The demand for low-viscosity, high-functionality, 100 percent solids, ultraviolet- (UV) cure coatings has led to the development of a new class of oligomers based on acrylated allophanate chemistry. This new class of acrylated allophanate oligomers offers UV coatings formulators the ability to minimize the amount of acrylated monomer and maximize the performance of the system.
Attendees of Photopolymerization Fundamentals 2011 this week will have the opportunity to listen to Mike Dvorchak, a UV-cure coatings expert with Bayer MaterialScience LLC, discuss this new group of oligomers. Dvorchak will present "New 100% Solids Acrylated Allophanate Oligomers Offer Low Viscosity and High Functionality While Maximizing UV Coatings System Performance." His presentation is based on a paper of the same title co-authored by Bayer MaterialScience's Dr. Abdullah Ekin, senior associate scientist, and Charles Gambino, R&D specialist. The presentation will be part of the "Hybrid Organic-Inorganic Polymerizations and Novel Concepts in Photopolymerizations" session.
In his presentation, Dvorchak will explain how the use of allophanate polyisocyanate chemistry allows for the production of low-viscosity resins, resulting in higher solids formulations in UV-cure coatings. Low viscosity resins are an environmentally friendly coating option, since they may not require the addition of reactive diluents or organic solvents. Dvorchak will also discuss how to optimize acrylated allophanate products, their use in plastic and direct-to-metal applications, and their outdoor stability.
"Allophanate polyisocyanates have a variety of desirable qualities, making them an appropriate choice for today's coatings formulators," says Dvorchak. "Specifically, allophanate polyisocyanates possess low viscosity, which allows for greater freedom when designing high-solid systems." As metal coatings, allophanates demonstrate good adhesion properties. He also found their outdoor stability to be comparable to isocyanurate-based UV oligomers.
Photopolymerization Fundamentals 2011 is sponsored by RadTech International and Colorado Photopolymer Solutions.