Paint & Coatings Industry - May 2008 - (Page 58)

The Development of New SMA Esters as Pigment Dispersants for Waterborne Coatings and Inks TABLE 7 | Phthalo blue dispersions – tint strengths. Sample SAR 101705-1 SAR 101705-2 SAR 101705-3 SAR 101705-4 SAR 101705-5 SAR 101705-6 SAR 101705-7 SAR 101705-8 SAR 101705-9 Resin NTX 7633 NTX 7634 NTX 7635 NTX 7636 NTX 7637 NTX 7638 NTX 7639 NTX 7643 SMA Ester B Optical Density 0.830 0.830 0.850 0.850 0.856 0.850 0.823 0.830 0.816 Reflectance 0.1479 0.1479 0.1413 0.1413 0.1393 0.1413 0.1503 0.1479 0.1528 Tint Strength 104.46 104.46 111.10 111.10 113.15 111.10 102.21 104.46 100.00 NA* the weight loss. The values for four of the new esters are compared with those for SMA Ester A and B in Table 3. As can be seen the VOC of new ester NTX 7639 is lower than that of Ester A, but slightly higher than that of Ester B. Dispersion Procedure The new SMA esters were evaluated versus SMA Ester A and SMA Ester B. Phthalo blue and lithol rubine dispersions were made at fairly robust pigment loadings: 38.75% for the phthalo blue, and 37% for the lithol rubine. The properties of primary interest were dispersion and ink viscosities, color development, color density and drawdown appearance on Leneta charts. All of the SMA esters were used to make both phthalo blue and lithol rubine dispersions. From this screening, the best performing esters were selected and these were further used to make the diarylide yellow dispersions. Dispersions were made using the SMA esters as the sole dispersing resin. The formulas were prepared at 4.75/1 pigment-to-binder ratio. The method of incorporation involved weighing SAR 101705-10 SMA Ester A * This dispersion was too thick to process through the mill. Formula No. SAR 101705-9 SAR 101705-2 SAR 101705-3 SAR 101705-5 SAR 101705-7 SAR 101705-8 SMA Ester SMA Ester B NTX 7634 NTX 7635 NTX 7637 NTX 7639 NTX 7643 Viscosity @ 12 rpm 7100 4320 7200 10460 3100 2960 Dispersions containing SMA Ester A, NTX 7636, and NTX 7638 were too viscous to be measured. Doing What We Do Best Reaxis manufactures and supplies a broad and extensive selection of metal-and-acid based catalyst chemistries used in the processing and production of a number of key products, including: • Polymers • Elastomers • Plastics • Adhesives and Sealants • Oleochemicals • Coatings Our product expertise, R&D capabilities, technical service and attention to customer service has enabled us to create high quality, valueadded products and solutions for our customers that work effectively in many unique,essential applications. For information please call 1-800-426-7273 or visit us at www.reaxis.com. We have renamed our well-known TEGOKAT® product line REAXIS™. Visit ads.pcimag.com 58 MAY 2008 | W W W . P C I M A G . C O M http://www.reaxis.com http://www.reaxis.com http://ads.pcimag.com http://WWW.PCIMAG.COM

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

Paint & Coatings Industry - May 2008 Contents Viewpoint Industry News Calendar of Events Company News Mergers and Acquisitions Names in the News Charlotte Dining Guide Exhibits-in-Print Waterborne Alkyds Break Through the Performance Barrier New Matting Agents for Waterborne Coatings and Varnishes Silicon-Based Technology for the Coatings Industry High-Performance Microgrinding The Development of New SMA Esters as Pigment Dispersants for Waterborne Coatings and Inks The Right Choice New Coating Technology Expands Color Choices for Vinyl Building Products BioPreferred Federal Biobased Products-Preferred Procurement Program European Union's REACH Regulation Sustainability - The New Nano Improved Dirt Pickup Resistance Critical to Future Coating Innovation NanoNews Protective Coatings NDT - Energy-Saving Paint Static Electricity - The Hidden Danger in Hazardous Areas Wacker Chemie - A Profile of Success Materials Watch Products and Literature Classifieds Advertiser Index

Paint & Coatings Industry - May 2008

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.