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Thursday, 19 September 2019
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Raw materials & technologies, Raw materials, Coatings additives

Coatings additives: dispersants to deliver brightness and brilliance

Friday, 12 April 2013

New dispersing agents for waterborne pigments offer high pigment loading, enabling bright and brilliant architectural coatings.

The new dispersing agents have been developed for waterborne pigment preparations
Source: Rossler / Fotolia

The new dispersing agents have been developed for waterborne pigment preparations
Source: Rossler / Fotolia

A new range of dispersing agents for waterborne pigment preparations has been launched by Clariant. Aimed at organic pigments and carbon blacks, the new dispersants give architectural coatings extra brightness and brilliance, thanks to their high pigment loading.

According to the manufacturer, the patented copolymers are able to create dispersions with more than 50 % pigment, significantly more than conventional loadings. And the new range ("Dispersogen PL”) does this without sacrificing flowability. Viscosities of its pigment dispersions are within the range of 50-500 mPA•s. Similarly loaded conventional pigment preparations, by contrast, turn often to a much higher viscosity.

Good shelf life and drying stability
"High pigment-loads also means that the new range does more for less. Its typical mixing ratio is 1:10 up to 1:5 dispersant based on active matter to pigment, and customer trials over the past two years have shown that the pigment pastes have a very good shelf life, stable against drying and very compatible with all kind of waterborne coatings,” says Hendrik Ahrens, Technical Application Specialist in Clariant’s Industrial & Consumer Specialties Business Unit. 
"Dispersogen PL 30” and "Dispersogen PL 40” additionally are safe to humans and the environment. The former as a nonionic copolymer and the latter as an anionic copolymer have a friendly ecotox profile and contain insignificant levels of irritants and other hazards that might require a coating to bear a CLP label. Additionally these two dispersants have a low VOC level and are suitable to be used in decorative paints aiming to obtain ecolabel certification such as Germany’s Blue Angel (RAL-UZ 102).

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