Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Reexamination Certificate
2000-08-08
2004-04-20
Thibodeau, Paul (Department: 1773)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
C428S328000, C428S500000, C428S515000
Reexamination Certificate
active
06723423
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a transparent sheet or film excellent in reflection reducing ability and having high electric conductivity and an excellent antistatic property, which is used as a surface of polarizing plate used in various display devices including a liquid crystal display device, such as a word processor, a computer, a television set, a plasma display panel (PDP),and a surface of a transparent plastic material, sunglasses, a cover for various meters, window glass for an automobile and an electric train, and the like.
BACKGROUND ART
A transparent substrate, such as glass and plastics, is used as a corner mirror, a rear-view mirror, goggle, window glass, a personal computer, a word processor, a PDP, an LCD (liquid crystal display), various commercial designs, and the like. When we observe the objects such as letters and graphics through the transparent substrate, there is a problem that we cannot notice the substances clearly because of reflection on the surface of the transparent subjects. As a method for preventing the light reflection on the transparent substrate, there is a conventional method, in which a about 0.1 &mgr;m thick thin film of MgF
2
, SiO
2
and the like is formed on the surface of glass or plastics by a gas phase method, such as a plasma CVD (chemical vapor deposition) method and the like. In order to impart the antistatic property, it is necessary that a metallic film having high transparency, such as ITO, ATO and the like, is formed in the similar manner.
However, the method of forming the about 0.1 &mgr;m thick thin film of MgF
2
, SiO
2
and the like on the transparent substrate, such as surface of glass, a plastic substrate and the like has disadvantages that a complicated process and a large-scale apparatus are required, and the productivity is poor to increase the cost thereof.
The object of the invention is to provide an inexpensive transparent sheet or film having an antistatic property and a reflection reduction property having good productivity.
DISCLOSURE OF THE INVENTION
The invention relates to:
(1) A transparent sheet or film having on one surface of a transparent support, a first electroconductive transparent layer comprising a cured layer of a resin containing fine particles of electroconductive zinc antimonate anhydride, and a second electroconductive transparent layer formed on the first layer, of which a refractive index is lower than that of the first layer;
(2) A transparent sheet or film as described in item (1), wherein the first electroconductive transparent layer contains a dispersant;
(3) A transparent sheet or film as described in item (1) or (2), wherein the above mentioned fine particles are zinc antimonate anhydride having a primary particle diameter of 0.5 micron or less, and the resin is an ultraviolet ray-curable (meth)acrylate having two or more (meth)acryloyl groups in a molecule thereof;
(4) A transparent sheet or film as described in item (1) or (2), wherein the above mentioned fine particles are zinc antimonate having a particle diameter, by a BET method, of 18 nm or less and an average particle diameter, by a dynamic light scattering method, of 100 nm or less, and of which resin comprises an ultraviolet ray-curable (meth)acrylate having two or more (meth)acryloyl groups in a molecule thereof;
(5) A transparent sheet or film as described in any one of items (1) to (4), wherein a content ratio of the electroconductive zinc antimonate anhydride is from 50 to 90% by weight;
(6) A transparent sheet or film as described in any one of items (1) to (5), wherein the first electroconductive transparent layer has a refractive index (25° C.) of 1.55 or higher;
(7) A transparent sheet or film as described in any one of items (1) to (6), wherein the second layer has a refractive index of 1.48 or less;
(8) A transparent sheet or film as described in any one of items (1) to (7), wherein the second layer contains a surface active agent;
(9) A transparent sheet or film as described in any one of items (1) to (8), wherein the second has a thickness of 1 &mgr;m or less;
(10) A transparent sheet or film as described in any one of items (1) to (9), which has a hard coated layer comprising an ultraviolet ray-curable (meth) acrylate resin having two or more (meth)acryloyl groups in a molecule thereof, between the transparent support and the first layer;
(11) A transparent sheet or film as described in any one of items (1) to (10), which has a transparent layer comprising an ultraviolet ray-curable transparent hard coating agent and having a refractive index higher than that of the first layer between the first layer and the second layer;
(12) A transparent sheet or film as described in item (11), wherein the ultraviolet ray-curable transparent hard coating agent of a high refractive index comprises an ultraviolet ray-curable binder containing an ultraviolet ray-curable resin having two or more (meth)acryloyl groups in a molecule thereof, and fine particles of a high refractive index comprising a metal or a metallic oxide; and the transparent layer comprising the transparent hard coating agent has a refractive index of 1.55 or higher;
(13) A transparent sheet or film as described in item (11), wherein the fine particles of a high refractive index are zirconium oxide, titanium oxide, cerium oxide, zinc oxide, indium oxide or a three-component sol of titanium oxide, zirconium oxide and tin oxide, and have an average particle diameter of 0.5 &mgr;m or less;
(14) A transparent sheet or film as described in any one of items (10) to (13), characterized that the transparent sheet or film has fine unevenness on the surface , facing the first layer, of the hard coated layer formed between the transparent support and the first layer, and the hard coated layer being made from the ultraviolet ray-curable (meth)acrylate resin, or on the surface, facing the second layer, of the transparent layer having high refractive index of the ultraviolet ray-curable transparent hard coat agent;
(15) A transparent sheet or film as described in any one of items (1) to (14), which has an adhesive agent layer on the other surface of the transparent support;
(16) A transparent sheet or film as described in item (15), wherein the adhesive agent is colored by a coloring agent;
(17) A transparent sheet or film as described in item (16), wherein the coloring agent is a pigment;
(18) A transparent sheet or film which comprises having, on one surface of the transparent support, a hard coating layer of an ultraviolet ray-curable (meth)acrylate resin having two or more (meth)acryloyl groups in a molecule thereof, and a first electroconductive transparent layer which comprises a cured layer of a resin containing fine particles of electroconductive zinc antimonate anhydride being formed thereon, and a second electroconductive transparent layer being formed on the first electroconductive transparent layer of which refractive index is lower than that of the first layer, wherein the fine particles of zinc antimonate are zinc antimonate having a particle diameter, by a BET method, of 18 nm or less and an average particle diameter, by a dynamic light scattering method, of 100 nm or less and wherein said resin of the second layer comprises an ultraviolet ray-curable (meth)acrylate having two or more (meth)acryloyl groups in a molecule thereof and a content ratio of the electroconductive zinc antimonate anhydride is from 50 to 90% by weight and of which haze is 1.5 or less and a reflectivity is 2% or less;
(19) A display device on which a transparent sheet or film as described in any one of items (1) to (18) is attached;
(20) An electroconductive transparent hard coat agent comprising a sol of electroconductive zinc antimonate anhydride having a particle diameter, by a BET method, of 18 nm or less and an average particle diameter, by a dynamic light scattering method, of 100 nm or less, and a dispersant;
(21) An electroconductive transparent hard coating agent as described in item (20), which contains an ultraviolet ray-curable resin; and
(22) An electrocon
Kaneko Shoichi
Sakurai Hiroshi
Takahashi Takeshi
Ahmed Sheeba
Nields & Lemack
Nippon Kayaku Kabushiki Kaisha
Thibodeau Paul
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