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Description
Trioctyl Trimellitate (TOTM) is a high-performance, non-volatile trimellitate ester plasticizer widely used to improve the flexibility, durability, and thermal stability of polyvinyl chloride (PVC) and other polymeric materials. It is synthesized by the esterification of trimellitic anhydride (TMA) with 2-ethylhexanol, resulting in a high-molecular-weight ester with excellent permanence and exceptional resistance to heat extraction, migration, and volatilization.
Compared with conventional plasticizers such as dioctyl phthalate (DOP) or diisononyl phthalate (DINP), TOTM exhibits significantly lower volatility and migration, making it particularly suitable for applications requiring long-term performance under elevated temperatures. It is extensively employed in automotive wire and cable insulation, medical devices, electrical components, aerospace materials, industrial hoses, roofing membranes, and high-temperature PVC compounds.
Due to its outstanding electrical insulation properties, low extraction by oils, excellent weather resistance, and superior aging characteristics, TOTM is recognized as one of the most important permanent plasticizers used in demanding industrial applications.
CAS Number
CAS Number: 3319-31-1
Synonyms
Physical Properties
Trioctyl Trimellitate is supplied as a clear, colorless to pale yellow oily liquid with very low volatility and excellent thermal stability. Its relatively high molecular weight contributes to outstanding permanence within polymer matrices.
Typical characteristics include:
Its exceptionally high boiling point contributes to excellent long-term thermal performance.
Chemical Properties
TOTM is a triester of trimellitic acid containing three branched 2-ethylhexyl ester groups. Its aromatic core and high molecular weight provide superior permanence and resistance to extraction.
Important chemical characteristics include:
These characteristics make TOTM especially suitable for high-temperature polymer applications.
Manufacturing Process
Commercial TOTM is manufactured by esterifying trimellitic anhydride with excess 2-ethylhexanol under controlled reaction conditions.
Typical manufacturing stages include:
The finished product undergoes purification to ensure high ester content and minimal residual acidity.
Mechanism of Action
TOTM functions by positioning itself between adjacent polymer chains within PVC and other compatible polymers. This reduces intermolecular forces, increases chain mobility, and enhances flexibility without chemically reacting with the polymer.
Its principal functions include:
Because of its large molecular structure, TOTM remains within the polymer for extended service life, minimizing loss through volatilization or extraction.
Applications
TOTM has numerous industrial applications.
PVC Industry
Automotive Industry
Medical Industry
Electrical Industry
Construction Industry
