NPI-501 (CAS 106797-53-9)
| CAS No. | 106797-53-9 |
|---|---|
| Category | Photoinitiators |
| Purity | ≥98.00% |
| Packaging | 20kg/carton |
NPI-501 is a novel free radical photoinitiator with high reactivity, low odor, low migration and low yellowing. It has good solubility in water and is suitable for most water-borne UV curing systems, especially water-based coatings and inks.
Equivalent grades. The same substance is sold by other manufacturers as Omnirad 2959, Irgacure 2959. It is the same CAS number (106797-53-9) and the same chemistry, so a formulation written around one of those grades transfers directly.
Introduction
NPI-501 is a hydroxyl ketone photoinitiator with one property that makes it unusual in this catalogue: it dissolves in water. That opens water-borne UV systems, which most photoinitiators cannot serve because they are oil-soluble by nature.
It also has a genuine United States regulatory footing, which almost nothing else in this range does. It is the photoinitiator known in the market as 2959, and it is listed in 21 CFR 175.105 and 175.125 for use as a photoinitiator in adhesives at a level not exceeding 5 percent by weight. That is a real listing, not a self-declaration, and it is worth knowing if you sell into the US.
Physical & Chemical Properties
White powder. Chemical name 2-hydroxy-1-[4-(2-hydroxyethoxy)phenyl]-2-methylpropan-1-one. Molecular formula C12H16O4, molecular weight 224.25, purity ≥98.00%, melting range 86–90 °C, loss on drying ≤0.50%. Absorption maximum at 276 nm.
Applications
Recommended at 1–3%. Suited to water-borne UV-curable coatings and inks, and to systems where a hydrophilic initiator is needed. Low odour and low yellowing.
Regulatory status
As above, NPI-501 carries a US 21 CFR listing for adhesives at up to 5 percent, which is unusual in this product family. The listing is use-specific: it covers adhesives under those sections, and it should not be read as a general food-contact approval. Elsewhere the substance has no harmonised CLP classification and is not on the REACH Candidate List. It is not listed in Swiss Annex 10.
Handling & Storage
Store sealed in a cool, dry, dark area. One year shelf life from production. Consult the SDS.
Packaging
20 kg cartons. COA per batch, SDS in English, samples available.
Applications & Industries
Coatings & Paints
Metal driers (cobalt, manganese, zirconium octoate, naphthenates) and photoinitiators for coatings, paints, varnishes and industrial finishes — with COA & MSDS per batch.
UV Curing & Printing Inks
Free radical photoinitiators for UV-curable inks, coatings, adhesives and 3D printing — 1173, 184, 369, 907, ITX, DETX, TPO/TPO-L and liquid blends, QC-tested per batch.
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