# US 11,298,925 B2 · Electroconductive film, touch panel, and image display device

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- Number: US 11,298,925 B2
- Document ID: US11298925B2
- Status: Granted
- Kind: B2
- Application number: 16/922,239
- Filed: 2020-07-07
- Published: 2020-12-17
- Granted: 2022-04-12
- Earliest claimed: 2016-09-30
- Assignees: Dai Nippon Printing Co., Ltd.
- Applicants: Dai Nippon Printing Co., Ltd.
- Inventors: Shoichiro Ogumi; Yoshimasa Ogawa; Eiji Ooishi; Yukimitsu Iwata; Yuji Shimizu; Ryota Kitayama; Hiroaki Mutou
- Web page: https://patentgrep.com/patent/US11298925B2

## CPC

- B32B 27/18: characterised by the use of special additives
- B32B 7/02: Physical, chemical or physicochemical properties
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 23/00: Layered products comprising {a layer of} cellulosic plastic substances {, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose}
- B32B 23/08: of synthetic resin
- B32B 25/08: of synthetic resin
- B32B 25/14: comprising {synthetic rubber copolymers (B32B25/18 and B32B25/20 take precedence)}
- B32B 27/08: of synthetic resin
- B32B 27/281: {comprising polyimides}
- B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers}
- B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers}
- B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 27/38: comprising epoxy resins
- B32B 27/40: comprising polyurethanes
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/044: by capacitive means
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- H10K 30/82: Transparent electrodes, e.g. indium tin oxide [ITO] electrodes
- H10K 59/40: OLEDs integrated with touch screens
- H10K 71/621: {Providing a shape to conductive layers, e.g. patterning or selective deposition}
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- B32B 2260/021: Fibrous or filamentary layer
- B32B 2260/046: Synthetic resin
- B32B 2262/02: Synthetic macromolecular fibres
- B32B 2262/103: Metal fibres
- B32B 2262/106: Carbon fibres, e.g. graphite fibres
- B32B 2264/102: Oxide or hydroxide
- B32B 2264/105: Metal
- B32B 2307/20: having particular electrical or magnetic properties, e.g. piezoelectric
- B32B 2307/202: Conductive
- B32B 2307/40: having particular optical properties
- B32B 2307/546: Flexural strength; Flexion stiffness
- B32B 2457/208: Touch screens
- G06F 2203/04111: Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
- G06F 2203/04112: Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

One aspect of the present invention provides a light-transmitting electroconductive film 10 comprising a light-transmitting base material 11 and an electroconductive part 13 provided on one surface of the light-transmitting base material 11, wherein the electroconductive part 13 includes a light-transmitting resin 15 and plural electroconductive fibers 16 incorporated in the light-transmitting resin 15, and the electroconductive part 13 can conduct electricity from the surface 13A of the electroconductive part 13, and the electroconductive fibers 16 as a whole are unevenly distributed on the light-transmitting base material side than the position HL, which is located at half the film thickness of the electroconductive part 13 in the electroconductive part 13, and the electroconductive part 13 has a surface resistance value of 200Ω/□ or less, and the electroconductive film 10 has a haze value of 5% or less.

## Claims

### Claim 1

A light-transmitting electroconductive film comprising a light-transmitting resin base material and an electroconductive part provided on at least one surface of the light-transmitting resin base material,
wherein the electroconductive part comprises a light-transmitting resin and plural electroconductive fibers incorporated in the light-transmitting resin;
the electroconductive part can conduct electricity from the surface of the electroconductive part;
the electroconductive part is provided directly on at least one surface of the light-transmitting resin base material;
the electroconductive part has a surface resistance value of 200Ω/□ or less;
the electroconductive film has a haze value of 5% or less; and
a ratio of an electrical resistance in a second direction to that in a first direction is 2 or more when the electrical resistance values on the surface of the electroconductive part are measured in a predetermined size in six different directions including an arbitrary direction for each an angle of 30 degrees to the arbitrary direction in the surface of the electroconductive part, wherein a direction in which the electroconductive part shows the lowest electrical resistance value is designated as the first direction, and a direction which is orthogonal to the first direction is designated as the second direction.

### Claim 2

A light-transmitting electroconductive film comprising an underlayer and an electroconductive part in this order on at least one surface of a light-transmitting resin base material,
wherein the electroconductive part comprises a light-transmitting resin and plural electroconductive fibers incorporated in the light-transmitting resin;
the underlayer is provided directly on at least one surface of the light-transmitting resin base material;
the electroconductive part is provided directly on the underlayer;
the electroconductive part has a surface resistance value of 200Ω/□ or less;
the electroconductive film has a haze value of 5% or less; and
a ratio of an electrical resistance value in a second direction to that in a first direction is 1 or more and less than 2 when the electrical resistance values on the surface of the electroconductive part are measured in a predetermined size in six different directions including an arbitrary direction for each an angle of 30 degrees to the arbitrary direction in the surface of the electroconductive part, wherein a direction in which the electroconductive part shows the lowest electrical resistance value is designated as the first direction, and a direction which is orthogonal to the first direction is designated as the second direction.

### Claim 3

A light-transmitting electroconductive film comprising an underlayer and an electroconductive part in this order on at least one surface of a light-transmitting resin base material,
wherein the electroconductive part comprises a light-transmitting resin and plural electroconductive fibers incorporated in the light-transmitting resin;
the underlayer is provided directly on at least one surface of the light-transmitting resin base material;
the electroconductive part is provided directly on the underlayer;
the electroconductive part has a surface resistance value of 200Ω/□ or less;
the electroconductive film has a haze value of 5% or less; and
a ratio of an electrical resistance in a second direction to that in a first direction is 2 or more when the electrical resistance values on the surface of the electroconductive part are measured in a predetermined size in six different directions including an arbitrary direction for each an angle of 30 degrees to the arbitrary direction in the surface of the electroconductive part, wherein a direction in which the electroconductive part shows the lowest electrical resistance value is designated as the first direction, and a direction which is orthogonal to the first direction is designated as the second direction.