New Primer Cures In Shadows

Application of the primer that ensures full cure in shadowed areas is a simple, non-invasive process that takes place off-line, directly before parts are fed into the laminating equipment.

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Rocky Hill, CT - For 4- to 15-inch displays from cell phones to monitors, a new Loctite® Primer and Liquid Optically Clear Adhesive (LOCA) combination from Henkel Corporation cures in less than 90 minutes in shadowed areas where light cannot penetrate during UV cure processes. Formulated for direct bonding, Loctite® 7389™ Primer and Loctite® 3196PR™ LOCA provide a solution for the cure through depth limitation of side curing, the work-in-process and potential damage to the LCD of heat curing, and the long cure time required for moisture cure. To fully leverage existing equipment, a simple, low-cost workstation positioned before lamination precisely and rapidly dispenses the primer and requires no modification or adjustment of the laminating process. LOCAs that are not cured properly in shadowed areas can cause bubbles, delamination, MURA and/or adhesive migration into the backlight unit of the LCD. Application of the primer that ensures full cure in shadowed areas is a simple, non-invasive process that takes place off-line, directly before parts are fed into the laminating equipment. The Loctite 200 D-Series Dispensing Robot applies solvent-based Loctite 7389 Primer to the cover glass and/or LCD using a foam transfer pad, and allows the solvent to evaporate in less than 10 seconds. The panel is then loaded into the laminating equipment, the adhesive is applied, and light cure occurs. At this point, the primer assumes responsibility for adhesive in shadowed areas, typically curing in less than 90 minutes and guaranteeing that there is no uncured adhesive that remains in the assembly.

For more information, please visit www.henkelna.com/loca.   

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