Photochromic polyurethane laminate
AssigneeInsight Equity A.P.X., L.P.
InventorsXuzhi Qin, Hideyo Sugimura, Michael S. Boulineau
Life of this patent
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Abstract
A photochromic polyurethane laminate that is constructed to solve certain manufacturing difficulties involved in the production of plastic photochromic lenses is disclosed. The photochromic laminate includes at least two layers of a resinous material and a photochromic polyurethane layer that is interspersed between the two resinous layers and which contains photochromic compounds. The polyurethane layer is formed by curing a mixture of a solid thermoplastic polyurethane, at least one isocyanate prepolymer, at least one photochromic compound, and a stabilizing system.
Claims20
A photochromic polyurethane laminate for use in an optical article comprising:
- a first resin sheet;
- a second resin sheet;
- and
- a photochromic polyurethane layer having a top side attached to said first resin sheet and a bottom side attached to said second resin sheet, said photochromic polyurethane layer prepare from a composition comprising:
- a solid thermoplastic polyurethane prepared from a composition comprising at least one diisocyanate selected from a group consisting of:
- aliphatic diisocyanate and cycloaliphatic diisocyanate;
- at least one isocyanate-terminated polyurethane prepolymer;
- and
- at least one photochromic compound;
- wherein said photochromic polyurethane laminate has a molecular structure resulting from curing said laminate within a temperature range from about 50 degrees Celsius to about 130 degrees Celsius.
A photochromic polyurethane layer for use in an optical laminate prepared from a mixture comprising:
- a solid thermoplastic polyurethane prepared from a composition comprising at least one diisocyanate selected from a group consisting of:
- aliphatic diisocyanate and cycloaliphatic diisocyanate;
- at least one isocyanate-terminated polyurethane prepolymer;
- and
- at least one photochromic compound.
Dependencies are inferred from the claim text.