Photochromic material

A block or random copolymer of a photochromic molecule represented by the following general formula (IV):

• wherein, in the structural formula, A is a photochromic molecule having the above-mentioned structure, R1, R1-2 and R1-3 are each independently hydrogen or a methyl group, R3 to R7 are each independently hydrogen or an alkoxy group, and n is an integer of 2 to 20.

A block or random copolymer of a photochromic molecule represented by the following general formula (V):

• wherein, in the structural formula, A is a photochromic molecule having the above-mentioned structure, B is a photosensitizing compound having the above-mentioned structure, R1, R1-2, R1-3 and R1-4 are each independently hydrogen or a methyl group, R3 to R8 are each independently hydrogen or an alkoxy group, m is an integer of 2 to 20, and n is an integer of 2 to 20.

A block or random copolymer of a photochromic molecule represented by the following general formula (VI):

• wherein, in the structural formula, A is a photochromic molecule having the above-mentioned structure, B is a photosensitizing compound having the above-mentioned structure, R1 and R1-2 are each independently hydrogen or a methyl group, R3 to R8 are each independently hydrogen or an alkoxy group, m is an integer of 2 to 20, and n is an integer of 2 to 20.

A block or random copolymer of a photochromic molecule represented by the following general formula (VII):

• wherein, in the structural formula, A and A2 are photochromic molecules having the above-mentioned structures, R1 and R1-2 are each independently hydrogen or a methyl group, R3 and R9 are each independently hydrogen or an alkoxy group, R4 to R7 are hydrogens, R10 to R13 are alkoxy groups, m is an integer of 2 to 20, and n is an integer of 2 to 20.