2,2-Dimethylolpropionic Acid (DMPA)

CAS NO. 4767-03-7

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Automotive coatings monomer paint additive industrial coating adhesives

Product Description

Applications

Parameter	Specification
Product Name	2,2-Dimethylol Propionic Acid (DMPA)
Synonyms	Bis-MPA; Dimethylolpropanoic Acid; 2,2-Bis(hydroxymethyl)propionic Acid
CAS Number	4767-03-7
IUPAC Name	2,2-bis(hydroxymethyl)propanoic acid
Molecular Formula	C₅H₁₀O₄
Molecular Weight	134.13 g/mol
Appearance	White free-flowing granular solid
Purity (HPLC Assay)	≥ 99.0%
Hydroxyl Value	≥ 24.0%
Acid Value	410 – 425 mg KOH/g
Neutral Equivalent	≤ 141.0
Moisture Content	≤ 0.3%
Melting Point	178 – 185 °C
Ash Content	≤ 0.02%
Standard Packaging	25 kg drum; palletized options available
Quality Assurance	Each production batch tested against the above specification

Each production batch is tested against the specification above. Independent third-party laboratory verification is available on request.

DMPA (CAS 4767-03-7) — Industrial Application Categories

2,2-Dimethylolpropionic Acid (DMPA, also known as Bis-MPA; IUPAC: 2,2-bis(hydroxymethyl)propanoic acid; Spanish: ácido dimetilolpropiónico) is a trifunctional small-molecule monomer carrying two primary hydroxyl groups and one pendant carboxyl group on a neopentyl backbone. Its use as a building block in polymer chemistry has been documented in the industry for several decades. The categories below describe general, publicly documented classes of use; selection of raw materials for any specific formulation remains the responsibility of the end user.

• Waterborne Polyurethane Chemistry

DMPA functions as a chain-extending and self-emulsifying monomer in polyurethane synthesis. After neutralization, its pendant carboxylic acid group introduces ionic character that supports stable dispersion in aqueous systems without the need for external surfactants. This class of use has been part of the polyurethane industry literature since the 1970s.

End Products: waterborne polyurethane dispersions (PUDs), aqueous polyurethane resins, general-purpose waterborne polymer systems.

• Polyurethane Adhesives & Sealants

Polyurethane-based adhesives and sealants are a long-established category of industrial products. Small-molecule polyols that carry both hydroxyl and ionizable functional groups — DMPA among them — have historically been incorporated into polyurethane backbones where an internal ionic center is needed.

End Products: general-purpose polyurethane adhesives, industrial assembly adhesives, polyurethane sealant formulations.

• General Industrial Coatings

Polyurethane, polyester, and alkyd coating chemistries have formed part of the industrial coatings category since the mid-20th century. DMPA is one of several multifunctional monomers documented in public technical literature for use in both solvent-borne and waterborne coating formulations within these established chemistry classes.

End Products: industrial metal coatings, wood coating systems, general industrial protective coatings.

• Hyperbranched Polyester Chemistry

The AB₂-type structure of DMPA — one carboxyl group and two hydroxyl groups per molecule — has been studied in academic polymer chemistry literature since the early 1990s as a building block for hyperbranched and dendritic polyesters. This is a well-documented, publicly available class of polymer chemistry.

End Products: hyperbranched polyester intermediates, dendritic polymer building blocks, specialty research-grade polymer materials.

Structural Note: Each DMPA molecule carries two primary hydroxyl groups and one pendant carboxylic acid group on a 2,2-disubstituted neopentyl backbone. This combination of reactive -OH groups with an ionizable -COOH group on a single small molecule is the structural basis for its traditional role as an internal emulsifier in waterborne polymer chemistry.