Polarizing plate and eyewear plastic article containing the same
A polarizing plate is formed with a non-polyvinyl alcohol based polarizing film, a thermoplastic support layer bonded to one surface of the polarizing thin layer, and a thermoplastic protective layer bonded to the other surface of the polarizing thin layer. The thermoplastic support layer is constructed from the same or similar material as the eyewear plastic article base. The thermoplastic protective layer is constructed from a resin sheet that is non-birefringent or highly birefringent. The polarizing plate can be advantageously used in eyewear articles such as sunglasses and goggles for glare reduction. The polarizing plate can be more advantageously used for the production of eyewear optical articles through an insert injection molding technique due to its high heat stability and moisture resistance.
1 . A polarizing plate comprising a light polarizing film bonded on one side with a thermoplastic support layer, and on another side with a thermoplastic protective layer; said light polarizing film being a material selected from the group consisting of polyacetylene, aromatic polyester homo-polymer with dichroic dye, aromatic polyester copolymer with dichroic dye, blend of aromatic polyester homo-polymer and aromatic polyester copolymer with dichroic dye, aromatic liquid crystal polymer incorporated with dichroic dyes, oriented dichroic dye crystalline,_and wherein said thermoplastic support layer and thermoplastic protective layer each have a thickness within a range from about 0.02 mm to about 1.3 mm.
2 . The polarizing plate of claim 1 wherein the thermoplastic protective layer has a retardation value of higher than 2,000 nm.
3 . The polarizing plate of claim 1 wherein the thermoplastic protective layer has a retardation value of less than 200 nm and a stress-optic coefficient of less than 30×10−6 mm2/N.
4 . The polarizing plate of claim 1 wherein the thermoplastic support layer and the thermoplastic protective layer are made from the same type of resin material.
5 . The polarizing plate of claim 2 wherein the thermoplastic protective layer comprises a thermoplastic sheet of resin material selected from the group consisting of a polycarbonate, a polysulfone, a polyarylate, a ester of (meth)acrylic acid, and an aromatic polyester.
6 . The polarizing plate of claim 3 wherein the thermoplastic protective layer is constructed from a thermoplastic sheet of resin material selected from the group consisting of a cellulose ester, a ester of (meth)acrylic acid, a copolymer of cyclic olefin, and a polystyrene.
7 . The polarizing plate of claim 1 , wherein said support layer is a polycarbonate sheet; and wherein said protective layer is a sheet of oriented resin material selected from the group consisting of a polycarbonate, a polysulfone, an ester of (meth)acrylic acid, and an aromatic polyester.
8 . The polarizing plate of claim 1 , wherein said support layer is colored for the purpose of modifying color and reducing light transmission of said polarizing plate.
9 . A polarized optical eyewear article made by injection molding polycarbonate material onto the polycarbonate support layer of the light polarizing plate as set forth in claim 1 .
10 . A laminate polarizing film comprising:
a thermoplastic protective layer;
a light polarizing layer;
a thermoplastic support layer;
wherein said light polarizing layer comprises a material selected from the group consisting of polyacetylene, aromatic polyester homo-polymer with dichroic dye, aromatic polyester copolymer with dichroic dye, blend of aromatic polyester homo-polymer and aromatic polyester copolymer with dichroic dye, aromatic liquid crystal polymer incorporated with dichroic dyes, oriented dichroic dye crystalline and,
wherein said thermoplastic protective layer comprises a birefringent thermoplastic protective layer.
11 . The polarizing plate of claim 10 wherein the thermoplastic protective layer has a retardation value of higher than 2,000 nm.
12 . The polarizing plate of claim 10 wherein the thermoplastic protective layer has a retardation value of less than 200 nm and a stress-optic coefficient of less than 30×10−6 mm2/N.
13 . The polarizing plate of claim 10 wherein the thermoplastic support layer and the thermoplastic protective layer are made from the same type of resin material.
14 . The polarizing plate of claim 11 wherein the thermoplastic protective layer comprises a thermoplastic sheet of resin material selected from the group consisting of a polycarbonate, a polysulfone, a polyarylate, a ester of (meth)acrylic acid, and an aromatic polyester.
15 . The polarizing plate of claim 12 wherein the thermoplastic protective layer is constructed from a thermoplastic sheet of resin material selected from the group consisting of a cellulose ester, a ester of (meth)acrylic acid, a copolymer of cyclic olefin, and a polystyrene.
16 . The polarizing plate of claim 10 , wherein said thermoplastic support layer is a polycarbonate sheet; and wherein said thermoplastic protective layer is a sheet of oriented resin material selected from the group consisting of a polycarbonate, a polysulfone, an ester of (meth)acrylic acid, and an aromatic polyester.
17 . The polarizing plate of claim 10 , wherein said thermoplastic support layer is colored for the purpose of modifying color and reducing light transmission of said polarizing plate.