Composition for optical material, optical material and lenses
Disclosed are optical materials which effectively absorb UV light up to the long wavelength band, have low specific gravity, and have balanced properties including impact and heat resistances; lenses; and optical material compositions as their starting materials. The composition contains a polymerizable monomer material consisting of at least one di(meth)acrylate of formula (1): (R: CH 3 etc., Ph: a phenylene group; x, z: an integer of 1 to 5; y: 0 or 1) and at least one monomer (M) having at least one vinyl group in one molecule other than monomers of formula (1), and an additive selected from component (A 1 ), (A 2 ), or (B), or mixtures thereof, provided that components (A 1 ) and/or (B) is contained, and when component (B) is contained, components (A 1 ) and/or (A 2 ) is also contained: (A 1 ): a chlorinated benzotriazole UV absorber; (A 2 ): a chlorine-free benzotriazole UV absorber; (B): a coloring agent having absorption maximum in 520-650 nm.
1. An optical material composition comprising:
a polymerizable monomer material consisting of
(a) 30 to 98 wt % of at least one dimethacrylate of formula (1) wherein R is a methyl group, Ph is a phenylene group, x and z are the same or different and each denotes an integer of 2 to 5 and y is 0;
and
(b) 2 to 70 wt % of at least one monomer (M) having at least one vinyl group in one molecule thereof; wherein the at least one monomer (M) is not a di(meth)acrylate having the formula:
wherein R is a hydrogen atom or a methyl group, Ph is a phenylene group, x and z are the same or different and each denotes an integer of 1 to 5, and y is 0 or 1; and
an additive consisting of 500 to 5000 ppm of a chlorinated benzotriazole UV absorber (A 1 ) and a coloring agent (B) having its absorption maximum in the range of 520 to 650 nm,
wherein a yellow value (b*) of said composition in the L*a*b* color specification system is not more than 1.0 when an optical path length is 2 mm.
2. The composition of claim 1 , wherein said component (B) is selected from the group consisting of an anthraquinone dye, a naphthol dye, a monoazo dye, a disazo dye, a triallymethane dye, ultramarine blue, cobalt blue, phtharocyanine blue, and mixtures thereof.
3. The composition of claim 1 further comprising a nonionic surface active agent.
4. A plastic optical material obtained by curing a composition of claim 1 in the presence of a radical polymerization initiator.
5. The optical material of claim 4 , wherein a yellow value (b*) of said optical material in the L*a*b* color specification system is not more than 1.0.
6. A lens comprising an optical material of claim 4 .
7. The lens of claim 6 , further comprising a hard coating layer on it surface.
8. An optical material composition comprising:
a polymerizable monomer material consisting of
at least one monomer (M) having at least one vinyl group in one molecule whereof other than di(meth)acrylates of formula (1) wherein R is a hydrogen atom or a methyl group, Ph is phenylene group, x and z are the same or different and each denotes an integer of 1 to 5 and y 0 or 1;
at least one dimethacrylate of formula (1) wherein R is a methyl group, Ph is a phenylene group, x and z are the same or different and each denotes on integer of 2 to 5, and y is 0; and
at least one di(meth)acrylate of formula (1) wherein R is a hydrogen atom or a methyl group, Ph is a phenylene group, x and z are the same or different and each denotes an integer of 1 to 5, and y is 0 or 1, and excluding said dimethacrylates of formula (1);
and
an additive consisting of 500 to 5000 ppm of a chlorinated benzotriazole UV absorber (A 1 ), and a coloring agent (B) having its absorption maximum in the range of 520 to 650 nm,
wherein said at least one dimethacrylate of formula (1) is in an amount of30 to 98 wt % of said polymerizable monomer material, and
wherein a yellow value (b*) of said composition in the L*a*b* color specification system is not more than 1.0 when an optical path length is 2 mm.
9. The composition of claim 8 , wherein said component (B) is selected from the group consisting of an anthraquinone dye, a naphthol dye, a monoazo dye, a disazo dye, a triallymethane dye, ultramarine blue, cobalt blue, phtharocyanine blue, and mixtures thereof.
10. The composition of claim 8 further comprising a nonionic surface active agent.
11. A plastic optical material obtained by curing a composition of claim 8 in the presence of a radical polymerization initiator.
12. The optical material of claim 11 , wherein a yellow value (b*) of said optical material in the L*a*b* color specification system is not more that 1.0.
13. A lens comprising an optical material of claim 11 .
14. The lens of claim 13 , further comprising a hard coating layer on its surface.