What is a Coalescing Agent?
About Citroflex™ from Vertellus
Vertellus™ is the leader in specialty chemicals that prides itself on being a Responsible Care® company for various consumer goods, agriculture, nutrition, fine chemicals, personal care, pharmaceutical, plastic, coatings, and industrial markets. As a lead supplier of natural-based citric acid esters in North America, Vertellus™ has the proprietary chemistry for sizing and coalescing agents that improve coating formulations.
Citroflex™ is a range of citric acid esters from Vertellus™ with multiple functionalities and performance benefits for polymer systems. Citroflex™ products are commonly known as plasticizers and plastics additives, but they are also very effective coalescing agents used in paints and coating formulations.
A coalescing agent's primary role is to soften the polymer, allowing a solid uniform continuous film as the paint dries. They are stabilizers or temporary plasticizers that provide an even dispersion for polymer or resin. Coalescing agents help form polymeric films at ambient temperatures and stabilize the coating when the water or solvent evaporates.
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Why Citroflex™ Citric Acid Esters?
Criteria for selecting a Coalescent Agent
- The coalescent agent additives must be compatible with the base polymer of the paint or the coating formulation.
- Coalescent agents additives are used to decrease the MFFT of the polymer-coalescent system. The coalescing aid is selected based on the base polymer glass-transition (Tg) temperature, which defines the baseline minimum film formation temperature (MFFT).
- Coalescent agent additives with low evaporation rates are more effective coalescents, especially in formulations of water-based and low VOC coatings.
Water and Polymer Solubility Balance
- It is vital to select a coalescent agent with low water solubility and high polymer solubility. The optimal solubility ensures the film formation stability and prevents the coalescent from evaporating with the solvent (water).
Why Citroflex™ Coalescing Agents for Your Paints and Coatings