Ethoxylated trimethylolpropane triacrylate

Ethoxylated trimethylolpropane triacrylate (CAS 28961-43-5), commonly abbreviated as EO-TMPTA, is a trifunctional acrylate monomer used as a reactive diluent and crosslinker in UV- and EB-curable systems. The ethoxylation distinguishes it from standard TMPTA by reducing skin sensitization potential and improving flexibility in cured films. These factors significantly influence formulator and procurement decisions.

In UV-curable coatings and varnishes, this monomer controls crosslink density while maintaining surface hardness. It is a standard component in wood, plastic, and paper coatings for industrial use. Printing ink formulators use it to achieve fast cure response and adhesion on flexible substrates. It is particularly effective in flexographic and offset UV inks for high-speed production lines.

Adhesive and sealant manufacturers incorporate it to tune elongation and peel strength in radiation-cured systems. It supports high-gloss, scratch-resistant surfaces with reduced shrinkage stress. Compared to non-ethoxylated alternatives, it is ideal for plastic part finishing and optical coatings. The chemical is supplied as a clear to pale yellow liquid for various industrial applications.

It is available in technical and industrial grades, with ethoxylation levels typically specified by moles of ethylene oxide per hydroxyl group. This is a key parameter buyers should confirm with suppliers. Bulk, IBC, and drum packaging are standard supply formats for this chemical. Proper handling and storage are required to maintain the stability and performance of the monomer over time.