Energy savings plus mechanical reinforcement and rheology control

Low Cost UV Curable Laminating Adhesive

Adhesives Formulation

Applicable Type

UV/EB Cure Adhesives

Applicable Base Polymer

Acrylates

Applicable Industrial Sectors

Flexible packaging: films / films & film / foil laminates

Applicable Base Polymer Properties

Ultraviolet light (UV) curing dry-type (non-tacky) laminating adhesives are creating significant interest for flexible packaging and films. Acrylate / methacrylate monomers and oligomers as well as photoinitiators are essential components of UV adhesives. Epoxy acrylates are commonly used in laminations since they have good adhesion to most films and are non-yellowing. These adhesives are also characterized by a relatively low application viscosity.

Typical Formulation Ingredients

Ingredient

Parts by weight

Epoxy acrylate (Genomer 2252/TM20, Rahn Energy Company)

xxxx

Trimethylolpropane triacetate, TMPTA

xxx

Tripropylene glycol diacrylate, TPGDA

xxxx

Carboxyfunctional polyester acrylate (Genomer 7151, Rahn Energy Company)

xxxx

Adhesion promoter (Genorad 40, Rahn Energy Company)

xxx

Dimethylhydroxyacetophenone (Genocure DMHA, Rahn Energy Company)

xxx

(Source: Des Roches, S. and Jaramillo-Tran, E., “A Formulator’s Guide to Energy Curable Laminating Adhesives” RADLAB USA (Part of the Rahn Group)

Typical Properties

Properties

Viscosity, cps

xxx

T-peel tests on OPP/OPP, PE/Paper, OPP/Paper, PE/Al foil, OPP/Met OPP, PET/Paper, PET/Al foil, PET/PET

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Processing

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Resulting Properties

In this adhesive formulation, the adhesion is supplied by the Genomer 7151 and the Genorad 40. These products bite into the substrates enough to create a strong adhesive bond. The cohesion is a result of the Genomer 2252/TM20 and the trimethylolpropane triacrylate, which offer a good amount of crosslink density in the adhesive. This blend of properties resulted in substrate failure for many tested substrate combinations. Increasing these two products will improve the adhesion performance even more.

Low Cost UV Curable Laminating Adhesive

Applicable Base Polymer Properties

Typical Formulation Ingredients

Typical Properties

Processing

Resulting Properties

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