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For applications to a protective layer of a glass surface against a HF penetration, composition of UV-curable pastes was optimized by adjusting both the mixing ratio of oligomers and the content of the cross-linker. By use of the optimized paste consisting of tetrahydrofurfuryl acrylate as an acrylate monomer, di(trimethylolpropane) tetraacrylate as an acrylate cross-linker, mixed oligomer of bisphenol A glycerolate diacrylate and aliphatic urethane diacrylate, and a photoinitiator, we could fabricate a cured film with a high acid resistance, a high surface hardness and a high impact strength. In addition, the swelling ratio, the cross-linking density, and the average molecular weight between cross-linking points in the cured films were quantified. From the swelling tests, we found that the use of solvents such as toluene, chloroform, ethyl acetate and cyclohexanone, in which the films become highly swelled, should be avoided.

Physical properties of ultraviolet-cured films for applications to a protective layer against acids and organic solvents