CAS: 2149581-44-0｜Polymerizable Benzophenone Type II Photoinitiator Monomer, Solving Migration Pain Points of Small-Molecule Photoinitiators

As the UV curing industry advances toward high-threshold applications including food-contact packaging, microelectronic photosensitive materials and biological hydrogels, conventional small-molecule benzophenone photoinitiators have long restricted high-end formulation commercialization due to inherent drawbacks such as post-curing migration, precipitation, odor emission and film contamination. 2-(4-benzoylphenoxy)ethyl acrylate (CAS 2149581-44-0), a new-generation polymerizable Type II hydrogen-abstraction photoinitiator monomer, integrates benzophenone photosensitive moiety and polymerizable acrylate double bond within one molecular structure. It fundamentally resolves migration and precipitation issues of small-molecule initiators at molecular level, delivering an innovative solution for high-performance UV curing systems.

Basic Product Information

*CAS No.: 2149581-44-0

*Chemical Name: 2-(4-benzoylphenoxy)ethyl acrylate

*Product Category: Polymerizable Type II (hydrogen-abstraction) photoinitiator monomer

*Core Structural Feature: Molecule contains both benzophenone photosensitive group and polymerizable acrylate double bond, adopting dual-functional integrated design

Core Product Advantages

1.Low migration, low precipitation, low extraction with greatly enhanced safety Unlike conventional benzophenone, this product bears built-in acrylate double bonds. Under UV irradiation, hydrogen abstraction occurs to generate free radicals; meanwhile, the double bonds participate directly in polymerization of acrylate systems and covalently anchor into the crosslinked polymer network. No free molecules remain inside the cured film after crosslinking, which drastically reduces migration, leaching and volatilization risks of small molecules. It effectively cuts finished-product odor and surface contamination, complying with stringent extractable substance regulations for food-contact materials.

2.Retain high initiating efficiency of mature benzophenone curing systems As a Type II hydrogen-abstraction photoinitiator, it works synergistically with tertiary amine co-initiators. Under UV exposure, it efficiently abstracts hydrogen to produce active free radicals and rapidly trigger crosslinking curing of acrylate prepolymers and reactive diluents. It maintains excellent surface curing performance characteristic of benzophenone systems with low formulation adaptation threshold; existing benzophenone formulations can be directly replaced and optimized.

3.Excellent formulation compatibility for multi-substrate systems With optimized molecular structure, it features good solubility in various UV oligomers and reactive monomers and resists crystallization and precipitation. Suitable for transparent systems, it can be applied to UV coatings on plastic, paper, wood and other substrates. It improves weather resistance of coatings and avoids defects such as haze and loss of gloss.

4.Wide application coverage for high-end emerging sectors The product breaks application boundaries of traditional photoinitiators. It is applicable to conventional UV coatings, printing inks, overprint varnishes, UV pressure-sensitive adhesives and structural adhesives, as well as high-value new materials including photoresist insulating layers for electronics, SLA UV-curable 3D printing resins and photo-crosslinkable biological hydrogels. It reduces component contamination in microelectronic photosensitive materials and lowers risks from leachable photosensitive fragments in biological hydrogel formulations.

Formulation Guidelines

*Recommended Dosage: 1%–4% by total mass of formulation

*Matching System: Type II hydrogen-abstraction mechanism. Tertiary amine co-initiators are mandatory for optimal photoinitiation efficiency.

*Curing Light Source: Compatible with conventional UV mercury lamps and UV-LED light sources (main absorption band at 365 nm)

*Applicable Systems: All free-radical acrylate UV curing systems

Detailed Application Fields

✅ Food-contact packaging: Lamination adhesives for flexible packaging, printing overprint varnishes. Low migration property meets regulatory requirements for food-contact materials and reduces safety risks from precipitates.

✅ Industrial UV coatings: Topcoat coatings for plastic, wood and paper. Low odor and enhanced coating weather resistance.

✅ Printing inks: UV inks for screen printing, flexo printing and offset printing to mitigate ink migration and contamination.

✅ Electronic photosensitive materials: Photoresist insulating layers and UV curable protective adhesives for electronic components, preventing contamination of precision devices by free small molecules.

✅ Additive manufacturing: SLA UV-curable 3D printing resins to reduce model precipitation and odor.

✅ Biomedical materials: Photo-crosslinkable hydrogels with reduced leachable components, suitable for formulation development of low-cytotoxicity biomaterials.

Storage & Safety Notes

Seal and store in cool, dark warehouses away from UV light and heat sources; keep separated from strong oxidants. Follow standard fine chemical protection protocols during handling. COA certificate of analysis and SDS safety data sheet are available upon request. Samples for lab trials, pilot-scale and mass industrial supply are supported, together with professional formulation technical support.

Summary: CAS 2149581-44-0 is a functional monomer targeting the high-end eco-friendly UV curing market. It retains curing advantages of benzophenone systems and addresses migration pain points via molecular design. It serves as a preferred raw material to replace conventional small-molecule benzophenone for UV formulations requiring low extraction, low odor and high safety.