Patent ID: 11866648
Assignee: MITSUI CHEMICALS, INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  G | IPC C  G

Claim 12:
13. A process for producing a polymerizable composition for optical materials, comprising:
a step A of mixing together a polyisocyanate compound (i), a polymer (ii) represented by General Formula (ii), a photochromic compound (iii), and an internal release agent (iv);
a step B of mixing a mixed solution obtained by the step A with a polythiol compound (v); and
a step C of further mixing a mixed solution obtained by the step B with a polymerization catalyst (vi) so as to obtain a polymerizable composition for optical materials, wherein the polyisocyanate compound (i) contains at least one selected from the group consisting of an aliphatic polyisocyanate compound, an aromatic polyisocyanate compound, and a heterocyclic polyisocyanate compound, wherein in the step A, the internal release agent (iv) is added so that a content of the internal release agent (iv) in the polymerizable composition for optical materials is 500 to 1,000 ppm, and in the step C, the polymerization catalyst (vi) is added so that a content of the polymerization catalyst (vi) in the polymerizable composition for optical materials is 120 to 400 ppm,

R1A1—R2—A2—R3]n  (ii), wherein, in General Formula (ii), A1 and A2 represent different polymer chains, R1 is an n-valent organic group, R2 is a linking group that links two kinds of polymer chains, R3 is an organic group, and n is an integer of 1 to 6.