Photoinitiators
Photoinitiator MBP
4-Methylbenzophenone
The methyl-substituted benzophenone — stronger absorption than BP, equally economical.
Product Description
MBP is the para-methyl derivative of benzophenone. The electron-donating methyl group shifts absorption slightly to longer wavelength and raises extinction, giving somewhat faster surface cure than unsubstituted benzophenone at equal loading.
Like all Type II initiators it requires an amine synergist (EDB, EHA, EAB) or an active substrate such as polyethers. Typical packages run 2–4 wt% MBP with 1–2 wt% amine in inks and clear coats.
Key Features
- Higher absorption efficiency than plain benzophenone
- Very economical for volume ink systems
- Liquid-range solid, easy to melt-blend
- Broad regulatory history in packaging inks
Applications
- UV offset and screen inks
- Clear overprint varnishes
- Amine-synergist ink packages
- Adhesives and pressure-sensitive systems
- Photopolymer plate applications
Specifications
| CAS No. | 134-84-9 |
|---|---|
| Molecular Formula | C14H12O |
| Molecular Weight | 196.25 |
| Appearance | White flaky crystals |
| Assay (GC) | ≥ 99.0% |
| Melting Point | 54 – 57 °C |
Packaging & Storage
25 kg fiber drum with PE liner. Store cool, dry and protected from light; shelf life 24 months.
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