Trimethylolpropane

Trimethylolpropane (CAS 77-99-6), commonly abbreviated as TMP, is a trifunctional aliphatic alcohol used as a building block in polymer synthesis and resin manufacturing.

Where is Trimethylolpropane used?

• Coatings: reacts with isocyanates or melamine resins to produce polyurethane and alkyd systems with improved hardness, flexibility, and chemical resistance
• Adhesives and sealants: builds polyurethane prepolymers where controlled cross-link density affects bond strength and elasticity
• Plastics: branching agent in polyester and polycarbonate production, influencing molecular weight distribution and mechanical performance
• Personal care: humectant and stabilizer in emollient systems and film-forming preparations
• Its three hydroxyl groups enable controlled cross-linking and branching.

Commercial specifications

• Standard commercial grades include technical and industrial purity levels
• Typically at 99%+ purity
• Specialty grades meeting stricter quality specifications for cosmetic and high-performance polymer applications