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

POSTER SESSION
Monday, May 5 & Tuesday, May 6 from 1:00 PM - 2:00 PM on the Show Floor

Dispersion of Functional Nanoparticles – Key to Application
Steffen Pilotek, Buhler Inc.
Abstract:  In real-world applications, nanoparticle composite technology should be compatible with existing (downstream-) processes like e.g., mixing, formulating, casting, coating, or molding. These requirements poised by the industrial realm make the successful dispersion process for nanoparticles the key element in nanoparticle processing.  Introduction of nanoparticles into a formulation results in a composition which is not merely a mixture but a microscopically homogeneous composite with respect to e.g. optical, mechanical, chemical, electrical, or magnetic properties. In contrast to nanoparticle powders, nanoparticles can be easily processed and introduced into product formulations when provided as a nanobatch, a nanoparticle dispersion that is compatible with the requirements of the respective downstream processes. Additional features and constraints given by the requirements of industrial applicability may include, e.g., viscosity, solid content, transparency, or surface roughness.  The nanobatch-approach to introduce nanoparticles into product formulations comprises a customized dispersion process that includes the components of functionalization of nanoparticles by surface modification as well as a customized procedure to disperse the modified particles into the formulation. Here, we present the surface modification of SiO2 nanoparticles with acrylic-groups and their introduction into acrylic-based formulations to give radiation curable nanoparticle composites. In addition, we discuss the scope of our approach.

UV-curable polyurethane dispersions
Daniel Haile, Croda, Inc.
Abstract:  The combination of polyurethane dispersions and radiation curable techniques has led to UV-curable polyurethane dispersions (UV-PUD).  The industry has welcomed the combination of the two techniques, for the lower chemical impact on health and environment. The more critical application conditions, like the removal of the water by a pre-drying step, are being seen as an important drawback.  Uniqema has countered this slow evaporation of water from the UV- PUD through its range of Priplast polyester polyols, which are based on its Pripol C36-dimerized fatty acids. The hydrophobic nature of the C36-dimerised fatty acid based polyols exhibit a remarkable effect on the evaporation of water, while maintaining flexibility. Furthermore the reduced number of ester bonds and the hydrophobicity make these polyols water resistant, while keeping outdoor stability.

Temporal Response in Radiometry
EIT Instrument Markets
Abstract:  Users of UV radiometers have been advised to consider sample rate when specifying a radiometer, but little information is available on what sample rate would be appropriate for which application.  Factors influencing this choice are the height of the lamp above the substrate, speed of the conveyor belt, shape of the reflector, and sometimes system line frequency powering the UV lamp.  This paper will present some real world signals collected form UV equipment and the analysis of their interaction with various radiometers in order to generate a set of sampling rate guidelines in different UV applications.

Surface Modified nano particles as  emulsifiers
Joachim venzmer, Goldschmidt Chemical Corporation
Abstract:  Surface modified silica nanoparticles for use as emulsifiers in UV acrylic/ acrylic siloxane systems.

Characteristics and Applications of UV Curable Liquid Isoprene Rubber
Kei Hirata, Isoprene Chemicals Production, Technology & Development Dept.  KURARAY CO., LTD
Abstract:  UV curable liquid isoprene rubber (UC-LIR) is commercialized by KURARAY CO., LTD. using its unique polymerization and polymer modification technology. UC-LIR contains methacryloyl groups in polyisoprene structure and it is cured by UV irradiation in the presence of photoinitiator. It gives UV-cured materials with remarkable flexibility compared with urethane acrylate or polybutadiene acrylate. Pressure sensitive adhesives (PSAs) using UC-LIR indicates distinguished cohesion at high temperature and excellent adhesiveness. UC-LIR is expected to be applied for adhesives for electronic equipment and sealant for display as well as PSAs from its unique properties. And we also developed epoxidized liquid isoprene rubber which is curable by UV cationic polymerization.

UV Cured Silicones Hard Coatings - Performance in Head Lenses
Steven Mordhorst or Rob Hayes, Momentive Performance Materials
Abstract:  The driver for using coated head lenses in the automotive industry has diversified from productivity and functionality to benefit delivery, such as scratch resistance and long-term weatherability. UV curable hard coatings can offer a "looks like new" aspect to lenses and design flexibility that appeals to consumers. This Momentive paper details the performance of UV curable hard coatings to assist OEMs in selecting the most appropriate coating to provide excellent end product performance for consumers.

UV Cured Silicones Hard Coatings & Their Application in Plastics Substrates
Sona Slocum, Momentive Performance Materials
Abstract:  The driver for use of coated plastic parts has quickly diversified from functional imperatives, like weight reduction, to a focus on delivery of benefits that range from scratch resistance to weatherability and to imparting a luxurious look to finished goods and leveraging adhesion to parts that require subsequent treatments. This paper details the differences in performance among several UV curable hard coatings to assist customers in selecting the most appropriate coating for their particular applications.

New Developments in UV-Radiation Curing  Composite Materials and Nanocomposites as Protective Coatings
K.ZAHOUILY & C. DECKER, Photon & Polymers
Abstract:  Composite materials made of either epoxy resin reinforced with glass fibre or clay/ acrylate resin have been produced rapidly at ambient temperature by simple exposure to UV radiation. This UV-curing technology clearly outperforms traditional thermal processing with respect to output, cost, product quality and environmental impact.  Light-induced polymerisation of multifunctional monomers , is commonly recognised as the most effective process to transform a solvent-free liquid resin into a highly resistant polymer material rapidly at ambient temperature. Under intense illumination, the crosslinking reaction proceeds extensively at ambient temperature to generate a dense, three-dimensional polymer network showing excellent resistance to organic solvents, chemicals and heat. Because of its distinct advantages regarding processing and product performance, this environment-friendly technology has found a wide range of industrial applications, in particular to achieve fast drying of varnishes and printing inks, and quick setting of adhesives and composite materials. The viscoelastic and mechanical properties of the UV-cured polymer can be finely controlled through the chemical structure and functionality of the monomer used, and by the curing conditions as well, depending on the application considered. In this study the viscoelastic properties of the UV-cured material, monitored by dynamic thermal mechanical analysis, were found to be  superior to those of the thermally cure epoxy, with a significant increase of the elastic modulus and of the glass transition temperature. This technology was found to be very effective to produce nanocomposite materials or coatings based on acrylic resins and silica nanoparticles or Carbon nanotubes, which exhibit an excellent resistance to scratching and abrasion. The short processing time and the low energy consumption make the UV-curing technology particularly attractive in terms of cost, compared to the conventional thermal curing process.

History and Technology of Photopolymer Printing Plates
Manilal Savla, Savla Associates
Abstract:  The first synthetic photopolymers for imaging applications were developed in the laboratories of Eastman Kodak and DuPont in late 1940s and early 1950s.  The companies came out with lithographic and letterpress photopolymer printing plate products respectively. DuPont and other companies then introduced flexographic plates.  Other pioneering companies included Time, Inc., W. R. Grace, BASF, Nippon Paint, Asahi Chemical, Hercules, Uniroyal, Toray, TOK, Toyobo and Polychrome.    Chronology of events, important US Patents, mergers & acquisitions and technology will be discussed.  Photopolymer bases used in printing plates include acrylics, polyvinyl cinnamate, nylons, styrenic block copolymers etc.    (I have followed the photopolymet markets for more than 30 years)

Photopolymerization of functionalized lyotropic liquid crystalline systems
Lucas Sievens-Figueroa, University of Iowa
Abstract:  Recently, lyotropic liquid crystalline (LLC) systems have generated significant interest for the creation of new organic nanomaterials. Applications ranging from catalysis, chemical protection suits, and membranes have been proposed and investigated.  Photopolymerizable versions of LLCs could enable the creation of new nanostructured polymeric materials.  By relating the polymerization kinetics with the LLC structure before and after polymerization, a model for structure evolution and retention is proposed.  LLC phase order, stability, and crosslinking are all important variables affecting the structure evolution of these materials.

Characterization of Telechelic Polyacrylates Using Thermal and Thermomechanical Analyses
Wilson Mainye , University of Houston-Downtown
Abstract: Novel oligomers produced by Kaneka Corporation have been evaluated in the Center for Applied Polymer Science Research (CAPSR) laboratory for their thermal and thermomechanical properties. These oligomers are high purity telechelic polyacrylates that are UV-polymerizable. They have unique properties that result from a highly controlled production process. Samples of polymer films were prepared and tested using dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). DMA methodology allows one to determine several different thermomechanical properties including the glass transition temperature (Tg) as well as both storage and loss moduli. TGA techniques provide information about the resistance of materials to temperature increases and DSC is an alternative method for determining Tgs. Results of this study are interpreted with respect to the relative molecular mass of the two oligomers and the conditions under which they were polymerized.

Radiation Curable Dielectric Materials
Wenguang Li, DSM Desotech
Abstract: UV-curable coatings were investigated as dielectric materials for electrical conductors. The coatings have good adhesion on metals, and they passed the oil soak test at 150oC. The coatings have a dielectric constant lower than 3, a dielectric dissipation factor lower than 0.05 at 25 oC, and a breakdown strength higher than 1 MV/m.

Utilization of Chemically Modified Soybean Oil (CMSO) in UV/EB Curable Inks and Coating
Jean Lavelle & Dr. John Barkanic, Coating and Ink Research Institute, Northampton Community College

Correlation of Accelerated Weathering, Natural Weathering, and Florida Field Lenses for Protective Coatings in Automotive Forward Lighting
Sona Slocum, Momentive Performance Materials

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