Hot-melting light-curing optical adhesive for laminating capacitance-type touch screen and preparation method

Abstract

The invention relates to hot-melting light-curing optical adhesive for laminating a capacitance-type touch screen. The hot-melting light-curing optical adhesive is prepared from the following components in parts by weight: 50 to 70 parts of main body resin, 10 to 30 parts of auxiliary resin, 10 to 15 parts of tackifier, 1 to 5 parts of light initiator, and 0.5 to 2 parts of antioxidant; the main body resin is vinyl-vinyl acetate copolymeric resin; the auxiliary resin is acrylate modified isoprene rubber resin; the tackifier is a mixture of one or two of the following substances: terpene resinand polybutadiene rubber resin; and the antioxidant is a mixture of one or more of the following substances: beta-(3,5-di-tert-butyl-4-hydroxyphenyl)N-octadecanol propionate, 1,1,3-tri(2-methyl-4-hydroxyl-5-tert-butylphenyl)butane, dilauroyl thiodipropionate and organic phosphite. The adhesive is suitable for laminating a large-sized CTP as well as fully laminating a panel computer, a computer, aliquid crystal display, an one-piece machine, a vehicle-mounted navigator and the like, and can provide a perfect visual effect for the display of the touch screen.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a hot-melt light-curable optical adhesive for bonding capacitive touch screens and a preparation method thereof. Background technique [0002] With the rapid development of the information industry, especially with the application and explosive development of touch screen technology in electronic products such as mobile phones and notebook computers, the touch screen technology has also been rapidly developed and widely used. The bonding process of the touch screen is an important link in the production process of the touch screen, including the bonding between the sensor (sensor) and the glass cover (Coverlens) and the full bonding between the capacitive touch screen (CTP) and the liquid crystal module (LCM) All need to use the bonding process, and the accuracy and appearance of the bonding directly affect the quality and yield of the product. There are two main t...

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Problems solved by technology

[0004] The traditional solid-state laminating adhesive is OCA optical adhesive in the form of pressure-sensitive adhesive, mainly based on 3M Company, mainly optical acrylic adhesive without substrate, and then attaching a layer of release film on the upper and lower bottom layers, which is a kind of The double-sided laminating tape without matrix material needs to be laminated and then laminated. However, the lamination is difficult, the precision is high, it is easy to produce air bubbles, and it is difficult to rework after lamination. It is not suitable for some large-scale tapes. size or expensive product applications

[0005] On the basis of OCA optical adhesive, liquid optical adhesive LOCA is developed. LOCA is a single-component, UV-curable acrylate liquid optical adhesive, which is suitable for bonding touch screens and LCD panels, but this process also exists. Defects, easy glue flow, difficult to remove air bubbles, low production efficiency, etc. It is also not suitable for some large-sized or expensive products.

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