Currently VOC legislation does not count the colorant as part of the VOC calculation for point of sale paints (POS), although it is considered for in-plant applications. However, proposed changes in legislation are to include the VOC contribution made by the colorant at POS. This paper discusses the impact of novel no-VOC colorants in waterborne coatings.A number of raw materials were screened to develop new colorants. High molecular weight anionic and non-ionic polymeric surfactants with HLB between 7 and 15 and minimal VOC were considered. Promising results were observed with surfactants based on alkoxylate polymers containing large polycyclic aromatic anchor groups, aqueous solution of high molecular weight block copolymers and an aqueous solution of modified copolymer with pigment affinity groups. Specific structures were not disclosed in this paper.
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