Pressure-sensitive adhesive and preparation method thereof

Abstract

The invention provides a pressure-sensitive adhesive and a preparation method thereof. The pressure-sensitive adhesive in the invention has a low Tandelta, and Tandelta tends to be stable, and therefore, the pressure-sensitive adhesive has an extensive application prospect. The pressure-sensitive adhesive is polymerized from acrylate monomers and an oligomer in the presence of a photoinitiator. The first acrylate monomer, in a weight ratio of above 10%, is selected from alkyl alcohol acrylate, and / or methyl alkyl alcohol acrylate, and the alkyl alcohol contains more than 6 carbon atoms. The second acrylate monomer, in a weight ratio of above 10%, is selected from cycloalkyl alcohol acrylate, and / or methyl cycloalkyl alcohol acrylate. The oligomer, in a weight ratio of above 20%, has a molecular weight of more than 30000.

Description

technical field [0001] The invention relates to the field of optical display, in particular to a pressure-sensitive adhesive for bonding optical display devices and a preparation method thereof. Background technique [0002] With the wide application and rapid development of optical displays, the requirements for optical pressure-sensitive adhesives are getting higher and higher. Acrylic resin is one of the commonly used pressure-sensitive adhesives. It is widely used because of its many advantages: 1. High adhesion on PET surface or similar materials; 2. Colorless and transparent appearance and good weather resistance; 3. No additives are required, and the formula is simple; 4. Pressure-sensitive adhesives that meet various performance requirements can be prepared by copolymerization and cross-linking. [0003] However, with the rapid development of electronic products, acrylic resin adhesives still have certain limitations. For example, optical adhesives with lower Tanδ ...

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Problems solved by technology

[0003] However, with the rapid development of electronic products, acrylic resin adhesives still have certain limitations

For example, optical adhesives with lower Tanδ (loss modulus / storage modulus) are required in specific applications such as flexible display devices, but traditional acrylic resins contain many entanglements in the molecular chain, so Tanδ It is relatively high, and above 50°C, the molecular chain structure of the resin begins to change, and the storage elastic modulus cannot remain unchanged, so Tanδ is also easy to change, and it is difficult to meet market requirements

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