Optical transparent double-side adhesive tape

Abstract

The invention discloses an optical transparent double-side adhesive tape, which comprises three layers which are sequentially an OCA (optically clear adhesive) layer, a transparent substrate layer and an OCA layer, wherein the transparent substrate layer is made of a PET (polyethylene terephthalate) material, a PC (polycarbonate) material or a PMMA (polymethylmethacrylate) material. The thickness of the OCA layer is not greater than 0.6mm; the thickness of the transverse substrate layer is not greater than 2.0mm; the optical transparent double-side adhesive tape can be easily made to be thick; through the design of a three-layer structure, the thickness range is wider; the integral thickness can be realized through regulating the thickness of the OCA layers at the two sides and the transparent substrate layer in the middle; the wide thickness range can be realized regardless of using a solvent method or a non-solvent method; a transparent substrate is used for blocking between the OCA optical adhesive, so that the qualification rate in the die cutting process is effectively improved; the cost of the single optical transparent double-side adhesive tape is reduced.

Description

technical field [0001] The invention relates to an optical adhesive, in particular to an optically transparent double-sided adhesive tape applied in the field of touch screens. Background technique [0002] Optically transparent adhesive, or OCA optical adhesive, is a transparent film structure with excellent light transmission, and it is also one of the main optical components used in capacitive touch screens. It is difficult to achieve bubble-free lamination in the manufacturing process of the capacitive touch screen in the prior art, so a thick optically transparent adhesive is required to obtain an acceptable yield rate. Generally, capacitive touch screens within 5 inches use optically transparent glue with a thickness of 0.175mm-0.2mm, and capacitive touch screens above 5 inches use optically transparent glue with a thickness of 0.25mm-0.35mm. The optically transparent glue in the prior art mainly exists in the form of a pure glue film. Although it has the advantages o...

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Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the present invention provides an optically transparent double-sided adhesive tape to solve the problems in the prior art that the optically transparent adhesive is difficult to make thick and has poor die-cutting performance

[0005] By designing the optically transparent double-sided tape into a three-layer structure, the middle layer uses a transparent substrate, and the two sides of the transparent substrate use OCA optical adhesive, so that the thickness of the entire optically transparent double-sided tape can be adjusted by adjusting the thickness of OCA optical adhesive or transparent substrate. The thickness can be adjusted to solve the problem of difficult manufacture of thick optically transparent double-sided tape; the added transparent substrate makes the middle of OCA optical adhesive have a layer of substrate barrier, which can effectively improve the yield rate in the die-cutting process. It also virtually reduces the cost of a single piece of optically transparent double-sided tape

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