US 11,053,393 B2
Hard coating layered optical film, polarizer comprising the same, and image display comprising the hard coating layered optical film and/or the polarizer comprising the same
Ching-Huang Chen, Taoyuan (TW); Tze-Chi Wang, Taoyuan (TW); Kuo-Hsuan Yu, Taoyuan (TW); and Gang-Lun Fan, Taoyuan (TW)
Assigned to BenQ Materials Corporation, Taoyuan (TW)
Filed by BenQ Materials Corporation, Taoyuan (TW)
Filed on Feb. 26, 2020, as Appl. No. 16/801,284.
Application 16/801,284 is a division of application No. 16/210,231, filed on Dec. 5, 2018.
Prior Publication US 2020/0248002 A1, Aug. 6, 2020
Int. Cl. G02B 1/14 (2015.01); C09D 5/00 (2006.01); C09D 175/14 (2006.01); C09D 7/47 (2018.01); G02B 1/111 (2015.01); C09D 7/40 (2018.01); C09D 135/02 (2006.01); C09D 7/65 (2018.01); C09D 175/16 (2006.01)
CPC C09D 5/006 (2013.01) [C09D 5/002 (2013.01); C09D 7/47 (2018.01); C09D 7/65 (2018.01); C09D 7/67 (2018.01); C09D 7/70 (2018.01); C09D 135/02 (2013.01); C09D 175/14 (2013.01); C09D 175/16 (2013.01); G02B 1/111 (2013.01); G02B 1/14 (2015.01); Y10T 428/24355 (2015.01); Y10T 428/24364 (2015.01)] 6 Claims
 
1. A hard coating film comprising a polymethyl methacrylate (PMMA) base film, an antiglare hard coating layer formed on the polymethyl methacrylate (PMMA) base film, and a low refractive layer formed on the antiglare hard coating layer, wherein the antiglare hard coating layer is formed by coating a curable mixture including a (meth)acrylate composition, an initiator, silica nanoparticles, organic microparticles and a leveling agent on the polymethyl methacrylate (PMMA) base film and curing thereafter, wherein the (meth)acrylate composition consists of:
a urethane (meth)acrylate oligomer with a functionality of 6 to 15 and a molecular weight ranging between 1,000 and 4,500, and a viscosity ranging between 25,000 cps (at 25° C.) and 86,000 cps (at 25° C.);
at least one (meth)acrylate monomer with a functionality of 3 to 6; and
at least one (meth)acrylate monomer with functionality of less than 3;
wherein the low refractive layer is formed by coating a curable mixture including a binder resin, a plurality of hollow silica nanoparticles, an initiator, and a leveling agent comprising a perfluoropolyether group-containing (meth)acrylic-modified organosilicone on the antiglare hard coating layer and curing thereafter, and surface roughnesses of the low refractive layer has a mean spacing between peaks (Sm) of between 20 μm and 90 μm, an arithmetic mean deviation of surface (Ra) of between 0.03 μm and 0.07 μm, a largest peak to valley height (Ry) of between 0.15 μm to 0.40 μm, and a ten-point mean roughness (Rz) of between 0.10 μm to 0.50 μm;
wherein the reflectivity of the hard coating film is ranging between 1.2% and 1.4%.