Patent ID: 8409670
Filing Date: 2013-04-02
Classification: G02B,Y10T

Abstract:
1. A method of producing a laminate comprising a substrate having curved surfaces and a photochromic film thereon, said film having a thickness of 20 to 50 μm and containing a photochromic compound in a concentration of 2 to 7% by weight, the method comprising the steps of: preparing the substrate; applying a photocurable composition having a viscosity (25° C.) of 60 to 200 cp and containing a photopolymerizable monomer, the photochromic compound and a phosphorus-containing photopolymerization initiator onto the curved surfaces of said substrate by a spin-coating method; and curing said photocurable composition to form the photochromic film by irradiation with an active energy ray having a relative intensity profile of 25 to 50% of wavelength components of not shorter than 400 nm but not longer than 500 nm, 50 to 75% of wavelength components of not shorter than 300 nm but shorter than 400 nm, and 0 to 5% of wavelength components of not shorter than 200 nm but shorter than 300 nm while maintaining said substrate at a temperature not higher than 80° C., wherein an intensity of the active energy ray falling on the substrate is not larger than 30 mW/cm