Dispex CX4240 is a derivative of a family of highly effective, lowviscos-ity dispersing agents for water-based coating systems, especially suit-able for the dispersion of inorganic pigments.
ompared with other dispersing agents Dispex CX4240 allows formula-tions of high-gloss/low-pigment-volume-concentration coatings in addition to standard matt formulations.
Dispex CX4240 is part of a family of products based on an acrylic co-polymer. The copolymer is manufactured to a relatively narrow mo-lecular weight distribution, resulting in a consistent product
quality with maximum effectiveness.
typical properties
(no supply specification) solvent water
density at 20 °C (68 °F) ~ 1.20 g/cm3
solid content ~ 40 %
active content ~ 39 %
viscosity at 20 °C (68 °F) ~ 400 mPa's
pH 7.5
Although Dispex CX4240 is freeze-stable it should be stored at temperatures above 5 °C (41 °F) to allow easy handling.
DispexCX4240 is an ideal dispersing agent for a wide range of water-based coatings. The special copolymer backbone is designed for complete compatibility with polypropylene and hexylene glycols used in high proportions in water-based high-gloss coatings to promote wet-edge time.
The use of Dispex CX4240 is especially recommended when high-gloss/low-pigment-volume-concentration coatings are formulated.The neutralizing alkali used in conjunction with the acrylic polymer can significantly impact the properties of the final coating. Dispex CX4240 releases ammonia during the drying process and therefore has little impact on the resistances to water and alkali of the dry film.
The use of Dispex CX4240 should be limited to pH 5 – 10.5 and temperatures lower than 70 °C (158 °F) due to potential loss of volatile ammonia.