Patent ID: 6802993
Filing Date: 2004-10-12
Classification: C08F,G02B

Abstract:
A curable composition comprising:(A) a polyfunctional radically polymerizable monomer having at least three polymerizable groups in the molecule wherein said polyfunctional radically polymerizable monomer is represented by the following formula (2) or (2â€²): â€ƒwherein R4 and R5 are each independently a hydrogen atom, methyl group or ethyl group, R6 is a tervalent to hexavalent organic group, d, dâ€² and dâ€³ are each independently an integer of 0 to 3, and e and eâ€² are each independently an integer of 3 to 6, and optionally an additional polyfunctional radically polymerizable monomer having at least three polymerizable groups in the molecule; (B) a radically polymerizable monomer having a silanol group or a group capable of forming a silanol group by hydrolysis; (C) another radically polymerizable monomer different from the above components (A) and (B); and (D) a photochromic compound, wherein â€ƒsaid components (A), (B), and (C) are contained in amounts of 1 to 50 wt %, 0.5 to 20 wt % and 30 to 98.5 wt % based on the total of the components (A), (B), and (C), respectively, and said component (D) is contained in an amount of 0.0001 to 10 parts by weight based on 100 parts by weight of the total of said components (A), (B), and (C).