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Christopher J. Karwowski - 2nd Generation Nano Technology Brings Waterborne UV Absorbers and Light Stabilizers that withstand Acid Rain Degradation

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Christopher J. Karwowski - 2nd Generation Nano Technology Brings Waterborne UV Absorbers and Light Stabilizers that withstand Acid Rain Degradation


Christopher J. Karwowski
Vice President Managing Director
Chitec Technology Co. Ltd.

Website: www.chitec.com

Authors: Chris Chiu

Co-Author: Christopher Karwowski




Waterborne ultraviolet (UV) stabilizers have gained popularity over the years as more and more solventbased exterior coatings have been converted to waterborne systems.  Basically, there are three types of waterborne UV stabilizers: water-miscible, emulsified, and water-soluble. The first two are the most popular because the water-soluble version is suspected to be washed away by rainfall.

Recently, the emulsified version has attracted more attention due to its extra low or zero volatile organic compound (VOC) content when compared with the water-miscible product, which requires significant amount of co-solvents as a diluent.  In addition, preparing a homogenized solution via emulsification takes much less effort than synthesizing a water-miscible product with co-solvents.

However, transforming liquid and small molecule hydrophobic UV stabilizers into a stable emulsified form that is suitable for long-term storage and transportation, is not as easy as it looks. This fact is supported by the fact that are a very limited number of manufacturers who supply emulsified UV stabilizers, each owning its proprietary technologies.  To be able to manufacture a light stabilizer package that withstands acid rain is even remarkable in today’s low pH rain environment throughout the world.

Regardless of technologies, large amounts of emulsifiers or other agents have to be used to stabilize the emulsion. These non-active components can comprise half and/or up to the same amount of the active components. These excessive non-active components may interfere with the other emulsifier systems in the coatings, or may trigger severe foaming issues while aggressive agitation and vacuum drying are applied during the process. Chitec has recently developed a novel emulsified UV stabilizer package that is able to reduce the emulsifier level to as low as 1/10 of the active ingredients without sacrificing the stability of the emulsified system. In addition, the foaming issue is also greatly reduced, and no biocide is needed for storage as they are produced in a clean room system.  Lastly, these products withstand testing that simulates acid rain with a pH as low as 4 with no significant loss of absorbance.  These advantages and some applications will be illustrated herein.



Christopher J. Karwowski is currently the Vice President and Managing Director for Chitec Technology Co. Ltd with responsibilities for North America and Latin America. Prior to his career with Chitec Technology Christopher was a Key Account Manager for FP-Pigments.

Christopher was employed as a Sr. Purchasing Manager for The Sherwin Williams Company for I 1 years. Prior to joining SW Christopher was the Global Key Account Executive for Ciba Specialty Chemicals with his global key accounts responsibilities being Pigments and High-Performance UVA's, Light Stabilizers, Anti-Oxidants and Photo Initiators for the coatings industry.

Christopher started his career as a process engineer at PPG Industries and has worked with pigments, additives, and resins his entire career. Christopher has earned a BS, BA and EMBA at Baldwin Wallace University. Christopher has been President and Chairman of the Cleveland Paint and Coatings Association and had the same role and responsibilities with the Cleveland Coatings Society. Christopher has been active in the Detroit Color Council and the American Coatings Association in regards to legislation and regulatory for Conflict Minerals.

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