Beyond DPHA: Dendritic Oligomers in UV Flexographic Systems

DPHA (dipentaerythritol hexaacrylate) is a well-established component in UV flexographic systems, valued for its high functionality and rapid cure response. However, its use - particularly in food packaging applications - has drawn increased attention due to evolving regulatory requirements. As the industry begins to consider alternatives, the challenge lies in identifying materials that deliver comparable performance without compromising formulation goals.

In response, Bomar conducted a comprehensive study to evaluate dendritic oligomers as high-performance, regulatory-conscious replacements for DPHA in UV flexographic systems.

Why Dendritic Oligomers?

Dendritic oligomers are hyper-branched thioether urethane acrylates with acrylate functionality of six or more. Their unique architecture results in:

• High functional group density for greater crosslinking potential
• Improved formulation flexibility across a wide range of resin systems
• Enhanced performance in key properties like durability, adhesion, and cure speed

These attributes make dendritic oligomers strong candidates for use in flexographic inks and coatings.

About the Study

Bomar’s study, Dendritic Oligomers for UV Flexographic Systems, evaluated the performance of multiple dendritic oligomers through rigorous testing—including physical, chemical, and photo-rheological analysis. The goal: to determine whether these materials could match or exceed the capabilities of DPHA in flexographic applications.