Overview
Dimethylolpropionic acid ( CAS 4767-03-7 ), commonly known as DMPA, is a bifunctional monomer carrying both hydroxyl and carboxylic acid groups. It is used primarily to introduce ionic or hydrophilic character into polyurethane and polyester systems.
This unique chemical structure enables water dispersibility without the need for external emulsifiers. In waterborne polyurethane dispersions, DMPA acts as an internal emulsifier where its carboxylic acid group is neutralized.
This process creates stable, solvent-free coatings for wood, leather, and plastic substrates. Adhesive and sealant formulators incorporate it into polyurethane prepolymers where controlled crosslink density and substrate adhesion are required.
In polyester and alkyd resin synthesis, it functions as a chain extender that improves water compatibility for industrial and architectural coating systems. This versatility makes it a staple in modern chemical manufacturing.
Personal care formulators use DMPA-based polyurethane polymers as film-forming agents in hair fixatives and skin-feel modifiers. The material is supplied as a white crystalline powder for easy handling and processing.
Standard commercial grades are available at purities of 98% and above, with technical and high-purity variants offered depending on end-use requirements. It is commonly packaged in 25 kg bags for industrial use.
Bulk quantities are available for industrial procurement to meet large-scale production needs. The product maintains high stability when stored under proper conditions, ensuring consistent performance in various chemical applications.
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Physical Properties
| Melting Point | 190 °C |
| Boiling Point | 167.23°C (rough estimate) |
| Density | 0.84 |
| Flash Point | >150°C |
| Appearance | white crystalline powder |
| Color | White |
| Form | Crystalline Powder |
| Water Solubility | soluble |
| Refractive Index | 1.4240 (estimate) |
| pH | 2.6 (50g/l, H2O, 20℃) |
Safety & Handling
Warning GHS07 Hazard Statements H319 Causes serious eye irritation H335 May cause respiratory irritation Precautionary Statements P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P319 Get medical advice/attention if you feel unwell. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29159000 |
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 4767-03-7
- EC Number
- 225-306-3
- Mol. Weight
- 134.13
- HS Code
- 29159000
- Category
- Alcohols & Glycols