Preparation process of high-end release protection polyester base film for OCA

Abstract

The invention discloses a preparation process of a high-end release protection polyester base film for an OCA, which comprises the OCA. The OCA is produced by adopting an ABA three-layer structure, when the OCA is laminated, the thickness of a light release film is generally required to be 25-55 mum, the release force is 5-20 mm / g, and the thickness of a heavy release film is 50-100 mum, and the release force is 30-110 mm / g, the thickness of the adhesive layer is 45-100 mum, the shore hardness is 40-50 D, when a customer needs electrostatic treatment, the viscosity of one surface of the film before coating is about 5500 mps.s, and the solid content is about 95%, and by compounding and superposing the multiple adhesive layers, the obtained OCA has a better effect on the basis of ensuring complete curing of each adhesive layer, and has excellent optical apparent performance, excellent transparency and good haze, is free of crystal points, white points and other impurities and foreign matters, and can realize observation of bubbles, foreign matters and other defects in OCA under the condition of not removing the protective film.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal display, and specifically relates to a preparation process of a high-end release-type protective polyester base film for OCA optical glue. Background technique [0002] OCA optical adhesive is one of the raw materials of the touch screen, and it is the best adhesive for the touch screen. The base material is made of optical acrylic pressure-sensitive adhesive, and then a layer of optical release film is pasted on the upper and lower bottom layers to make a double-sided adhesive tape. , which is an irreplaceable role in the normal image display of the LCD panel. It has the advantages of high cleanliness, high light transmittance, low haze, high adhesion, no crystal point, no bubbles, water resistance, high temperature resistance, and ultraviolet resistance. And it has uniform thickness, high flatness, and similar refractive index to glass and PC. Long-term use will not cause problems such as...

AI Technical Summary

Problems solved by technology

[0003] High-end release protective polyester base film materials for OCA optical adhesives have been monopolized by foreign companies for a long time due to high-tech barriers. At present, some domestic manufacturers of liquid crystal display companies have only two brands that fully paste OCA optical adhesives, such as Japan and the United States. The company, these two brands account for more than 85% of the market share in the full lamination market, and its corresponding OCA film materials are also monopolized by several giants such as South Korea and Japan. However, with the rapid increase of the OCA market, domestic OCA film materials A large number of processing enterprises have also emerged, mainly in Guangdong, Zhejiang, Jiangsu, etc., while my country's high-end release protective polyester base film industry for OCA optical adhesives is still in its infancy, with weak and scattered R&D capabilities. The performance of the base film has not yet been developed. Most domestic polyester film base film manufacturers lack experience in key links and manufacturing technical conditions, coupled with differences in raw materials, so that the products can only meet low-end applications. In addition, global smartphones, wearable smart phones, etc. The explosive growth of products and touch screens has brought unprecedented development space for OCA optical adhesive products

Images