Photochromic polyurethane laminate
AssigneeHOYA Optical Labs of America, Inc.
InventorsXuzhi Qin, Hideyo Sugimura, Michael Boulineau
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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.
Claims17
A photochromic polyurethane layer prepared from a mixture comprising a polyurethane, an isocyanate-terminated polyurethane prepolymer, and a photochromic compound;
- the polyurethane having a number average molecular weight from 9,000 to 100,000 and prepared from a composition comprising:
- an aliphatic diisocyanate comprising 4,4′-dicyclohexylmethanediiso-cyanate;
- a polyester polyol;
- and
- a chain extender;
- the isocyanate-terminated polyurethane prepolymer prepared from a composition comprising:
- an aliphatic diisocyanate comprising 4,4′-dicyclohexylmethanediiso-cyanate;
- and
- a polyester polyol;
- wherein a mixing ratio of the polyurethane and the isocyanate-terminated polyurethane prepolymer by weight is in a range from 1:9 to 9:1 and said polyurethane comprises terminal hydroxyl groups, urethane groups and urea groups having active hydrogen atoms to react with said isocyanate-terminated polyurethane prepolymer after lamination to provide further curability of said photochromic polyurethane layer.
A photochromic laminate for use in eyeglasses comprising:
- a first resin sheet;
- a second resin sheet;
- a photochromic polyurethane film having a first side bonded to the first resin sheet and a second side bonded to the second resin sheet;
- the photochromic polyurethane film prepared from a composition comprising:
- a polyurethane having a number average molecular weight from 9,000 to 100,000 and prepared from a composition comprising:
- an aliphatic diisocyanate comprising 4,4′-dicyclohexylmethane-diisocyanate;
- a polyester polyol;
- and
- a chain extender;
- an isocyanate-terminated polyurethane prepolymer prepared from a composition comprising:
- an aliphatic diisocyanate comprising 4,4′-dicyclohexylmethanediiso-cyanate;
- and
- a polyester polyol;
- and
- a photochromic compound;
- wherein a mixing ratio of the polyurethane and the isocyanate-terminated polyurethane prepolymer by weight is in a range from 1:9 to 9:1 and said polyurethane comprises terminal hydroxyl groups, urethane groups, and urea groups having active hydrogen atoms to react with said polyurethane prepolymer after lamination to provide further curability of said photochromic polyurethane film between the first resin sheet and the second resin sheet.
Dependencies are inferred from the claim text.