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Liquid optically-clear adhesive (LOCA) is liquid-based bonding technology used in touch panels and display devices to bind the cover lens, plastic, or other optical materials to the main sensor unit or each other. These adhesives improve optical characteristics and durability. LOCA glue is often hardened using ultraviolet light.
There are a wide variety of adhesives used for optical bonding processes. Three of the most commonly used are silicone, epoxy, and polyurethane. [1] Below are overviews of the pros/cons of each adhesive type. Silicone: The most commonly found adhesive in optical bonding processes that dates back to the 1970s as a solution.
DAP was the first to the market with the introduction of latex caulk in 1964, and since then the company has introduced numerous other caulks, sealants, insulating foams and other patch and repair products. They followed with acrylic latex technology in 1970 and silicone sealants in the mid-1980s.
Certain optical components, such as a Wollaston prism or Nicol prism, are made of multiple transparent pieces that are directly attached to each other. The adhesive is usually index-matched to the pieces. Historically, Canada balsam was used in this application, but it is now more common to use epoxy or other synthetic adhesives.
RTV silicone (room-temperature-vulcanizing silicone) is a type of silicone rubber that cures at room temperature. It is available as a one-component product, or mixed from two components (a base and curative).
Sealant, hafting: prehistoric Mixed-protein glues [1] Casein glue: Milk, limestone and brine Milk curd is mixed with alkalis non-toxic (preservatives excepted) Once wet, 6–7 hours. ~4 hours for softwood, 8 for hardwood; must be under pressure for >0.5-2 hrs tensile strength exceeds most woods, 2,200-3,00 pounds per square inch