Laminated transparent plastic material and polymerizable monomer
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United States of America Patent
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Feb 28, 1995
Grant Date -
N/A
app pub date -
Jan 8, 1993
filing date -
Jan 13, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.sup.2. A polymerizable monomer has the formula, ##STR1## where R.sub.5 and R.sub.6 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.
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