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Technical Congress Presentation Abstracts from Dow Coating Materials:
| Title and Author | Abstract Summary |
| LOW VOC GLOSS COATINGS - ADVANCES IN PAINT AND ENVIRONMENTAL PERFORMANCE Author: Anne KOLLER, Andrew TRAPANI, Marie BLEUZEN Presenter: Jean-Luc Blaise |
Despite tightening VOC regulations, solvent-borne alkyds remain popular in Europe due to certain key properties like extended open time, superb flow and levelling and high potential gloss. They have deficiencies however such as relatively poor durability, film yellowing and solvent odour as well as an unfavourable environmental health and safety profile. Here we present an alternative to solvent alkyds - a new technology platform featuring a waterborne acrylic hybrid polymer dispersion for low VOC decorative coatings. This technology is suitable for high gloss paints and delivers significant improvements in flow and leveling and open time. These improvements are achieved through the choice of the polymer design of the hybrid and an alkyd like rheology. The new dispersion maintains the desirable dry film properties of pure acrylic systems, notably little or no yellowing and does not require the use of cobalt driers to develop its dry film properties. |
| Advanced Technologies for the Formulation of Higher Performance Waterborne Masonry Coatings with Lower Environmental Impact. Author: Dr. Marie Bleuzen, Francine Signoret, Michel Lorenzo and Dr. Andrew Trapani Presenter: Jean-Luc Blaise |
Pure waterborne acrylic technology is known to provide superior exterior durability to coatings for different substrates. Today's formulating tools can further improve this performance and also lower the environmental impact of the paint. Film integrity and adhesion to the substrate are essential for a protective coating. An optimum distribution of organic and mineral phases in the film can be obtained by encapsulating individual pigment particles with latex particles. This Pigment Encapsulation Technology (PET) allows the formation of polymer-pigment composite particles. Masonry paints based on PET binders exhibit strong adhesion to mineral substrates resulting in an improved efflorescence resistance. Replacing part of the TiO2 with an Opacifying Polymer (OP) improves the dirt pick up resistance. The homogeneous, spherical, hydrophobic OP resists dirt pick-up and helps reduce mold and algae growth. Additionally an optimized combination of a PET binder with an OP leads to paints with an even more favorable lifecycle analysis. |
| Designed Diffusion: A paradigm shift in film formation Author: Zhenwen Fu, Andrew Hejl, Andrew Swartz and Andrew Trapani Presenter: Andrew Trapani |
In latex based coatings, volatile organic compounds (VOC) are used as coalescents to ensure film formation. It has become increasingly difficult to maintain hardness, block, print and dirt pick-up resistance in industrial coatings as formulators reduce VOCs to meet demanding environmental regulations. Traditional methods of Tg reduction – latex morphology control and hard-soft blends – have been unable to meet the needs of the industrial coatings formulator. In response, a new technology is presented that significantly improves the early property development of waterborne latex coatings while addressing the challenges of the low VOC formulation landscape. This new Designed Diffusion technology balances coatings properties through careful design of the polymer system and the selection of a coalescent package with unique partition coefficient and diffusion rate between different phases of the polymer system. This paper presents detailed evidence of this DESIGNED DIFFUSION technology with analytical, physical and application data. |