Hot-melt OCA optical adhesive film and preparation method thereof

Abstract

The invention discloses a hot-melt OCA optical adhesive film and a preparation method thereof. The hot-melt OCA optical adhesive film is a novel optical-grade material taking hot-melt resin and organic silicon resin as the main body, wherein the hot-melt resin comprises thermosetting resin and thermoplastic resin, and the organic silicon resin comprises: reactive methyl phenyl polysiloxane, methylphenyl T resin, methyl phenyl silicon resin, a phenyl cross-linking agent, a phenyl chain extender and an additive. Compared with the traditional OCA, the OCA provided by the invention has the advantages of excellent light transmission, bonding strength, cold and hot impact resistance and weather resistance.

Description

technical field [0001] The invention belongs to the technical field of OCA optical glue, and relates to a hot-melt type OCA optical glue film and a preparation method. Background technique [0002] The explosive growth of global smartphones, wearable smart products, and touch displays has brought sufficient orders and development space for OCA optical adhesive tape. Traditional OCA is to make optical acrylic without a substrate, and then attach the upper and lower layers. A layer of release film (generally also known as light release film and heavy release film), many high-end users also require another film change action during the production process to apply OCA optical adhesive to the original film. The heavy release film is replaced by a high-speed die-cutting ultra-release film. Because there is no base material, it is a kind of soft glue in terms of performance. Only two processes of film change and die-cutting have brought many difficulties to OCA optical glue manufa...

AI Technical Summary

Problems solved by technology

Because there is no base material, it is a kind of soft glue in terms of performance. Only two processes of film change and die-cutting have brought many difficulties to OCA optical glue manufacturers: 1. It must be produced in a clean environment , to ensure that the replacement film and die-cutting knife are free from fluff, lint, dirt and foreign matter, etc.; 2. To ensure that the replacement film and die-cutting knife are flat and antistatic, any unevenness in the microscopic situation will affect the release type Stress stability, atmospheric exposure resistance and non-transferability have variable effects; 3. Air bubbles and glue pulling are easy to occur during film change and die-cutting. In addition to keeping the angle of lifting the discharged waste constant and reducing glue overflow, Also need high pressure defoaming, etc.

At the same time, during the bonding process of OCA optical film, due to uneven pressure, temperature and humidity environment, and material properties, defects such as white spots, indentations, bubbles, warping, and wrinkles often occur.

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