NPI-102 (CAS 86428-83-3)
| CAS No. | 86428-83-3 |
|---|---|
| Alias | Methyl-4-phenylbenzophenone |
| Category | Photoinitiators |
| Purity | ≥99.00% (HPLC) |
| Packaging | 20 kg/carton |
NPI-102 is a general-purpose free radical photoinitiator commonly used as an improved version of BP. It offers high initiation efficiency and low odor, making it especially suitable for food packaging inks and varnishes. The product appears as an off-white to white powder with high purity and reliable batch-to-batch performance.
Introduction
NPI-102 is a substituted benzophenone, and the substitution is the point. The methyl and phenyl groups on the ring shift the absorption to 289 nm and change the odour and volatility profile relative to plain benzophenone, which is why it turns up in varnishes and packaging inks where the cured film's smell matters.
Like all benzophenones it is a Type II initiator: it abstracts hydrogen rather than fragmenting, so it needs a tertiary amine co-initiator and it does not work on its own. It is also not an LED initiator. Its absorption is too short for 395 nm arrays.
Physical & Chemical Properties
Off-white to white powder. Chemical name 3-methyl-4-phenylbenzophenone. Molecular formula C20H16O, molecular weight 272.34, purity ≥99.00% by HPLC, melting range 81.0–84.0 °C, loss on drying ≤0.50%. Absorption maximum at 289 nm.
Applications
Recommended at 3–5% by weight, with an amine synergist. Suited to varnishes and packaging inks where a lower-odour benzophenone is wanted.
Regulatory status
NPI-102 has no harmonised classification under CLP. It is not on the REACH Candidate List and is not listed in Swiss Annex 10. Note that it is a benzophenone derivative, and that the benzophenone family carries a more involved regulatory picture than the parent substance's chemistry alone would suggest; check the position for your specific market and end use. Food-contact use in particular should be confirmed against measured migration from your own construction rather than inferred.
Handling & Storage
Store sealed in a cool, dry, ventilated area. 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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