NPI-50103 (CAS 71868-15-0)
| CAS No. | 71868-15-0 |
|---|---|
| Alias | Hydroxy-1-[4-[4-(2-hydroxy-2-methylpropanoyl) phenoxy] phenyl]-2-methylpropan-1-one |
| Category | Photoinitiators |
| Purity | ≥98.00% (HPLC) |
| Packaging | 20kg/drum |
NPI-50103 is a bifunctional free radical photoinitiator with high reactivity, low volatility, low migration, low toxicity, and low yellowing. It is suitable for materials in direct contact with the human body, such as coatings and food packaging inks, and for thin coatings where oxygen inhibition is significant. Its dual functional groups provide enhanced curing performance, especially in deep-cure applications.
Introduction
NPI-50103 is a bifunctional alpha-hydroxy ketone, and the two functional groups are the reason it exists. A molecule with two initiating sites generates more radicals per unit of migration than a monofunctional one does, which lets you reach a given cure with less material moving through the film.
It is aimed at the applications where that matters: coatings and inks for food packaging, materials in direct contact with people, and thin films where oxygen inhibition would otherwise leave the surface tacky. It absorbs at 278 nm, so mercury lamps and 365 nm LEDs suit it better than longer-wavelength arrays.
Physical & Chemical Properties
Off-white powder. Chemical name hydroxy-1-[4-[4-(2-hydroxy-2-methylpropanoyl)phenoxy]phenyl]-2-methylpropan-1-one. Molecular formula C20H22O5, molecular weight 342.39, purity ≥98.00% by HPLC, loss on drying ≤0.50%. Absorption maximum at 278 nm.
Applications
Recommended at 3–5%, used with an amine synergist for improved deep curing. Thin coatings and direct-contact applications are the natural fit.
Regulatory status
NPI-50103 has no harmonised classification under CLP and is not on the REACH Candidate List. It is not listed in Swiss Annex 10.
On migration, here is the honest version. The bifunctional structure and the resulting higher molecular weight are the structural reasons this chemistry is specified where migration matters, and that reasoning is sound. It is not a measurement. Whether a given coating meets a given migration limit depends on film weight, substrate, cure and the layers above, and it has to be tested for your construction. Tell us the construction and we will tell you what data we hold and what you need to generate.
Handling & Storage
Store sealed, cool, dry and dark. 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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