The traditional glycol based colorants are more and more replaced by glycol-free colorant systems. Elementis Specialties developed sofar 3 generations glycol-free colorant systems:
First generation: TINT-AYD WCH
This line of glycol-free colorants were introduced in 2000 and are universal (for water-based and solvent-based decorative coatings) and based on poly-ethylene-glycol. These colorants are volumetrically controlled and a P.O.S. (point-of-sale / in-shop) tinting system is formulated with these colorants.
Meanwhile, this colorant line is succeeded by the second and third generation VOC compliant systems.
Second generation: TINT-AYD WCH Plus (P.O.S tinting) & TINT-AYD IPC (In-plant tinting)
Colorants from these series are glycol-free, APEO-free colorants and universal as well but also poly-ethylene-glycol free. These lines were introduced to the market in 2004. An inhouse developed hydrophylic humectant is used in these colorants series. The use of a humectant instead of poly-glycols lifts the tinted paint properties to a higher level. Particularly in solvent-based decorative paints often better gloss retention is found compared to poly-ethylene-glycol based colorants. The use of a hydrophylic humectant ensures excellent open times as well: no clogging in nozzles of tinting machines, no pumpability problems and extreme stable colorants.
Third generation: TINT-AYD AQ HC (In-plant tinting) and AQ (P.O.S. tinting)
Elementis Specialties' third generation glycol-free, VOC compliant architectural colorants were formulated in 2009 to address the current growing interest in dedicated colorants for aqueous coatings only. This third generation is based on a dual humectant system and is recommended specifically for water based coatings. A combination of a hydrophylic and a hydrophobic humectant is used. This humectant package, combined with a water-dedicated surfactant package result in optimum paint properties of tinted aqueous paints: viscosity drop in tinted paints and water sensitivity influences are minimized and overall compatibility in water based systems is optimized.