TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - The HDP is acrylic or methacrylic ester or amide or urethane, homopolymer, copolymer including random, alternate, block copolymer, and terpolymer including random, alternate and block terpolymers (preferably acrylic or methacrylic acid esters, amides, urethanes or ethers are selected from butyl acrylate, octyl acrylate, decyl acrylate, iso-decyl acrylate, tridecyl acrylate, ethyl hexyl acrylate, ethoxylated ethyl hexyl acrylate, octyl decyl acrylate, di-ethylene glycol 2-ethylhexyl ether acrylate, tetra decyl acrylate, cetyl acrylate, stearyl acrylate, behenyl acrylate, polyethylene glycol mono acrylate, acrylamide, urethane acrylate and caprolactone acrylate or any methacrylate derivative). The unsaturated monomer or oligomer is aliphatic or cycloaliphatic or heterocyclic monomer or oligomer; or is selected amongst aliphatic, heterocyclic and cycloaliphatic monomers and oligomers having each at least one side group is different from aryl and conjugated double bonds. The each of the unsaturated monomer or oligomer has at least one reactive group per molecule, the reactive group is selected from acryl, methacryl, fumaryl, vinyl, allyl and unsaturated polyester. The unsaturated monomer is a long chain alkyl acrylate or methacrylate ester selected from butyl acrylate, octyl acrylate, decyl acrylate, iso-decyl acrylate, tridecyl acrylate, ethyl hexyl acrylate, ethoxylated ethyl hexyl acrylate, octyl decyl acrylate, di-ethylene glycol 2-ethylhexyl ether acrylate, tetra decyl acrylate, cetyl acrylate, stearyl acrylate, behenyl acrylate, polyethylene glycol mono acrylate, acrylamide and caprolactone acrylate, or any methacrylate derivative. The unsaturated oligomer is selected from urethane acrylate, polyester acrylate and aliphatic unsaturated polyester or any methacrylate derivative. The photoinitiator is selected so as to be able to initiate polymerization and cross-linking when exposed to UV and/or visible light. The photoinitiator is selected from 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 2,4,6-trimethylbenzoyl-diphenyl-phosphineoxide, 1-hydroxy-cyclohexyl-phenyl-ketone, bis(2,6-dimethoxy benzoyl)-2,4,4-trimethyl-pentylphosphine oxide, 1-(4-(2-hydroxyethoxy)-phenyl)-2-hydroxy-2-methyl-1-propane-1-one, 2,2-dimethoxy-1,2-diphenylethan-1-one, and 2-methyl-1(4-(methylthio)phenyl)-2-morpholinopropan-1-one.