Pyrazoline-based Sensitizers

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Product Description

Product Name	Pyrazoline-based Sensitizers (Synonyms: Pyrazoline Photosensitizer / UV-LED Curing Synergist)
Chemical Category / CAS	Pyrazoline Derivative (Commercial Confidential) *For specific regulatory information (SDS), please contact our sales manager.
Appearance & Spectrum
Appearance: Yellow Powder	Spectrum: Strong absorption at 365-405nm

Appearance	Yellow Powder	Melting Point	188 - 192 ℃
Purity	100 ± 2 %	Decomp. Temp	318.3 ℃ (High Thermal Stability)
Moisture Content	≤ 0.5 %	Solubility (at 20℃)	Toluene: 4.8g/100ml MEK: 1.3g/100ml
Optical Characteristics	λmax (Absorption): 387.0 nm (in DMF) Fluorescence Emission: 476.0 nm (Suitable for Fluorescence Tracing/AOI Inspection)
Wavelength	365 nm (i-line)	385 nm (UV-LED)	395 nm (UV-LED)	405 nm (h-line)
Extinction Coefficient (ε) [M⁻¹·cm⁻¹]	25,720	34,890	33,450	28,112
Absorbance (Abs) (10ppm in DMF)	0.589	0.799	0.766	0.644

* Data indicates extremely high energy capture efficiency in the mainstream UV-LED bands (385-405nm).

Recommended Applications

As a high-efficiency Energy Transfer Photosensitizer, this product is specifically designed to solve low-efficiency issues in long-wavelength curing:

UV-LED Curing Systems (Inks/Varnishes):
Compensates for the low absorption of traditional initiators (e.g., 184, 1173) under 395nm and 405nm LED sources, significantly boosting curing speed.
Deep & Thick Coating Curing:
Leverages high penetration and absorption in long wavelengths to resolve adhesion issues caused by incomplete bottom curing.
LDI Dry Films & Photoresists:
Suitable for high-precision electronic circuit manufacturing requiring extreme photosensitivity (matches i-line, h-line).
Fluorescence Tracing / Light Blocking:
Utilizes its intense 476nm blue fluorescence for online AOI inspection (Conformal Coating). Can also be used as a light-blocking agent in PCB substrates to prevent light leakage during double-sided exposure.

Solving the "Surface Dry, Bottom Wet" Issue in UV-LED Curing?

Royalchem recommends this Broad-Spectrum Photosensitizer. It acts like a "Turbocharger" for your photoinitiator system, effectively capturing 385-405nm energy.
Perfect for: Black/Dark systems, high-filler systems, and thick film formulations.