| CPC G06F 3/03545 (2013.01) [G06F 3/0383 (2013.01); G06F 3/041 (2013.01); B32B 2307/75 (2013.01)] | 5 Claims |
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1. A dot film that enables tracking of a writing trajectory of an electronic pen so that writing is recognized and displayed on a screen or blackboard of an image device, which is formed by applying a resin mixture to a base layer of a synthetic resin, printing a printing material on a rear surface of a resin layer so as to impregnate it thereon and to form fine dots, and then separating and removing the base layer from the resin layer, and then attaching a protective film to a front surface of the separated resin layer,
wherein the fine dots are formed on a grid line at intervals from crossing points of virtual grid lines to have a dot value, and have location information encrypted therein so as to determine location information of the electronic pen when writing with the electronic pen,
wherein the resin mixture contains 30 to 50% by weight of a polyolefin-based resin, 15 to 25% by weight of a silicone resin, 15 to 25% by weight of an urethane methacrylate oligomer, 5 to 10% by weight of methylene diphenyl diisocyanate, 1 to 5% by weight of tetrahydrofurfuryl methacrylate, 1 to 5% by weight of polyvinylpyrrolidone, 1 to 3% by weight of 2-phenoxyethyl methacrylate, 1 to 3% by weight of polymethacrylate, 0.5 to 2% by weight of 1,4-phenylenebisoxazoline, 0.5 to 1.5% by weight of 1,4-butanediol diacrylate, 0.5 to 1.5% by weight of tetraethylene glycol dimethacrylate, 0.5 to 1.5% by weight of bis(3-ethyl-5-methyl-4-maleimidophenyl)methane, 0.5 to 1.5% by weight of N-[4-(2-benzimidazolyl)phenyl]maleimide, 0.5 to 1.5% by weight of stannous oleate, 0.5 to 1.5% by weight of dibutyltin diacetate, 0.5 to 1.5% by weight of N,N′-bis(2-methyl-1-imidazolyl ethyl) urea, 0.1 to 1.0% by weight of p-toluenesulfonyl hydrazide, 0.1 to 1.0% by weight of epichlorohydrin, and 0.5 to 1.0% by weight of an antistatic agent,
wherein the protective film is made of PET or polycarbonate, is detachably attached and thus is provided to be replaced, and has a coating layer applied with a thickness of 0.1 to 0.5 mm on an outer surface thereof to provide an anti-glare function and a UV blocking function, and
wherein the coating layer includes 30 to 50 parts by weight of acrylate monomer, 1 to 5 parts by weight of 4,4′-diaminobenzophenone, 15 to 20 parts by weight of tris[(3-mercaptopropionyloxy)-ethyl]-isocyanurate (TEMPIC), 1 to 5 parts by weight of menthyl anthranilate, 1 to 5 parts by weight of 3-glycidoxypropylmethyldiethoxysilane, 1 to 5 parts by weight of a polyether siloxane copolymer, 0.1 to 0.5 parts by weight of a dispersing agent, 0.1 to 0.5 parts by weight of an antifoaming agent, and 0.1 to 0.5 parts by weight of a thickener, based on 100 parts by weight of polyurethane acrylate oligomer.
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