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 article comprising:
applying a primer layer to one side of an optical film;
applying a continuous and uniform layer of hard coating to the primer layer;
precuring the hard coating;
after the step of precuring, forming the optical film to a desired shape;
after the step of forming the optical article to a desired shape, placing the optical article in a mold cavity and injection molding a resin material into the mold cavity adjacent 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 primer layer 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 primer layer by a spin coating process.
6. The method of producing a molded optical article of claim 1 , wherein the primer forms a layer between about 0.1 microns to about 1.0 microns in thickness.
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 dam 1 , wherein the optical article is an ophthalmic lens.
10. The method of producing a molded optical article of dam 1 , wherein the optical article is a sport goggle plate.
11. The method of producing a molded optical article of claim 1 , wherein the optical film is a functional plate.
12. The method of dam 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. The optical element of claim 1 , wherein the optical film includes a functionality selected from a group of anti-reflection, polarization and photochromic properties.