Laminated transparent plastic material and polymerizable monomer

摘要

A laminated transparent plastic material comprises a transparent resin material having a total visible light transmittance of at least 85 % and a high hardness transparent resin layer of at least 0.2 mm thick having a pencil hardness of at least 4H, Rockwell M scale hardness of at least 100, and a total visible light transmittance of at least 85 % overlying the surface of the transparent resin material, the laminated transparent plastic material having a bending modulus of elasticity of at least 350 kgf/mm<2>. A polymerizable monomer has the formula, where R5 and R6 are similar or dissimilar and are selected from group consisting of hydrogen and methyl, k is an integer of 2 - 10, and the isopropenyl substituent on the aromatic ring is in the p-position or m-position.