| 摘要 |
<p>The present invention provides a composition for an ultraviolet absorbent substance, which can keep excellent light resistance for a long period and can satisfactorily block UV-A which has been difficult to block heretofore while maintaining the transmittance of visible light at a high level; and an ultraviolet absorbent substance comprising the composition. More specifically, the invention provides a composition for an ultraviolet absorbent substance which comprises at least one metal complex represented by formula (1) and at least one matrix material and/or polymerizable monomer as a precursor of a matrix material, and an ultraviolet absorbent substance comprising the composition:
wherein Y 1 , Y 2 , Y 3 and Y 4 are each, independently of one another, NH, NR 5 , an oxygen atom or a sulfur atom, and R 5 of NR 5 assigned to Y 1 , Y 2 , Y 3 or Y 4 is an alkyl group having 1 to 8 carbon atoms or an aryl group having 6 to 15 carbon atoms, which may have substituent(s). Each of R 1 , R 2 , R 3 and R 4 is absent or, if present, one to four of 4 hydrogen atoms bound to 4 carbon atoms other than 2 carbon atoms shared with a five-membered ring among 6 carbon atoms of one benzene ring can be substituted, and all of substituents substituting for hydrogen atom(s) of the four benzene rings are each, independently of one another, an alkyl group having 1 to 8 carbon atoms, which may have substituent(s), a hydroxyl group, a carboxyl group, an alkoxy group having 1 to 4 carbon atoms, a halogeno group, an alkylaminosulfonyl group having 1 to 8 carbon atoms, which may have substituent(s), a morpholinosulfonyl group which may have substituent(s), and the like, and M represents a metal atom.</p> |
