CRAYVALLAC® ULTRA

Micronised Amide Wax Rheology Modifier

Product Benefits

CRAYVALLAC® ULTRA is a new high performance micronised amide wax rheology modifier offering very good recoatability for ambient curing solvent-based epoxy coatings.

CRAYVALLAC® ULTRA has been designed to overcome those difficulties which exist with older type organo-wax rheology modifiers e.g. seeding, false-body and migration of readily dissolved species to the surface. Consequently, when used in strong solvent systems, coatings formulated using CRAYVALLAC® ULTRA offer an enhanced performance and very good recoatability.

The use of high-speed dispersers is ideal for the incorporation and activation of CRAYVALLAC® ULTRA in that they develop both the necessary level of shear and temperature.

CRAYVALLAC® ULTRA is best added along with the initial charge of resin during the pigment dispersion and grind stage. Efficient activation will be achieved by allowing the temperature during dispersion to rise to 45 - 65°C (113 - 149°F), but more preferably from 55 - 65°C (131 -149°F), and maintaining this condition of dispersion and temperature for 20 - 30 minutes.

The activation process constitutes the conversion of the CRAYVALLAC® ULTRA particles to an interacting network of fibre-like particles. It is this network that gives rise to the final coating’s shear thinning rheology. This shear thinning characteristic provides a very high viscosity under the low shear rates associated with

sedimentation, and a low viscosity at the much higher application shear rates. The net result is excellent control of sedimentation combined with ease of application.

Immediately following application, where low shear conditions again predominate,the coating’s viscosity undergoes a time dependent recovery as the network reestablishes itself. This time dependence is known as thixotropy and enables the final coating to attain very good levelling and sag resistance.

Performance Benefits

·100% Active

·Imparts shear thinning rheology with thixotropic viscosity recovery

·Very good recoatability

·Excellent sag resistance

·Very good anti-settling properties

·Good storage stability

Recommendations for Use

Anti-Settle and Sag Resistance                       0.5 – 1.5%

Sales Specifications
Particle size distribution: (Malvern Mastersizer S laser Particle size analyser) (CR005)
                             DV. 1 min.                                                  1.8 μm
                             DV. 9 max                                                  15.0 μm
Other Properties

                             Density at 25°C (77°F), g/cm3 (CR006)      0.98

                             Bulk density, g/cm3 (CR016)                      0.4-0.6

                             Appearance                                                White Powder

Other Properties

                             Capillary Melting Point (CR003)                121°C (250°F)