2 Hydroxypropyl Methacrylate

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2-Hydroxypropyl Methacrylate (HPMA) – A Key Reactive Monomer for High-Performance Polymers

Introduction

2-Hydroxypropyl Methacrylate (HPMA) is a clear, colorless, and low-viscosity liquid that serves as an essential functional monomer in the formulation of advanced polymers, coatings, adhesives, and inks. Belonging to the methacrylate family, HPMA combines a reactive methacrylate group with a hydrophilic hydroxyl group, making it ideal for both crosslinking and hydrophilic performance in polymer networks.

Its balanced chemical structure offers superior adhesion, chemical resistance, and flexibility in a wide range of applications, especially in water-based coatings, UV-curable formulations, and high-performance acrylic resins.

Description

Chemical Identity

  • Chemical Name: 2-Hydroxypropyl Methacrylate

  • Abbreviation: HPMA

  • Chemical Formula: C7H12O3

  • Molecular Weight: 144.17 g/mol

  • CAS Number: 27813-02-1

  • EC Number: 248-666-3


Specifications of 2-Hydroxypropyl Methacrylate

 

Property Specification
Appearance Clear, colorless liquid
Purity ≥ 96%
Boiling Point ~100–102°C at 5 mmHg
Density (20°C) 1.03 g/cm³
Viscosity (25°C) 20–30 mPa·s
Flash Point (Closed Cup) 99°C
Refractive Index (n20/D) 1.451 – 1.454
Solubility Miscible with water and most organic solvents
Stabilizer Content Typically contains MEHQ (monomethyl ether hydroquinone) as inhibitor

Applications of HPMA

🔬 Coatings and Surface Finishes

HPMA is widely used in industrial coatings, protective topcoats, and UV-curable paints. Its hydroxyl group allows for crosslinking with isocyanates or melamine resins, improving durability, scratch resistance, and chemical stability.

🖨️ Printing Inks and Adhesives

As a functional monomer, HPMA enhances adhesion to various substrates and boosts flexibility and resistance to yellowing in inks and pressure-sensitive adhesives.

🧴 Medical and Personal Care Polymers

HPMA is also utilized in the development of biocompatible hydrogels, dental materials, and drug delivery systems due to its ability to form hydrophilic, crosslinked structures.

🏭 Acrylic Resins and Elastomers

It plays a critical role in emulsion polymerization, producing flexible, impact-resistant acrylic resins used in automotive parts, plastic coatings, and construction materials.


Handling and Safety

  • Hazards: HPMA is classified as an irritant and may cause skin or eye irritation.

  • Personal Protective Equipment (PPE): Use gloves, goggles, and protective clothing.

  • Storage Conditions: Store in a cool, dry place away from sunlight and ignition sources. Keep container tightly closed and protected from oxygen to prevent premature polymerization.


Conclusion

2-Hydroxypropyl Methacrylate (HPMA) is a versatile monomer with a broad spectrum of industrial applications, thanks to its unique chemical properties. Its ability to improve adhesion, flexibility, and chemical resistance makes it indispensable in coatings, adhesives, inks, and medical-grade polymers. With high purity and excellent reactivity, HPMA remains a preferred material for formulators seeking durable, high-performance, and customizable polymer solutions.