Resin composition containing ultrafine inorganic particle
By providing a composition in which refractive index can be controlled, and scratch resistivity and adhesion (especially adhesion to a resin having a thiourethane bond or epithiosulfide bond) are excellent when the composition is coated on a base material such as a resin and then cured, the composition comprises (a) a thio(meth)acrylate compound represented by the general formula (1) and (b) ultrafine inorganic particles: wherein a linking(or connecting) group R represents an aliphatic residue, an aromatic residue, an alicyclic residue or a heterocyclic residue or an aliphatic residue having an oxygen atom, a sulfur atom, an aromatic ring, an aliphatic ring, or a heterocycle in the chain; R m represents each independently a hydrogen atom or a methyl group; and n is an integer of 1 to 4.
1. A composition comprising (a) a thio(meth)acrylate compound represented by the formula (1), (b) ultrafine inorganic particles, (d) one or more hydroxyl group-containing (meth)acrylate compounds represented by the formulae (7) to (10), and (e) a β-diketone compound represented by the formula (11):
wherein a linking (or connecting) group R represents one of the formulae (2), (3), (5) and (6):
wherein, in formula (1), R m represents each independently a hydrogen atom or a methyl group; n is an integer of 2 to 4; R 1 is a hydrogen atom or a methyl group; R 2 represents a hydrogen atom, a methyl group or an ethyl group; X 1 and X 2 represent oxygen atoms or sulfur atoms; i is an integer of 1 to 5; j is an integer of 0 to 2; and k, x, y and z are each independently 0 or 1:
wherein, in formulae (7) to (10), R m represents a hydrogen atom or a methyl group; r and t are each an integer of 1 to 4; u is each independently an integer of 1 to 4; v is each independently an integer of 1 to 4; w is each independently an integer of 0 to 4:
wherein, formula (11), R 4 and R 5 represent hydrogen atoms or such ones that one is a hydrogen atom and another is a straight chain or branched C 1 to C 4 alkyl group; R 3 and R 6 represent hydrogen atoms or each independently a hydrogen atom, a C 1 to C 4 alkyl group, a hydroxyl group, an aliphatic residue, an aromatic residue, an alicyclic residue, a heterocyclic residue, or C 1 to C 6 alkyl group containing one or more ether groups, ester groups, thioester groups or ketone groups in the chain structure; or R 3 and R 5 may be combined together to form C 5 to C 10 rings which may be substituted with one or more C 2 to C 4 alkylene groups.
2. The composition according to claim 1 , further comprising (c) a (meth)acrylate compound having a (thio)urethane bond.
3. The composition according to claim 2 , wherein a layer of the composition having a thickness of 2 μm coated on the surface of a resin plate having a thiourethane bond or an epithiosulfide bond and then cured with ultraviolet rays has (1) an evaluation score of a cross-hatch, tape-peeling test (JIS-K5400) of 6 or more; and (2) a pencil scratch test value (JIS-K5400) of 3H or more.
4. A coating composition comprising the composition as described in claim 3 .
5. An optical material comprising the composition as described in claim 3 .
6. The composition according to claim 1 , wherein a layer of the composition having a thickness of 2 μm coated on the surface of a resin plate having a thiourethane bond or an epithiosulfide bond and then cured with ultraviolet rays has (1) an evaluation score of a cross-hatch, tape-peeling test (JIS-K5400) of 6 or more; and (2) a pencil scratch test value (JIS-K5400) of 3H or more.
7. A coating composition comprising the composition as described in claim 1 .
8. An optical material comprising the composition as described in claim 1 .