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Thermal-melt optical clear adhesive (TOCA) and bonding method

An optically transparent, hot-melt adhesive film technology, used in chemical instruments and methods, film/sheet adhesives, non-polymer organic compound adhesives, etc. , The operator's experience requirements are high, and the bubbles are difficult to remove, etc., to achieve the effect of easy to master, high experience requirements, and easy to eliminate

Inactive Publication Date: 2014-05-28
SHENZHEN EVER GLORY PHOTOELECTRICITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether it is OCA or LOCA, when bonding a large-sized touch screen (above 7 inches), there will be a problem that the air bubbles are difficult to remove. For LOCA, it is also easy to cause glue overflow.
[0005] In the lamination process of small-sized touch screens, it is also necessary to strictly control the process conditions and require high experience of operators, which greatly limits the existing lamination efficiency and one-time lamination success rate, making the existing one-time lamination pass rate Only at 70-80%, there are a large number of unqualified products that require complicated rework

Method used

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  • Thermal-melt optical clear adhesive (TOCA) and bonding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Thermosetting optically transparent hot melt adhesive film (TOCA), the thickness is 0.35mm, and its composition raw materials are:

[0043] 40 parts of natural rubber, 30 parts of plasticizer, 30 parts of reactive diluent, 1 part of antioxidant, 10 parts of free radical initiator, 3 parts of coupling agent;

[0044] in,

[0045] The reactive diluent is composed of isobornyl methacrylate and methoxytripropylene glycol monoacrylate in a mass ratio of 2:1.

[0046] The plasticizer consisted of DEHP,

[0047] The antioxidant consists of Irganox 1141,

[0048] The free radical initiator consists of tert-butyl peroxybenzoate,

[0049] The coupling agent consists of KH550.

[0050]

Embodiment 2

[0052] Thermosetting optically transparent hot melt adhesive film (TOCA), the thickness is 0.25mm, and its composition raw materials are:

[0053] 60 parts of thermoplastic elastomers, 20 parts of reactive diluents, 15 parts of plasticizers, 0.5 parts of antioxidants, 3 parts of free radical initiators;

[0054] in,

[0055] The thermoplastic elastomer is composed of silicone rubber and TPE in a mass ratio of 3:1.

[0056] The reactive diluent is composed of methoxy polyethylene glycol (350) monoacrylate CD551 and ethoxylated trimethylolpropane triacrylate in half,

[0057] The plasticizer is composed of DOP and DIP in a mass ratio of 4:3,

[0058] The antioxidant is composed of 1076 and 168 in a mass ratio of 5:2,

[0059] The free radical initiator consisted of dicyclohexyl peroxydicarbonate.

[0060]

Embodiment 3

[0062] Thermosetting optically transparent hot melt adhesive film (TOCA), the thickness is 0.45mm, and its composition raw materials are:

[0063] 70 parts of thermoplastic elastomers, 15 parts of reactive diluents, 15 parts of plasticizers, 0.5 parts of free radical initiators, 2 parts of coupling agents;

[0064] in,

[0065] The thermoplastic elastomer is composed of SBS and SIS at a mass ratio of 2:1,

[0066] The reactive diluent consists of tripropylene glycol diacrylate,

[0067] The plasticizer consists of 1,2,4-triisooctyl trimellitate,

[0068] The free radical initiator consists of azobisisobutyronitrile,

[0069] The coupling agent consists of KH570 and KH550 in half.

[0070]

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Abstract

The invention discloses a thermal-melt optical clear adhesive (TOCA) and a method. The thermal-melt optical clear adhesive is composed of natural rubber or a thermoplastic elastomer, a plasticizer, an active diluent, an anti-oxidant, a radical initiator and a coupling agent. The thermal-melt optical clear adhesive has better bonding stress and good transmittance, and is easy to eliminate the bubbles, glue-spilling is difficultly generated while heating to melt, and the thermal-melt optical clear adhesive is especially suitable for bonding with a large-size touch screen. The thermal-melt optical clear adhesive is a great breakthrough based on a first generation optical clear adhesive (OCA) and a second generation optical clear adhesive (LOCA), a novel technology and equipment are cooperated, so that the bubble problem generated during a bonding process can be greatly solved, the method has the advantages of high yield, simple process, convenient repair and high production efficiency, so that the thermal-melt optical clear adhesive belongs to the third generation optical clear adhesive.

Description

technical field [0001] The invention relates to an optically transparent adhesive film and a bonding method thereof, in particular to a thermosetting optically transparent hot-melt adhesive film (Thermal-melt Optical Clear Adhesive, TOCA) and a bonding method thereof. Background technique [0002] The development of touch technology has greatly facilitated human-computer interaction operations. Therefore, more and more devices have touch operation functions. The demand for touch screens is also increasing. [0003] Touch screens are mainly divided into two types: capacitive and resistive. Capacitive touch screens are more convenient to operate and have become mainstream touch screens. The touch screen generally consists of three layers, which are protective glass, touch layer and display layer from top to bottom. In order to make the touch screen have better performance, it is necessary to stick each layer together to eliminate the air between the layers, so that the scree...

Claims

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Application Information

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IPC IPC(8): C09J7/00C09J4/02C09J4/06B32B37/12
Inventor 周盾白李衡均
Owner SHENZHEN EVER GLORY PHOTOELECTRICITY
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