Photoinitiators
Photoinitiator BCIM
2,2′-Bis(2-chlorophenyl)-4,4′,5,5′-tetraphenyl-1,2′-biimidazole
Biimidazole initiator for photoimaging, dry-film resists and holography.
Product Description
BCIM is a hexaarylbiimidazole (HABI) photoinitiator. Upon UV exposure it cleaves photochemically into lophyl radicals, which in the presence of chain-transfer agents (amines, mercaptans, co-initiators) generate initiating species for radical polymerization — the operating principle of classic photoimaging systems.
It is the functional core of PCB dry-film photoresists, photopolymer recording materials and security-printing photoimaging layers, with excellent latent-image stability. Typical use: 1–5 wt% with matched co-initiators.
Key Features
- Classic HABI chemistry for photoimaging systems
- Excellent latent image stability before development
- Established in dry-film resists and holography
- Synergizes with amines and mercaptan co-initiators
Applications
- PCB dry-film photoresists
- Photoimaging and photo-printing layers
- Holographic recording materials
- Photocrosslinkable imaging coatings
- Security printing systems
Specifications
| CAS No. | 7189-82-4 |
|---|---|
| Molecular Formula | C42H28Cl2N4 |
| Molecular Weight | 659.61 |
| Appearance | Yellow powder |
| Assay (HPLC) | ≥ 98.0% |
| Melting Point | ≥ 195 °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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