Tertiary Amine UV-Curable Adhesive for Optical Laminates

The patent changes the chemical composition parameters of the adhesive by incorporating a tertiary amine compound (specifically a polyalkylene glycol derivative with amino groups) alongside the photoinitiator. This compositional parameter change enables the adhesive to cure through both UV irradiation and thermal activation, allowing sufficient curing in UV impermeable regions while maintaining proper curing in UV permeable regions, thereby achieving reliable adhesive strength across the entire optical layer.

The tertiary amine compound acts as a chemical intermediary that enables dual-curing mechanisms. It absorbs UV energy to initiate radical polymerization in UV permeable regions, and simultaneously undergoes thermal polymerization in UV impermeable regions when exposed to heat from the UV lamp or ambient conditions. This intermediary substance allows the adhesive to cure completely without requiring excessive external heating that could damage the substrate, as the tertiary amine itself generates the necessary thermal reaction locally.

The adhesive composition is designed with multi-functionality to respond to multiple energy inputs. The photoinitiator component handles UV curing for UV permeable regions, while the tertiary amine compound component handles thermal curing for UV impermeable regions. This universal formulation ensures that the entire adhesive layer, regardless of its position relative to UV impermeable regions, achieves complete curing through the combined action of both curing mechanisms, maximizing the effective cured area.