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Substrates for touch sensors

A technology of touch sensor and substrate, applied in the direction of instruments, applications, home appliances, etc., can solve the problems of difficult processing and expensive COP

Active Publication Date: 2021-01-12
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, COP is expensive and difficult to process

Method used

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  • Substrates for touch sensors
  • Substrates for touch sensors
  • Substrates for touch sensors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0026] Material

[0027] Polyethylene terephthalate (PET) was purchased from NanYa Plastics Corporation (Taipei, Taiwan) in pellet form and designated by product grade 1N502.

[0028] Ethylene glycol-modified polyethylene terephthalate polyester (PETg) was purchased from Eastman Chemical Company (Kingsport, TN) and sold by product grade EASTAR GN071 copolyester designation.

[0029] Cycloolefin polymer (COP) was purchased from Zeon Corporation (Tokyo, Japan) in film form and designated by the product grade ZEONORFILM ZF-16.

[0030] Test Methods

[0031] Melting point (T m ) determination

[0032] Melting points were determined by a Q1000 Differential Scanning Calorimeter (DSC) commercially available from TA Instruments (New Castle, DE). The scan rate was 20°C / min from 23°C to 300°C.

[0033] Stress Birefringence Uniformity Test

[0034] Stretched films were tested for stress birefringence uniformity by placing the film between two absorbing polarizers with the ...

Embodiment 1

[0046] On the test melt extrusion line, two twin-screw extruders were used. Two extruders fed a 3-layer feedblock in ABA configuration. The extruder feeding the two skin (A) layers had one resin feeder delivering PETg resin at 1.5 kg / hr. The other extruder (B) has two resin feeders, one delivering PET at a rate of 6.8 kg / hr and the other delivering PETg at a rate of 1.7 kg / hr, for a total rate of 8.5 kg / hr to in the core layer. The melt line temperature was set at 274°C and the screw speed of both extruders was set at 100 rpm. PET and PETg are known to react to form block copolymers when extruded together in this manner. The 3-layer melt from the feedblock was fed to the film die and cast on chill rolls, and the line speed was adjusted to control the cast thickness. Sheets of cast film were stretched using a laboratory orienter for controlled sequential stretching. The stretch ratio in the machine direction was 1.2 and the stretch ratio in the transverse direction was 4.7...

Embodiment 2

[0048] On the test melt extrusion line, two twin-screw extruders were used. Two extruders fed a 3-layer feedblock in ABA configuration. The extruder feeding the two skin (A) layers had one resin feeder delivering PETg resin at 1.5 kg / hr. The other extruder (B) had two resin feeders, one delivering PET and the other delivering PETg, each at a rate of 4.25 kg / hr for a total rate of 8.5 kg / hr into the core layer. The melt line temperature was set at 274°C and the screw speed of both extruders was set at 100 rpm. PET and PETg are known to react to form block copolymers when extruded together in this manner. The 3-layer melt from the feedblock was fed to the film die and cast on chill rolls, and the line speed was adjusted to control the cast thickness. Sheets of cast film were stretched using a laboratory orienter for controlled sequential stretching. The stretch ratio in the machine direction was 1.2 and the stretch ratio in the transverse direction was 4.7. The stretching tem...

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Abstract

This invention describes substrates suitable for use in touch sensors. In some cases, the substrate includes an inner layer and a first outer heatset polymer layer and a second outer heatset polymer layer. The first outer layer and the second outer layer each have an in-plane birefringence of less than 0.1. The inner layer is substantially uniaxially birefringent and has an in-plane birefringence greater than 0.01. In some cases, the substrate comprises a block copolymer comprising a first polyester and a second polyester. The melting point of the first polyester is greater than 200°C, and the melting point of the second polyester is less than 200°C. The block copolymer comprises 50% to 80% by weight of the second polyester. The substrate is substantially uniaxially birefringent with an in-plane birefringence between 0.001 and 0.1.

Description

Background technique [0001] Touch sensors typically include electrodes disposed on a surface of a substrate. Conventional substrates comprise cyclic olefin polymers (COP). However, COP is expensive and difficult to process. Contents of the invention [0002] In some aspects of the present specification, there is provided a substrate comprising a first outer layer and a second outer layer and an inner polymer layer disposed between the first outer layer and the second outer layer and in contact with the first outer layer. The outer layer is in direct contact with the second outer layer. Each of the first outer layer and the second outer layer is a heatset polymer layer. The composition of the inner layer is different from the composition of the first outer layer and different from the composition of the second outer layer. Each of the first outer layer and the second outer layer has an in-plane birefringence of less than 0.1, and the inner layer is substantially uniaxiall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B7/02B32B27/36G06F3/041B32B7/023
CPCB32B27/08B32B27/36B32B2307/42B32B2307/538B32B2457/208B32B2250/244G06F3/0412B32B7/023G02F1/13338B32B37/153G02B5/305G02B5/3083G02F1/1343G06F2203/04103G06F3/041
Inventor 理查德·Y·刘德里克·W·帕茨曼斯蒂芬·A·约翰逊
Owner 3M INNOVATIVE PROPERTIES CO