Curable Optically Clear Pressure-Sensitive Adhesives

ABSTRACT

A prototype transfer label construction that includes (a) an optically clear curable pressure-sensitive adhesive layer, (b) a curable epoxy layer, and (c) a transparent carrier layer has been developed. This transfer label construction is particularly useful for protective coatings in color filters for use in a liquid-crystal display panel structure. The curable epoxy and the curable pressure-sensitive adhesive (PSA) are applied to the color filter and then exposed to ultra violet (UV) radiation. The radiation transforms the PSA from a removable adhesive to a permanent adhesive. The color filter with the UV-cured adhesive is then baked to fully cure the adhesive layer, which further transforms the adhesive into an ultra-high-adhesion laminating adhesive. Such progressive transformation to different types of adhesive is monitored and confirmed by the shift in viscoelastic window.

Keywords:

• Pressure-sensitive adhesives
• Optically clear
• UV-curable
• Viscoelastic window
• Transfer labels
• Liquid crystal display protective coatings

The authors thank Avery Dennison for permission to publish this work.