High quality Ethyl (2,4,6-trimethylbenzoyl) phenylphosphinate/TPO-L Cas 84434-11-7 with best price

Details:

Ethyl (2,4,6-trimethylbenzoyl) phenylphosphinate is a specialized organophosphorus compound primarily used as a photoinitiator in ultraviolet (UV)-curable systems. Below is a structured overview:

Chemical Structure & Properties

• Formula: C2020?H2323?O33?P

• Structure:

  • A phosphinate ester with three substituents on phosphorus:

    1. Phenyl group (–C66?H55?).

    2. 2,4,6-Trimethylbenzoyl group (mesityl-carbonyl, –CO–C66?H22?(CH33?)33?).

    3. Ethoxy group (–O–CH22?CH33?).

  • Combines a UV-absorbing aromatic ketone (trimethylbenzoyl) with a phosphinate backbone.

Primary Applications

1. UV-Curable Resins & Coatings:

   • Acts as a free-radical photoinitiator in UV-curing processes for:

     • Industrial coatings (e.g., wood, plastic, metal).

     • 3D printing resins (SLA/DLP technologies).

     • Dental composites and adhesives.

   • Generates radicals upon UV exposure (typically 300–400 nm), initiating polymerization of acrylates/methacrylates.

2. Inks & Adhesives:

   • Enables rapid curing in printing inks and pressure-sensitive adhesives.

Advantages

• Efficiency: Strong absorption in the UV-A range (~365 nm), compatible with common UV light sources.

• Low Odor/VOC: Favored over traditional initiators like benzophenone or thioxanthones.

• Stability: Resists premature thermal degradation, enhancing shelf life of formulations.

Mechanism of Action

1. UV Excitation: The trimethylbenzoyl group absorbs UV light, promoting electron transfer.

2. Radical Generation: Phosphorus-centered radicals form, initiating chain-growth polymerization of monomers (e.g., acrylates).

Safety & Handling

• Hazards:

  • May cause skin/eye irritation (handle with gloves and goggles).

  • Avoid inhalation of dust/aerosols.

• Storage: Keep in cool, dark conditions to prevent unintended light exposure.

Regulatory & Environmental Notes

• Regulations: Complies with REACH (EU) and FDA guidelines for indirect food contact (if applicable).

• Eco-Toxicity: Low environmental persistence but requires controlled disposal to avoid aquatic contamination.

Synthesis

• Typical Route:

  1. React phenylphosphinic acid with ethyl chloride to form ethyl phenylphosphinite.

  2. Introduce the 2,4,6-trimethylbenzoyl group via a coupling reaction (e.g., using mesitoyl chloride).

Commercial Availability

• Brands: Often sold under trade names like TPO-L (similar to diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide but with ester modification).

• Form: Typically supplied as a yellowish liquid or low-melting solid.

Key Considerations

• Alternatives: Other photoinitiators (e.g., Irgacure 819, TPO) may be used depending on formulation requirements.

• Compatibility: Works synergistically with amine co-initiators or polymeric stabilizers in complex formulations.

This compound bridges photochemistry and materials science, enabling efficient, sustainable curing processes in modern manufacturing. Always follow safety protocols and formulation guidelines for optimal performance.