Process to mold a plastic optical article with integrated hard coating
View Patent ↗Disclosed is a process for molding plastic optical articles with a hard coated film, comprising steps of coating one side of an optical film with a hard coating, pre-curing the hard coating to a tack free state while still maintaining the coating flexibility, making an insert from the coated film for the desired optical article, molding the plastic resin onto the insert through insert injection molding, and post-curing the molded article. The utilization of the pre-curing and post-curing steps have been found to eliminate hard coating cracks during the insert making and the molding step, while providing a hard coating with desired properties. Such an optical article possesses a hard coating integrated on its surface, thus, eliminating the need to further coat the optical article.
1. A method of producing a molded optical lens comprising: applying a hard coating to one side of an optical film; precuring the hard coating; forming the optical film to a desired shape; placing the optical film in a mold cavity; injecting a resin material to form a lens base against the optical film; and curing the hard coating.
2. The method of producing a molded optical article of claim 1 , wherein the hard coating is thermally curable.
3. The method of producing a molded optical article of claim 1 , wherein the hard coating is UV curable or radiation curable.
4. The method of producing a molded optical article of claim 1 , wherein the hard coating is applied to the optical film with a web coating process.
5. The method of producing a molded optical article of claim 1 , wherein the hard coating is applied to the optical film by a spin coating process.
6. The method of producing a molded optical article of claim 1 , wherein the optical film is comprised of a material thermally fusible to the resin material.
7. The method of producing a molded optical article of claim 1 , wherein the resin material is selected from a group consisting of polycarbonates, (meth)acrylate resins, styrene-(meth)acrylate copolymers, polysulfones, polyarylates, cyclo-olefin copolymer resins, or cellulose esters.
8. The method of claim 7 , wherein the optical film is comprised of a material selected from a group consisting of polycarbonates, (meth)acrylate resins, styrene-(meth)acrylate copolymers, polysulfones, polyarylates, cyclo-olefin copolymer resins, or cellulose esters.
9. The method of producing a molded optical article of claim 1 , wherein the optical lens is an ophthalmic lens.
10. The method of producing a molded optical article of claim 1 , wherein the optical lens is a sport goggle lens.
11. The method of producing a molded optical article of claim 1 , wherein the optical film is a functional plate.
12. The method of claim 11 , wherein the optical film is thermally fusible to the optical article resin material.
13. The method of claim 12 , wherein the optical film is a polarizing plate.
14. The method of claim 13 , wherein the optical film is a photochromic plate.
15. An eye lens comprising: a lens substrate; an optical film joined with the lens substrate; and a hard coating disposed upon the optical film prior to the optical film being joined with the lens substrate, the hard coating having been pre-cured prior to said optical film being joined with said lens substrate.
16. An optical element formed by injection molding comprising: a lens substrate; an optical film disposed upon the lens substrate; and a hard coating disposed upon the optical film prior to the optical film being joined with the lens substrate, the hard coating having been pre-cured prior to disposing said optical film on said lens substrate; said hard coating being substantially free of wrinkles and cracks.
17. The eye lens of claim 15 wherein the hard coat has been thermally cured after the optical film was joined with the lens substrate.
18. The eye lens of claim 15 wherein the hard coating disposed on the optical film comprises components that can be cross-linked by both radiation energy and thermal energy.
19. The eye lens of claim 15 wherein the optical film comprises a thermoplastic resin material.
20. The eye lens of claim 19 wherein the material is selected from a group consisting of aromatic polyesters, polycarbonates, cyclo-olefin homopolymers and copolymers, polyacrylates, poolysulfones, polyarylates, coplymers of styrene and acrylic esters, or blends of thermoplastic resins such as polyester and polycarbonate.
21. The eye lens of claim 15 wherein the optical film is thermally fusible with the lens substrate.
22. The eye lens of claim 15 wherein the hard coating disposed upon the optical film comprises a thickness of 2 to 10 microns.
23. The eye lens of claim 22 wherein the hard coating disposed upon the optical film comprises a thickness of 3 to 6 microns.
24. The eye lens of claim 16 wherein the hard coating disposed on the optical film comprises components that can be cross-linked by both radiation energy and thermal energy.
25. The eye lens of claim 16 wherein the optical film comprises a thermoplastic resin material.
26. The eye lens of claim 25 wherein the material is selected from a group consisting of aromatic polyesters, polycarbonates, cyclo-olefin homopolymers and copolymers, polyacrylates, poolysulfones, polyarylates, coplymers of styrene and acrylic esters, or blends of thermoplastic resins such as polyester and polycarbonate.
27. The optical element of claim 16 wherein the optical film is thermally fusible with the lens substrate.
28. The optical element of claim 16 wherein the hard coating disposed upon the optical film comprises a thickness of 2 to 10 microns.
29. The optical element of claim 28 wherein the hard coating disposed upon the optical film comprises a thickness of 3 to 6 microns.