| abstract |
Multiple photochromic material is provided, and this material does not contain polymerisable unsaturated group substantially and comprises: a) indeno [2 ', 3 ': 3,4] naphtho-[1,2-b] pyrans; And b) is connected electrophilic nonconjugated group on the 11-position of indeno [2 ', 3 ': 3,4] naphtho-[1,2-b] pyrans.Optionally embodiment is included in other locational multiple substituting groups of indeno [2 ', 3 ': 3,4] naphtho-[1,2-b] pyrans.Photochromic article also is provided, and it comprises the wherein a kind of of base material and the above photochromic material that contacts with at least a portion of base material. |