to 6 carbons; an aryloxy group having 6 to 12 carbons; a haloalkyl group -CnYzH(2n+1-z) where Y is selected from fluorine, chlorine, bromine and iodine, n is an integer from 1 to 12 and z is an integer from 1 to (2n+1); a carbonyl group -COR, an ester group -OCOR or -COOR, where R is an alkyl group having 1 to 6 carbons; and m is an integer from 0 to 5.The monomer (B2) is represented generic formula (XIII).P3-P5=equal or different, are polymerizable groups comprising a double bond or non-polymerizable groups, with the proviso that at least one of P3, P4, and P5 is a polymerizable group comprising a double bond.The non-polymerizable group is selected from an alkyl group having 1 to 6 carbons; a cycloalkyl group having 3 to 6 carbons; a cycloalkyl group -CnYzH(2n+1-z) where Y is fluorine, chlorine, bromine or iodine, n is an integer from 1 to 12, and z is an integer from 1 to (2n+1); an alkyl group having 1 to 6 carbons substituted by a nitrile group (-CN), carbonyl (-COR), or ester (-OCOR or -COOR where R is an alkyl group having 1 to 6 carbons); a polyalkylenoxy group -((CH2)w-O)x-H, where w and x, are independently integer numbers from 1 to 3. Polymerizable group is selected from allyl group, allylether group, vinylether group or its derivate, ester of the cinnamic acid or its derivate, ester of the crotonic acid or its derivate, ester of the 3-alkoxy-propanoic acid or its derivate. Composition (B) comprises a reactive thinner, where reactive thinner is selected from acrylates and methacrylates having viscosity lower than 1 Pa-second. Functionalized inorganic particles are made of silica, alumina and its mixtures. Preferred Condition: The resin has an onset Tg higher than or equal to 250 degrees C. The average transparency of the resin, in a range of wavelengths from 300 to 700 nm, is higher than or equal to 80%. The resin has a peak of Tan Delta curve at a temperature higher than or equal to 325 degrees C. EXAMPLE - No suitable example given.