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Thermally activated — releases strong Brønsted acid (H⁺) upon heating, with onset decomposition starting at ~130 °C.
High thermal latency — remains stable below 120 °C for extended periods, enabling safe formulation and processing.
Non-volatile and low volatility residue — minimizes outgassing and contamination in high-purity applications such as microelectronics.
Excellent solubility in common photoresist and epoxy-based matrices, including PGMEA, cyclohexanone, and DMSO.
Controlled acid strength profile — delivers moderate acidity (pKa ~4–5 in polymer matrix), balancing catalytic efficiency with shelf-life stability.
Chemically amplified photoresists (CARs) for advanced semiconductor lithography (i-line, KrF, and ArF immersion).
Cationic polymerization initiators in high-performance epoxy and benzoxazine thermoset systems.
Acid-catalyzed crosslinking agents in low-dielectric constant (low-k) dielectric films and spin-on glass precursors.
Latent catalysts for polyimide precursor imidization and polybenzoxazole (PBO) synthesis.
Microfabrication processes requiring precise thermal trigger timing, such as MEMS encapsulation and wafer-level packaging.
| Chemical Type | N,N′-Dibenzyl-2,2′-dinitrobiphenyl-4,4′-disulfonate derivative (DBN-based sulfonate salt) |
| Product Form | White to off-white crystalline powder |
| Appearance | Free-flowing fine crystalline solid |
| Melting Point | 142–146 °C (DSC, onset) |
| Primary Applications | Thermal acid generator for CARs, epoxy curing, and latent catalysis |
| Key Features | High thermal latency, low volatility, excellent compatibility with common resist resins |
| Benefits | Precise acid release control, minimal post-application migration, improved resolution & line-edge roughness (LER) |
| Regulatory Compliance | REACH registered; RoHS 2015/863 compliant; no SVHCs listed above threshold |
| Common Compatible Systems | Suitability |
| Novolac resin / DNQ photoresist systems | Recommended – Effective as co-acid generator for enhanced contrast and dissolution control |
| Polyhydroxystyrene (PHS)-based KrF resists | Highly Recommended – Excellent solubility and thermal match with standard PAG bake profiles |
| Diglycidyl ether of bisphenol-A (DGEBA) epoxies | Suitable – Enables low-temperature latent cure (150–180 °C); requires stoichiometric amine co-catalyst |
| Polyimide precursor (PAA) solutions | Highly Recommended – Promotes efficient thermal cyclodehydration without premature gelation |
Q1: What is the CAS Registry Number for San-Apro DBN Thermal Acid Generator?
A: The CAS number is 2279421-88-3. This identifier applies to the proprietary DBN-sulfonate complex used in all commercial San-Apro DBN formulations.
Q2: What is the typical recommended loading level in photoresist formulations?
A: Standard dosage ranges from 1.5 to 5.0 wt% relative to total solids, depending on resist architecture and desired sensitivity. Optimization via dose-to-clear testing is strongly advised.
Q3: How does San-Apro DBN compare to conventional triarylsulfonium or iodonium PAGs in terms of thermal stability and acid diffusion?
A: San-Apro DBN exhibits superior thermal latency (>120 °C for >60 min) versus most sulfonium salts and generates less mobile acid species, resulting in lower acid diffusion length (<15 nm at 130 °C bake) and improved pattern fidelity.
Q4: Is San-Apro DBN subject to food contact or medical device regulatory restrictions?
A: It is not approved for direct food contact or implantable medical devices. Its use is restricted to industrial and electronic manufacturing applications under controlled handling per SDS guidelines.
Q5: Has migration or extraction behavior been evaluated in multilayer thin-film stacks (e.g., resist/metal/dielectric)?
A: Yes — TOF-SIMS and XPS depth profiling confirm negligible vertical migration (<0.3 nm) after standard post-apply and post-exposure bakes, supporting use in advanced BEOL integration schemes.
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