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

Highly Weather Resistant Radiation Curable Monomers and Oligomers
for Exterior Applications
William Schaeffer, Sartomer Company
Abstract: The weathering resistance of an exterior coating is one of the main properties required by the end-user. The backbone structure of several monomers and oligomers has been investigated and subjected to accelerated outdoor weathering testing (Q-Trac)and correlated with actual Florida exposure. The performance of these products has also been compared to a standard 2 component urethane intended automotive topcoat applications. The physical properties including yellowing resistance and gloss retention will be presented. This ongoing study has shown that these acrylates, which are free from light stabilizers, can withstand 3 years of Florida exposure without gegradation. Since the testing was conducted in accordance with automotive test standards, these products are suitable for any application requiring superior outdoor durability.

Modern use of vinyl ethers and vinyl amids in UV curable applications
Matthias Fies, BASF
Abstract: Over the last years vinyl ethers and vinyl amids are used in growing number of UV curable industrial applications. The usage of vinyl ethers and vinyl amids is up-dated. A performance comparison of vinyl ethers and vinyl amids with UV-acrylates in specific formulations emphasizes the unique properties of vinyl ethers/vinyl amids in UV-curing. For special applications in UV curable coatings and inks new vinyl ether and vinyl amids have been developed and are presented. Finally the performance of newly developed vinyl esters as reactive diluents are presented.

Photocured Imprintable Networks
Justin Chan , University of Southern Mississippi
Abstract: Coatings consisting of mixtures of multifunctional thiols and enes were exposed to UV light sources serve a efficient networks for molecular imprinting of small molecule. By rinsing these films in appropriate solvents, these networks efficiently scavenge small molecule impurities which are targeted by the network structure. The scavenging efficiency is shown to be dependent upon the chemical structures of the thiols and enes used to form the background network. Applications for UV curing in advanced imprintable networks are discussed.

Photopolymerizable hybrid sol-gel: new opportunities for UV-cured coatings
Céline Croutxé-Barghorn, Department of Photochemistry
Abstract: Photopolymerizable organic-inorganic sol-gel coatings combine numerous advantages: good adhesion to substrates, abrasion and chemical resistance. Owing to the possibility of controlling the inorganic network density, sol-gel films can also form an effective barrier layer. Crackability is limited by the presence of the organic component. The present paper focuses on the new opportunities opened by these materials in the UV-curing field in terms of photopolymerization process and final coatings properties.

Preparation and Properties of UV curable urethane modified acrylate oligomer
Fengqi Huang, Tianjin Tianjiao Chemical Co.,Ltd
Abstract: Preparation and Properties of UV curable urethane modified acrylate oligomer Fengqi Huang1 , Wenzhi Yu1, Jiaxi Wang1,2* 1. Tianjin Tianjiao Chemical Co.,Ltd, Tianjin 300400 2. Department of Polymer Science and Engineering, Hebei University of Technology, Tianjin 300130 Abstract: N,N-dihydroxyethyl acrylamide (DHEAA), which is an acrylate functionalized diol, has been prepared by reaction of diethylanol amine with methyl acrylate. UV curable urethane modified acrylate oligomers have been synthesized by the reaction of a series of diol, triol, DHEAA and HEMA with TDI or IPDI in two reaction orders. The one is the TDI or IPDI reacted with HEMA first to give acrylate group ending mono isocyanate, then the mixture reacted with diol or triol to generated urethane modified oligomer with two or three functional group acrylates. The other is the TDI or IPDI reacted with diol , triol or DHEAA first to give oligomer, then resulted solution reacted with HEMA to obtain the UV curable product with more functional groups. The average molecular weight, structure unit of oligomer and number of functional groups can be tuned by adjusting of adding order, ratio of starting material and the reaction condition. The UV curing property such as curing rate, hardness of cured film, impact strength, flexibility and so on have been determined. The relationship between the component and the properties of cured film has been discussed.

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