Optical pressure sensitive adhesive for vehicle display

With the booming development of the on-board display industry, the original contact screen (TP) and display module (LCM) because of the iron frame, optical pressure sensitive glue (OCA) can not do more than 500μm thickness, the entire industry uses basic water glue to fill, with the iron frame gradually eliminated, the display structure becomes thinner, optical pressure sensitive adhesives with thickness between 150μm and 350μm are gradually being used in the market.

Then the optical pressure-sensitive adhesive that plays the filling and bonding role in the vehicle display is particularly important. Conventional optical pressure-sensitive adhesive formulations use raw materials that use prepolymers containing double bonds or long molecular chains of acrylate polymers, adding initiators, acrylate monomers, antioxidants, leveling agents, etc., in accordance with a certain proportion to mix into optical pressure-sensitive adhesive glue.

The glue is coated between the release film and then cured to get the finished product. Filling of this OCA formula even if you can do a large, it is difficult to get good filling on the vehicle, because the better the filling, the softer the colloidal properties, then the corresponding adhesion and reliability will decline, assuming that the soft monomer is placed too much, then 105℃/ 1000H of this relatively strict reliability test will appear bubbles and other bad problems.

Therefore, the filling capacity of common onboard optical pressure-sensitive adhesives on the market is only about 20% (200μm optical pressure-sensitive adhesive can be used in ink cover glass below 40μm). One purpose is to provide an optical pressure sensitive adhesive for on-board display, in order to solve the existing technology of optical pressure sensitive adhesive used on the vehicle is difficult to get a good filling or very good filling, but poor adhesion and reliability. The invention uses resinous polymer and acrylic monomer, photoinitiator, and leveling agent to mix while ensuring reliability, greatly improving the filling and adhesion of the product.