Hydroxypropyl Methacrylate
CAS Number: 27813-02-1
Hydroxypropyl methacrylate (HPMA) is a hydroxyl-functional methacrylic monomer that incorporates pendant hydroxyl groups with greater hydrophobicity than HEA. It is the preferred functional monomer for high-solids acrylic coatings, automotive refinish systems, and thermosetting powder coatings where controlled crosslink density and weather resistance are critical.
Technical Specifications
| appearance | Colorless to pale yellow transparent liquid |
| purity (%) | ≥96.0 |
| water content (%) | ≤0.1 |
| inhibitor (MEHQ, ppm) | 200 ± 50 |
| hydroxyl value (mg KOH/g) | 390–410 |
Applications
- High-solids and 2K automotive topcoat acrylic resins
- Powder coating thermosetting acrylic resin synthesis
- Automotive OEM and refinish clear coat formulations
- Industrial maintenance coatings requiring UV stability
- Coil and pre-coated metal coating systems
Key Features
- Higher hydrophobicity than HEA yields better water resistance in crosslinked coatings
- Alpha-methyl group increases copolymer hardness and chemical resistance
- Precisely defined hydroxyl equivalent weight for stoichiometric NCO/OH formulation
- Low yellowing tendency suitable for clearcoats and light-colored topcoats
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CAS Number
27813-02-1
Category
Polymer Synthesis ChemicalsAvailability
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