RadTech UV/EB Technology Conference & Expo 2008
May 4-7, 2008
Lakeside Center at McCormick Place
Chicago, Illinois - United States of America

FORMULATION OF COATINGS

Dominant Factors of Gloss Control in Radiation Curable Coatings
Suresh K. Devisetti, Congoleum Corporation
Abstract: Gloss control is an important and complex process in radiation curable coatings. Prior work on gloss control extensively reviews various key parameters that affect the matting of UV coatings but is not always clear or detailed enough in identifying the dominant factors over less significant variables. The current work investigates various process conditions and formulation parameters that influence gloss control in order to prioritize the key parameters. Parameters studied include UV energy dose, irradiance, curing temperature, photo initiator level and functionality. These experimental findings are interpreted in the context of a dual-environment (air and inert) curing mechanism to provide a better framework for gloss control.

Making UV coatings smoother and adhere better
Jos S. de Wit, Eastman Chemical Company
Abstract: Adhesion of UV curable coatings on polyolefinic substrates such as packaging films or automotive trim is often very challenging. Reasons include instantaneous curing with significant shrinking and the combination of chemical inertness and low surface tension of the substrates and the rheology and surface tension of the acrylate coating. Chlorinated polyolefins have been used successfully to adhere UV coatings to such substrates. Cellulose esters reduce shrinkage and provide a rheology that allow acrylate coatings to flow and level and also improve adhesion.

Novel Reactive Pigment Dispersants
Diana L. Hull, Lubrizol Advanced Materials
Abstract: With the continued strong growth in uv systems around the world, the need to improve overall physical properties of highly pigmented systems is becoming critical. Areas to improve include film hardness, chemical resistance and speed of cure. This study compares the use of reactive pigment dispersants, which can crosslink into the binder matrix, versus conventional non-reactive dispersants and their effect on the physical properties of cured coatings from model paint and ink formulations.

Optimization of Photopolymer Formulations from High-Throughput Analysis
and Modeling
Christopher N. Bowman, University of Colorado at Boulder
Abstract: Optimization of monomer formulations was performed using a multi-component photopolymerization model and high-throughput analysis techniques. High-throughput conversion analysis was employed to determine kinetic parameters for multiple acrylates. These kinetic parameters were applied in a multi-component photopolymerization model to predict conversion and relevant polymer properties for all potential ternary acrylate formulations and exposure times. The resulting data is then utilized to discover potential formulations with the required polymer properties or production costs for experimental analysis.

UV Curable Upjacketed Optical Fiber Coatings with High Productivity
and Superior Strip Performance
Kelly Hawkinson, DSM Desotech, Inc.
Abstract: As the demand for fiber to the premise continues, there is a need for increased design flexibility and productivity in optical fiber cables. New types of materials that can meet such requirements are certain UV curable upjacketed coatings. The UV curable upjacketed coatings not only offer performance advantages over the traditional thermoplastic materials, including increased processing line speed by 2 - 4 times, easy accommodation to variations in outer diameter of the cable design, and increased fiber strip performance; but also they provide degrees of nonflammability while being halogen free. This allows for flexibility in cable designs to enhance performance and cost saving.

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