Wollastonites in Wall Paints: Summary
Replacement of typical Fillers like CaCO3 by Wollastonites E7632
in waterborne emulsion paints:
• leads to significantly improved microbial stability
even at a formulation pH of around 9
• Makes it possible to reduce biocide level below labelling threshold
• Enables a formulation without the need of additional neutralizing agent
Efficient microbial stability is only achieved if
• a significant amount of Wollastonite (20%) is used
• Specially engineered grades like Wollastonite E 7632 are used
Additionally the use of Wollastonites improves paint quality (wet srub, opacity etc.