| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a photochromic composition which functions as an adhesive layer for bonding optical sheets made from a polycarbonate resin or the like, wherein a laminate using the composition exhibits excellent tight adhesion, heat resistance, and photochromic properties. <P>SOLUTION: The photochromic composition includes a polyurethane resin (component A) and a photochromic compound (component B). The polyurethane resin (component A) is obtained by the reaction of a polydiol compound (component A1) having two hydroxyl groups in the molecule and a molecular weight of 400-3,000, a diisocyanate compound (component A2) having two isocyanate groups in the molecule, a chain extender (component A3) having two functional groups that can react with the isocyanate group in the molecule and a molecular weight of 50-300, and a functionality-imparting compound (component A4) containing at least one or two groups that can react with the isocyanate group in the molecule and having, for example, a piperidine structure in the molecule. <P>COPYRIGHT: (C)2012,JPO&INPIT |
