Pressure-sensitive adhesive for reflection type high-durability polaroid and polaroid with pressure-sensitive adhesive applied

Abstract

The invention discloses a pressure-sensitive adhesive for a reflection type high-durability polaroid. The pressure-sensitive adhesive comprises, by weight, 80-85% of acrylate polymer with the weight-average molecular weight being 70000-800000, 14.8-19% of hydroxyethyl acrylate polymer with the weight-average molecular weight being 30000-200000, and 0.2-1.0% of bridging agents. According to the pressure-sensitive adhesive, compared with a formula of traditional pressure-sensitive adhesive, the content of carboxy groups in the adhesive is reduced, the original adhesive force between the adhesive, the polaroid and an aluminum reflecting film and high durability are maintained, and corrosion of H+ ions in the adhesive to the aluminum reflecting film is reduced. The invention further discloses the polaroid provided with the pressure-sensitive adhesive. The aluminum reflecting film is bonded to a polaroid layer through the pressure-sensitive adhesive. As for the pressure-sensitive adhesive, the adhesive force of the adhesive is larger than 500gf / 25 cm, the viscosity ranges from 2000cps to 8000 cps, the weather resistance is improved from 80 DEG C*500hr, 60 DEG C*90%*500hr to 105 DEG C*500hr, 85 DEG C*85%*500hr, pin-hole corrosion to the reflecting layer aluminum film is avoided, the reflecting performance of the polaroid remains the same, and the using effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of optical polarizing elements, in particular to a high-durability polarizer pressure-sensitive adhesive with reflective function for LCDs and a polarizer using the pressure-sensitive adhesive. Background technique [0002] Polarizers are mainly used on LCD liquid crystal displays, and there are transmission mode, semi-transmission mode and reflection mode. The reflection mode generally uses an aluminum reflective film, and usually the aluminum reflective film is evaporated to a PET substrate (Polyethyleneterephthalate, referred to as PET, polyethylene terephthalate, the chemical formula is COC6H4COOCH2CH2O, which is a common resin) Yes, and then compound the side with aluminum on the polarizer with PSA glue (abbreviation of pressure sensitive adhesive, commonly known as pressure sensitive adhesive). [0003] The synthesis of traditional PSA original glue for polarizers is about 80% of acrylate (Acrylate es...

AI Technical Summary

Problems solved by technology

[0003] The synthesis of traditional PSA original glue for polarizers is about 80% of acrylate (Acrylate ester) and about 20% of acrylic acid (Acrylic acid) and 2-hydroxyethyl acrylate (2-Hydroxyethyl acrylate). Produced by conditioned reactions, the glue after the organic reaction also contains a certain amount of carboxyl (carboxyl)-COOH, which can be used at high temperature and high humidity (85°C×85%RH×500H, 85°C, 85% relative humidity for 500 hours) environment, the carboxylic acid group releases H + The aluminum film is corroded by ions, and the aluminum layer is poorly perforated, which affects the use effect

Images