Tinted polycarbonate ophthalmic lens product and method of manufacture
The present invention describes ophthalmic lens products comprising a multilayer wafer and an injection-molded polycarbonate inner portion. The multilayer wafer includes a dyed, photochromic or polarized layer between a tinted inner layer and an outer polymeric layer. The inner layer may be solid or gradient-tinted. The polycarbonate inner portion of the lens product is directly fused to the tinted inner layer of the multilayer wafer during injection molding. The invention further describes a method to produce a gradient-tinted polarized polycarbonate eyewear lens product by obtaining a multilayer wafer having an outer layer, an inner polycarbonate layer, and a polarized layer between the inner and outer layers, applying a gradient tint to the wafer's inner layer, placing the gradient tinted wafer within an injection-molding cavity, and injecting molten polycarbonate directly against the wafer's gradient-tinted layer to form the inner portion of the lens product and to fuse it to the wafer.
1. A tinted, polarized eyewear lens product comprising:
a) a multilayer wafer comprising an outer transparent polymeric layer, an inner transparent polymeric layer, and a polarized layer positioned between the inner and the outer polymeric layers, wherein of said inner and outer transparent polymeric layers, only the inner transparent polymeric layer is tinted; and
b) an injection-molded polycarbonate inner portion directly fused to the inner, tinted transparent polymeric layer of the multilayer wafer.
2. The tinted, polarized eyewear lens product as defined in claim 1 , wherein the inner transparent polymeric layer is tinted with a gradient tint.
3. The tinted, polarized eyewear lens product as defined in claim 2 , wherein:
the gradient tint is darkest at the top of the lens product when viewed in an as-worn position; and
the polarized layer comprises a linear polarizer with its absorption axis aligned along the horizontal axis of the tinted, polarized eyewear lens product.
4. The tinted, polarized eyewear lens product as defined in claim 2 , wherein the multilayer wafer further comprises a photochromic material.
5. The tinted, polarized eyewear lens product as defined in claim 1 , wherein the multilayer wafer further comprises additives selected from the group consisting of dyes, tints, UV absorbers, UV reflectors, UV stabilizers, thermal stabilizers, IR reflectors, visible light filters, selective light reflectors, and selective light absorbers.
6. The tinted, polarized eyewear lens product as defined in claim 5 , wherein the polarized layer further comprises a photochromic material.
7. The tinted, polarized eyewear lens product as defined in claim 1 , wherein the inner transparent polymeric layer comprises polycarbonate.
8. The tinted, polarized eyewear lens product as defined in claim 1 , wherein the multilayer wafer further comprises a photochromic material.
9. The tinted, polarized eyewear lens product as defined in claim 1 , wherein the multilayer wafer comprises a circular polarizer.
10. The tinted, polarized eyewear lens product as defined in claim 1 , further comprising a coating selected from the group consisting of hard coatings, anti-reflective coatings, photochromic coatings, and light-filtering coatings.
11. A gradient-tinted, dyed eyewear lens product comprising:
a) a multilayer wafer comprising an outer transparent polymeric layer, an inner transparent polymeric layer, and a dyed layer positioned between the inner and the outer polymeric layers, wherein the inner transparent polymeric layer has is the only layer with a gradient tint; and
b) an injection-molded polycarbonate inner portion directly fused to the inner transparent polymeric layer of the multilayer wafer.
12. The gradient-tinted, dyed eyewear lens product as defined in claim 11 , wherein the dyed layer comprises a photochromic material.
13. The gradient-tinted, dyed eyewear lens product as defined in claim 11 , wherein the dyed layer comprises constant tints.
14. The gradient-tinted, dyed eyewear lens product as defined in claim 11 , wherein the inner transparent polymeric layer comprises polycarbonate.
15. The gradient-tinted, dyed eyewear lens product as defined in claim 11 , wherein the multilayer wafer further comprises a photochromic material.
16. A method of making a gradient-tinted polarized eyewear lens product comprising the steps of:
a) obtaining a multilayer wafer comprised of at least one outer transparent polymeric layer, an inner transparent polycarbonate layer, and a polarized layer positioned between the inner and outer transparent layers;
b) applying a gradient tint only to an inner surface of the inner transparent polycarbonate layer to create a gradient-tinted surface;
c) placing the multilayer wafer against a cooled mold surface of an injection-molding cavity such that the gradient-tinted surface is located on the side opposite the mold surface; and
d) injecting molten polycarbonate directly against the gradient-tinted surface of the wafer to form an inner portion of the lens product, wherein the injection-molded polycarbonate fuses to the inner transparent polycarbonate layer of the wafer.
17. The method of making a gradient-tinted polarized eyewear lens product as defined in claim 16 , wherein the multilayer wafer further comprises a photochromic material.
18. The method of making a gradient-tinted polarized eyewear lens product as defined in claim 16 , wherein the multilayer wafer further comprises at least one additive selected from the group consisting of dyes, tints, UV absorbers, UV reflectors, UV stabilizers, thermal stabilizers, IR reflectors, visible light filters, selective light reflectors, and selective light absorbers.
19. The method of making a gradient-tinted polarized eyewear lens product as defined in claim 16 , wherein the method further comprises a step of applying one or more coatings selected from the group consisting of hard coatings, anti-reflective coatings, photochromic coatings, and light-filtering coatings.
20. The method of making a gradient-tinted polarized eyewear lens product as defined in claim 16 , wherein the multilayer wafer comprises a circular polarizer.