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Description
Trimethylolpropane Triacrylate (TMPTA) is a trifunctional acrylic ester monomer widely used as a reactive diluent, crosslinking agent, and polymerization component in ultraviolet (UV)-curable coatings, inks, adhesives, composites, dental materials, 3D printing resins, and high-performance polymers. It is synthesized by esterifying trimethylolpropane (TMP) with acrylic acid, producing a highly reactive molecule containing three acrylate functional groups.
Due to its trifunctional structure, TMPTA readily undergoes free-radical polymerization upon exposure to ultraviolet light, electron beam radiation, or suitable thermal initiators. The resulting highly crosslinked polymer networks exhibit exceptional hardness, chemical resistance, abrasion resistance, adhesion, weatherability, and thermal stability. These properties make TMPTA one of the most important multifunctional monomers in radiation-curing technology.
TMPTA is widely employed in industrial coatings, wood finishes, plastic coatings, electronics, optical materials, medical devices, additive manufacturing (3D printing), and advanced composite systems where rapid curing and superior mechanical performance are required.
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CAS Number
CAS Number: 15625-89-5
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Synonyms
• Trimethylolpropane Triacrylate
• TMPTA
• Trimethylolpropane Trisacrylate
• Propane-1,2,3-triyl Triacrylate
• TMP Triacrylate
• Acrylic Acid Trimethylolpropane Ester
• Multifunctional Acrylate Monomer
• Triacrylate Ester
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Physical Properties
Trimethylolpropane Triacrylate is supplied as a clear, colorless to pale yellow liquid with relatively low viscosity and a mild ester-like odor. It exhibits excellent compatibility with numerous acrylic monomers, oligomers, and polymer systems.
Typical characteristics include:
• Appearance: Clear, colorless to pale yellow liquid
• Physical state: Liquid
• Odor: Mild characteristic ester odor
• Molecular formula: C₁₅H₂₀O₆
• Molecular weight: 296.32 g/mol
• Density: Approximately 1.10–1.12 g/cm³
• Boiling point: Greater than 300°C (decomposes)
• Flash point: Approximately 110–120°C
• Viscosity: Low to moderate
• Water solubility: Slightly soluble
Its relatively low viscosity makes TMPTA an effective reactive diluent in UV-curable formulations.
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Chemical Properties
TMPTA contains three highly reactive acrylate double bonds capable of rapid free-radical polymerization. These multiple reactive sites enable the formation of densely crosslinked polymer structures with outstanding mechanical and chemical performance.
Important chemical characteristics include:
• Trifunctional acrylate monomer
• High polymerization reactivity
• Excellent crosslinking efficiency
• Low volatility
• High hardness after curing
• Excellent chemical resistance
• Good weather resistance
• Excellent adhesion to many substrates
Because of its multifunctionality, TMPTA significantly increases the crosslink density of cured polymer networks.
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Manufacturing Process
Commercial TMPTA is manufactured through esterification of trimethylolpropane with acrylic acid under carefully controlled reaction conditions.
Typical manufacturing stages include:
• Purification of trimethylolpropane
• Addition of acrylic acid
• Catalytic esterification
• Removal of reaction water
• Neutralization
• Vacuum purification
• Inhibitor addition to prevent premature polymerization
• Filtration
• Quality control testing
• Packaging
Polymerization inhibitors are added during production and storage to maintain product stability.
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Mechanism of Action
TMPTA functions through free-radical polymerization.
Upon exposure to ultraviolet light or suitable thermal initiators, the acrylate double bonds generate reactive radicals that rapidly polymerize with neighboring monomers and oligomers. Because each TMPTA molecule contains three reactive acrylate groups, extensive crosslinking occurs, producing highly durable three-dimensional polymer networks.
Its principal functions include:
• Crosslinking
• Polymer network formation
• Hardness enhancement
• Chemical resistance improvement
• Abrasion resistance enhancement
• Adhesion improvement
• Rapid curing
The high crosslink density contributes to outstanding mechanical and chemical performance.
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Applications
TMPTA has numerous industrial applications.
UV Coatings
• Wood coatings
• Plastic coatings
• Metal coatings
• Industrial finishes
• Automotive coatings
Printing Industry
• UV-curable printing inks
• Screen printing inks
• Digital inks
• Packaging inks
Adhesives
• UV adhesives
• Optical adhesives
• Electronic adhesives
• Structural bonding systems
Electronics
• Printed circuit boards
• Protective coatings
• Optical components
• Electronic encapsulation
3D Printing
• Photopolymer resins
• SLA printing
• DLP printing
• High-resolution additive manufacturing
Medical Industry
• Dental restorative materials
• Medical coatings
• Biomedical photopolymers
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Advantages
TMPTA provides numerous industrial advantages.
• Extremely rapid curing
• High crosslink density
• Excellent hardness
• Outstanding abrasion resistance
• Superior chemical resistance
• Excellent adhesion
• Low volatility
• Good weather resistance
• High productivity
• Broad formulation compatibility
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Limitations
Certain limitations should be considered.
• Skin sensitizer upon repeated exposure
• May cause eye irritation
• Oxygen inhibition at exposed surfaces
• Brittle polymers if used at excessive concentrations
• Requires polymerization inhibitors during storage
• Sensitive to prolonged UV exposure before use
