Viscosity reducers results achieved

The viscosity achieved by the CGTase at pH 4.5 is very similar to the viscosities produced by Termamyl at pH 6.2 and B, stearothermophUus pha-amylase at pH 5.8 as measured at a drive speed of 32 (Table II). Reducing the CGTase dose to 2.23 Phad as units still yielded acceptable viscosity. These results establish that the CGTase can liquefy starch under simulated industrial conditions of high stardi but at a pH i.e., 4.5 where conventional alpha-amylases do not function. 

Results for the three pigments tested show some differences with respect to pigment loading and millbase viscosity. Clearly Dispersant B shows poorer performance in this formulation and the pigment loading would have to be reduced to achieve a similar result to A, C and D dispersants. Dispersant A also shows mixed performance, especially on Raven 5000U2 whilst Dispersants C and D are better matched. 

Particle interactions resulting in aggregates of particles will adversely affect dispersion. Special surface treatments are provided to reduce these aggregation forces and achieve higher loadings and better suspension stability with less effect on viscosity. These surface treatments can be applied directly to the filler, and many grades of treated fillers are commercially available. 

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