Ethoxylated Trimethylolpropane Triacrylate丨CAS 28961-43-5

Chemical Overview:
Ethoxylated trimethylolpropane triacrylate丨CAS 28961-43-5 (ETMPTA) is a multifunctional acrylate monomer derived from trimethylolpropane (TMP), which is ethoxylated and then acrylated. It contains three acrylate groups attached to a trimethylolpropane backbone via ethoxy linkages. The ethoxylation imparts improved flexibility, hydrophilicity, and solubility compared to non-ethoxylated counterparts.

Applications

UV-Curable Coatings and Inks
ETMPTA is widely used in ultraviolet (UV) curing formulations due to its multiple acrylate functionalities, enabling rapid polymerization upon UV exposure. Applications include:

Protective coatings: Used in wood finishes, automotive coatings, and metal surface coatings for hardness, chemical resistance, and gloss.

Printing inks: Provides fast curing, adhesion, and durability in flexographic, gravure, and screen printing inks.

Adhesives and sealants: Forms tough, flexible bonds with quick curing times.

3D Printing Resins
The triacrylate functionality makes ETMPTA ideal for photopolymer resins used in stereolithography (SLA) and digital light processing (DLP) 3D printing, enabling:

High crosslink density for mechanical strength.

Adjustable viscosity and flexibility due to ethoxylation.

Rapid curing and high-resolution printing.

Electronics and Optical Materials
ETMPTA is used in formulations for electronic encapsulants, coatings, and optical adhesives where:

High transparency and low yellowing are required.

Mechanical durability and chemical resistance are critical.

Precise curing and dimensional stability are necessary.

Dental and Medical Applications
It is employed in UV-curable dental composites, adhesives, and restorative materials owing to:

Biocompatibility when properly formulated.

Ability to rapidly polymerize with good mechanical properties.

Controlled flexibility and toughness through ethoxylation.

Composite and Laminates
Ethoxylated trimethylolpropane triacrylate丨CAS 28961-43-5 is used as a crosslinking agent in composite materials and laminates to improve:

Mechanical strength and toughness.

Resistance to environmental degradation.

Surface hardness and chemical resistance.

Benefits

Multifunctionality for Crosslinking
The triacrylate groups enable extensive crosslinking during curing, producing highly durable and chemically resistant polymers with excellent mechanical strength.

Enhanced Flexibility and Hydrophilicity
Ethoxylation introduces ether linkages that increase flexibility and improve compatibility with various formulation components, reducing brittleness common in acrylate networks.

Rapid UV Curing
ETMPTA polymerizes quickly under UV light, enabling efficient manufacturing processes with low energy consumption and minimal volatile organic compounds (VOCs) emissions.

Improved Adhesion and Clarity
The molecular structure facilitates strong adhesion to substrates and forms clear, non-yellowing films suitable for optical and electronic applications.

Versatility in Formulation
Compatible with a wide range of photoinitiators, oligomers, and additives, ETMPTA allows formulators to tailor properties such as hardness, flexibility, and chemical resistance.

Summary

Ethoxylated trimethylolpropane triacrylate丨CAS 28961-43-5 is a multifunctional acrylate monomer prized for its ability to form highly crosslinked, flexible, and durable polymer networks through UV curing. It finds extensive use in coatings, inks, adhesives, 3D printing resins, electronics, and medical materials. Its rapid curing, excellent mechanical properties, and formulation versatility make it a valuable component in advanced polymer and material technologies.