H-Nu Visible Light & Infrared Photoinitiators

Commercial Photoinitiators: H-Nu 470

Experimental Photoinitiators: H-Nu 535 and 635, H-Nu-Blue 640 and 660 and H-Nu-IR 780 and 815

Panchromatic absorbance, 350-850 nm among all five photoinitiators

• H-Nu 470, 535 and 635 photoinitiators are capable of curing resins via two mechanisms:
  • Acrylates (free-radical)
  • Epoxides   (cationic)
• Capable of significant depth of cure, > 1 in.
• Enhanced adhesion/depth of cure of pigmented formulations
• Cure through UV opaque, pigmented, colored substrates (i.e. red plastic).
• Photoinitiator bleaching: pale or no residual color
• Bleaching/Color change indicator of exposure or cure with UV/visible light

H-Nu 470

5,7-diiodo-3-butoxy-6-fluorone
CAS # 161728-47-8
H-Nu 470 and its use are protected by U.S. Patents 5,451,343 and 5,395,862

Physical Properties

• Peak absorbance at 470 nm with broad absorbance range from 350 nm to 530 nm
• High Absorptivity - Very low concentrations needed, typically 0.01-0.15 wt%
• Visible light cure of acrylates in combination with amine and iodonium synergists (electron donor co-initiators)
• Speed of Cure - Moderate to fast depending on formulation.
• Adding H-Nu 470 to an existing UV formulation can achieve a reduction in the level of UV photoinitiators normally required by as much as 50%
• Instead of curing thin multi-layered coatings H-Nu 470 can provide a thick cured coating after one pass saving time and energy.
• Visible light cure (photosensitization) of iodonium salts to cure epoxy resins (e.g. Cycloaliphatic, Bisphenol A, Novolacs, and others)
• H-Nu 470 is commercial and is available in test kits or large volumes.
• Low Volume Exemption (LVE) from EPA (letter on File)
• Non-toxic: LD50 > 5,000 mg/kg, orally in rats
• Ames negative; moderate eye irritant; moderate skin irritant

H-Nu 535 and 635

• Experimental photoinitiators with absorbance ranges from 450-560 nm for H-Nu 535 (lmax 535 nm) and 500-680 nm for H-Nu 635 (lmax 635 nm)

• Take advantage of the output of common laser sources Nd:YAG (532 nm) for H-Nu 535 and He-Ne or diode laser (633 and 635 nm respectively) for H-Nu 635 as well as work with common lamps

• Visible light cure of acrylates in combination with amine and iodonium synergists

• Visible light cure (photosensitization) of iodonium salts to cure epoxy resins

• High Absorptivity – very low photoinitiator concentrations needed, typically 0.05-0.15 wt%.

H-Nu-Blue 640 and 660

• Absorbance in the 575-700 nm range for curing with red colored light sources including red handheld lasers
• Excellent solubility in a variety of monomers
• Does not require a coinitiator
• Capable of curing wide range of acrylates via free-radical mechanism
• Cure through colored substrates (i.e. red plastic).
• Initiator bleaching: pale or no residual color.
• Bleaching/Color change indicator of exposure or cure with UV/visible light

Important

These materials are not intended for use in products for which would be regulated by the Food and Drug Administration unless the finished product is tested in accordance with the FDA and other applicable safety testing requirements.  Spectra Group Limited, Inc. is not able to recommend these materials for such uses and assumes no liability for any such use.  Technical advice furnished by the seller shall not constitute a warranty or condition, statutory or otherwise, which is expressly disclaimed, all such advise being given and accepted is at the buyer’s risk.  The test results under controlled conditions.  Data and results that the user or buyer achieves may differ.  Optimization, scale-up and product performance are the responsibility of the buyer or user.

Product Safety and Handling

Please read MSDS information before handling any of the above described products. Download H-Nu 470 MSDS.pdf Additional MSDS for other products available on request.

To Place an order for H-Nu photoinitiators please go to our Order Page for quantity and pricing information.

Adobe Acrobat Reader is required to view or print .pdf files.
All prices are subject to change without notice.

For additional information, please call us at (419) 837-9783 or e-mail us at info@sglinc.com

 

Spectra Group Limited, Inc. • 27800 Lemoyne Rd., Suite J

Millbury, OH 43447 • 1-419-837-9783

Updated 5/15/08