Paint & Coatings Industry - March 2008 - (Page 44)

A Unique Fungicide for Wood-Filled Plastic he agrichemical, folpet, is shown to be an effective fungicide for use in a broad range of plastics including wood-filled plastics. Performance is evaluated through a tiered product development program utilizing: 1) Petri dish and environmental chamber accelerated laboratory testing of weathered samples and 2) the exterior exposure of panels or full-scale constructs (e.g., test decks). The action mechanism of folpet, a trichloroFigure 1 | Trichloromethylthiophthalimide (folpet) molecule. T methylthio-adduct, N-(trichloromethylthio)phthalimide, is discussed herein. The folpet active ingredient is additionally compounded into several physical forms that include resin and lubricant-pellet concentrates and granules for ease of processing into plastics and wood-filled plastic composites based on polyolefins, PVC and other resins. Data are presented that demonstrate protection from microbial defacement and deterioration at use-levels of 0.3 – 0.5% and treatment costs of cents per board-foot of composite without significant impact on physical properties. In addition, thermostability data for folpet and flexural properties of the finished wood plastic composite are presented. Air monitoring during extrusion operations shows that folpet-based products are easily handled safely in the work environment. A manufacturing case study is also presented. Introduction Folpet belongs to the trichloromethylsulfenyl class of fungicides originally discovered to be effective agrichemicals for the protection of crops, particularly soft fruits, from the growth of plant pathogenic fungi. Folpet is commonly used on hops, avocadoes and grapes. The molecular structure is shown in Figure 1. The folpet mode of action has been investigated primarily from the viewpoint of the plant pathologist.1-3 Investigations have centered on the mechanism(s) involved in the prevention of the growth of microorganisms that are harmful to plants. Many of these same microbes colonize architectural coatings and stains and flexible PVC plastics; subsequently, trichloromethylsulfenyl pesticides, in particular, folpet, have been found effective as industrial biocides for materials protection. Initial mode-of-action studies led to the discovery that trichloromethylsulfenyl fungicides (such as fol- Figure 2 | Iodopropynylbutylcarbamate (IPBC) molecule. By Dr. William B. Woods | International Specialty Products, Wayne, NJ 44 MARCH 2008 | W W W . P C I M A G . C O M http://WWW.PCIMAG.COM

Table of Contents Feed for the Digital Edition of Paint & Coatings Industry - March 2008

Viewpoint Industry News Calendar of Events Company News Mergers and Acquisitions Names in the News Marketplace Quarterly Stock Watch Reaching Strict VOC Requirements With Outstanding Durability for Industrial Maintenance and Marine Coatings A Unique Fungicide for Wood-Filled Plastic deSigns of the Times: Slacking Off! From Rocks to Nanos Shear-Free Dispersion Process Fluorinated Oxetane Oligomers as Versatile Intermediates for Polymer Modification The Effects of TPO Composition on Adhesion and Proposed Chemical Mechanism Supplier Showcase Color Management Materials Watch Products Classifieds Advertiser Index

Paint & Coatings Industry - March 2008

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