Patent ID: 7338984

Claim:
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.