Typical Formulation Ingredients
Ingredient
Parts by weight
Monofunctional aliphatic urethane acrylate oligomer (Genomer 4188/EHA, Rahn USA Group)
Modified polyester resin (Genomer 6043/M22, Rahn USA Group)
Isobornyl acrylate (Genomer 1121, Rahn USA Group)
Aliphatic urethane acrylate (Genomer 1122, Rahn USA Group)
2-(2-Ethoxyethoxy) ethyl acrylate
Photoinitiator (Genocure LTM, Rahn Energy Company)
(Source: Formulation Goals of Energy Curable Pressure Sensitive Adhesives, Rahn USA Corporation, 2006)
Resulting Properties
This formulation offers nicely balanced pressure sensitive adhesive performance with exceptional adhesion. The Genomer 4188/EHA exhibits exceptional elongation properties (384%) and good cohesive strength. This balance of flexibility and cohesion coupled with excellent adhesion attributes produces high peel values in a laminating adhesive. An increase in the Genomer 4188/EHA will raise the adhesive’s T-Peel performance even higher. In addition, the combination of Genomer 1121 and the Genomer 1122 help to enhance both adhesion and strength in the laminating adhesive. The Genomer 1121 has a high Tg of +80ºC and can create hard strong products. Conversely, the Genomer 1122 has a Tg of -3ºC and is extremely flexible with good adhesion characteristics. When used in combination, the two monomers provided better T-Peel values than when used as the sole diluent as their respective contrasting properties are blended to create a well-balanced adhesive.