Photochromic polyurethane laminates and methods for the formation of same wherein a photochromic polyurethane layer of the laminate is interposed between two primer coated transparent resin sheets.

Provided is a compound which is fluidized by light irradiation and is less colored. The compound is a compound represented by the following general formula (1), which is fluidized by light irradiation:
R.sub.1CH?NR.sub.2General Formula (1) wherein R.sub.1 is a substituted or unsubstituted cyclic hydrocarbon group or a substituted or unsubstituted heterocyclic group; and R.sub.2 is a substituted or unsubstituted heterocyclic group containing a nitrogen atom bonded to the nitrogen atom in the general formula (1).

Provided is a composition including: an acrylamide compound (A1) having a molecular weight of 150 or greater but 250 or less; and a multifunctional polymerizable compound (A2), wherein a content of the multifunctional polymerizable compound (A2) is 15% by mass or greater but 35% by mass or less.

Provided is a composition including: an acrylamide compound (A1) having a molecular weight of 150 or greater but 250 or less; and a multifunctional polymerizable compound (A2), wherein a content of the multifunctional polymerizable compound (A2) is 15% by mass or greater but 35% by mass or less.

Photoswitchable photoinitiators comprising a spironaphthoxazine molecule including one or more substituents wherein at least one substituent comprises a substituted or unsubstituted diaryl ketone moiety are disclosed. Photohardenable compositions and methods for forming an object in a volume and products thereof, which photohardenable compositions and methods include such photoswitchable photoinitiator, are also disclosed.

Photoswitchable photoinitiators comprising a spironaphthoxazine molecule including one or more substituents wherein at least one substituent comprises a substituted or unsubstituted diaryl ketone moiety are disclosed. Photohardenable compositions and methods for forming an object in a volume and products thereof, which photohardenable compositions and methods include such photoswitchable photoinitiator, are also disclosed.

A method of preparing a photochromic optical article is provided, which includes: (i) applying a first organic solvent to a surface of an optical substrate, thereby forming an organic solvent wetted surface on the optical substrate; and (ii) applying a curable photochromic coating composition over the organic solvent wetted surface of said optical substrate, thereby forming a curable photochromic coating layer over the surface of the optical substrate. The curable photochromic coating composition includes a second organic solvent, and the first and second organic solvents are miscible with each other. With some embodiments, the first and second organic solvents are the same.

A method of preparing a photochromic optical article is provided, which includes: (i) applying a first organic solvent to a surface of an optical substrate, thereby forming an organic solvent wetted surface on the optical substrate; and (ii) applying a curable photochromic coating composition over the organic solvent wetted surface of said optical substrate, thereby forming a curable photochromic coating layer over the surface of the optical substrate. The curable photochromic coating composition includes a second organic solvent, and the first and second organic solvents are miscible with each other. With some embodiments, the first and second organic solvents are the same.

Various non-limiting embodiments of the present disclosure relate to ophthalmic devices comprising photochromic materials comprising a reactive substituent. For example, the present disclosure contemplates ophthalmic devices comprising photochromic materials, such as photochromic naphthopyrans and indeno-fused naphthopyrans having a reactive substituent comprising a reactive moiety linked to the photochromic naphthopyran by one or more linking groups. In certain non-limiting embodiments, the reactive moiety comprises a polymerizable moiety. In other non-limiting embodiments, the reactive moiety comprises a nucleophilic moiety. Other non-limiting embodiments of the present disclosure relate to methods of making the photochromic ophthalmic device, wherein the photochromic ophthalmic devices comprise the photochromic naphthopyrans described herein.

Various non-limiting embodiments of the present disclosure relate to ophthalmic devices comprising photochromic materials comprising a reactive substituent. For example, the present disclosure contemplates ophthalmic devices comprising photochromic materials, such as photochromic naphthopyrans and indeno-fused naphthopyrans having a reactive substituent comprising a reactive moiety linked to the photochromic naphthopyran by one or more linking groups. In certain non-limiting embodiments, the reactive moiety comprises a polymerizable moiety. In other non-limiting embodiments, the reactive moiety comprises a nucleophilic moiety. Other non-limiting embodiments of the present disclosure relate to methods of making the photochromic ophthalmic device, wherein the photochromic ophthalmic devices comprise the photochromic naphthopyrans described herein.