Enzyme resistance of ethyl hydroxyethyl cellulose (EHEC) was also compared with CELLOSIZE ER and conventional HEC in the same UCAR Acrylic 518-based paint. High Thickening Efficiency, Excellent Formulation Compatibility, and Available with Superior Enzyme Resistance Coatings High Thickening Efficiency, Excellent Formulation Compatibility, and Available with Superior Enzyme Resistance CELLOSIZE Hydroxyethyl Cellulose for Coatings Applications CELLOSIZE Hydroxyethyl Cellulose Continues to …

Table 1 Viscosity Ranges of Aqueous CELLOSIZE Hydroxyethyl Cellulose Solutions(1) Solution CELLOSIZE ViscositySpindleRPM Concentration % HEC Grade Range LVF Number Brookfield at 25°C, mPa•s QP-300 300-400 2 60 2 ER-4400 4800-6000 4 60 QP-4400H 4800-6000 4 60 1 QP-15000H 1100-1500 3 30 QP-30000H 1500-2400 3 30 QP-52000H 2400-3000 3 30 ER-15M 1100-1500 3 30 ER-30M 1500-1900 3 30 ER-37M 1900-2400 3 30 ER-52M 2400-3000 3 30 CELLOSIZE™ hydroxyethyl cellulose (HEC) has long been recognized as an outstanding thickener for both interior and exterior latex paints. The major advantages that CELLOSIZE HEC offers as a paint thickener are: •High Thickening Efficiency •Excellent Enzyme Resistance •Low Water Insolubles •Excellent Color Development and Color Acceptance •Compatibility with a Broad Range of Paint Ingredients •Batch-to-Batch Uniformity •Good Brush and Roller Application •Non-Sagging Properties CELLOSIZE HEC is a nonionic, water-soluble polymer that can thicken, suspend, bind, emulsify, form films, stabilize, disperse, retain water, or provide protective colloid action. It is readily soluble in hot or cold water and can be used to prepare solutions with a wide range of viscosities. It has outstanding tolerance for dissolved electrolytes. For latex paint thickening, CELLOSIZE hydroxyethyl cellulose (HEC) is offered in standard viscosity grades from QP-300 to QP-52000H. CELLOSIZE enzyme resistant (ER) HEC products are also available in five grades, which have been specifically developed to improve their resistance to enzyme attack. The popular grades for paint thickening are QP-4400H and QP-15000H. For economy, higher viscosity grades may be used. The amount required for proper viscosity may, however, be less than the amount needed for other properties. The higher viscosity thickeners are usually employed in low-cost paints and in industrial coatings where storage and application conditions are moderate. Table 1 shows the solution viscosities of the HEC grades that are useful for paint thickening. Table 2 shows typical properties of HEC grades. 2 (1) Grade designations containing the QP prefix represent quick dispersing products; grade designations containing the ER prefix represent enzyme resistant products. Table 2 Typical Properties of CELLOSIZE QP and ER Products Property QP-Grade ER-Grade Bulk Density, lbs/ft3 (kg/m3) 25-38 (400-600) 32-44 (500-700) Bulking Value, gal/lb 0.087 0.090 Weight, lbs/gal (kg/L) 11.4 (1.37) 11.1 (1.33) Color Cream to whiteCream to white Particle Size, % through U.S. 20 Mesh98 minimum 98 minimum Specific Gravity at 20/20°C 1.36-1.38 1.32-1.34 Volatile Matter, % by Weight 5 maximum 5 maximum Properties and Advantages CELLOSIZE HEC is manufactured in a variety of viscosity grades. These versions differ principally in their aqueous solution viscosities and are offered to optimize performance in specific CELLOSIZE HEC applications.

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