T-61336 is a difunctional fluorine-modified acrylate UV resin with a typical refractive index of 1.336. It is characterized by low viscosity, good compatibility, and a relatively soft cured film. The product does not contain heavy metals and is positioned to meet RoHS and PFAS-related environmental requirements. With 100% effective content, T-61336 is suitable for evaluation in nanoimprint and transfer processes, bonding applications, and as a main resin for low-refractive-index functional films and optical UV coatings, inks, and adhesives.
The data in this article are typical values intended for formulation screening. For commercial use, always refer to the supplier's current controlled TDS, SDS, and batch certificate of analysis.
Typical Technical Properties
| Property | Typical Value |
|---|---|
| Functionality | Difunctional |
| Refractive index (RI) | 1.336 |
| Viscosity at 25°C | 500 mPa·s |
| Tg | 15°C |
| Molecular weight (GPC) | 1,100 |
| Elongation at break | 55% |
| Color (Gardner) | 2 |
| Acid value | ≤ 2 mg KOH/g |
| Specific gravity | 1.26 |
| Effective content | 100% |
T-61336 has a notably lower viscosity than higher-viscosity grades in the same series, which can be useful for thin-layer coating, leveling, and transfer processes. Its Tg of 15°C and elongation at break of 55% correspond to a relatively soft film profile. For optical bonding or functional film applications where flexibility and low shrinkage are relevant, T-61336 can be considered as a candidate resin. The refractive index of 1.336 falls within the typical range of fluorine-modified low-index resins and is suitable for low-index layers or for combination with higher-index materials.
Curing Behavior and Process Notes
Due to its high fluorine content, T-61336 requires curing under anaerobic film-covered conditions or under nitrogen protection when applied as a thin film. This is related to oxygen inhibition in radical acrylate polymerization: oxygen consumes surface radicals, and the effect is more pronounced in thin layers, particularly in low-surface-energy fluorinated systems. For thicker coatings or dispensing adhesive applications, process conditions should be verified based on film thickness, light intensity, and photoinitiator system.
In the series comparison table, T-61336 has a cure speed rating of 2 on a scale where 1 is the lowest and 10 is the highest. This places it toward the slower end of the series. When designing formulations and production lines, it is therefore advisable to evaluate inert atmosphere protection for thin films, photoinitiator selection, and UV dose together through trial runs rather than relying on a single rating.
Main Application Areas
Low-Refractive-Index UV Coatings and Functional Films
T-61336 is recommended for UV coatings, inks, and adhesives used in functional films and optical materials requiring low refractive index, such as medical devices, communication components, optical fiber coatings, anti-reflective coatings, and AR film materials. Its low viscosity can help with thin-layer coating and leveling, while the soft film profile may suit functional film structures that require a degree of flexibility.
Nanoimprint and Transfer Processes
The TDS suggests T-61336 for nanoimprint or transfer processes. Low viscosity can help fill microstructures and reduce coating defects, but thin-film curing still requires attention to anaerobic film covering or nitrogen protection. The specific process window should be verified with respect to mold material, film thickness, exposure conditions, and demolding requirements.
UV Adhesives
The high-fluorine structure of T-61336 provides good leveling, heat resistance, low refractive index, and low shrinkage. It can be evaluated for optical bonding or low-index adhesive layers. For optical assemblies sensitive to interfacial reflection, a low-index adhesive layer may help reduce reflection loss caused by refractive index mismatch, but actual performance should be tested with the specific substrates, adhesive thickness, and curing conditions.
Compatibility and Dilution Recommendations
Monomer dilution: The TDS recommends LM-502 fluorine-modified acrylate monomer for dissolution and dilution to adjust viscosity for application requirements. Using a fluorinated monomer helps maintain the low-index character of the formulation while reducing viscosity. The addition level of conventional acrylate monomers should be evaluated against the final refractive index target.
Polymer blending: T-61336 is described as having good compatibility with most fluorinated resins and monomers in the same series. Nevertheless, the compatibility of fluorinated resins with conventional hydrocarbon-based resins is generally limited. It is recommended to pre-mix with a low-molecular-weight fluorinated monomer or low-viscosity resin at low shear, confirm that the blend is uniform and free of haze or precipitation, and then add other components. Direct high-shear mixing with high-viscosity or high-molecular-weight polymers may increase compatibility risk.
Series Comparison Reference
The following table summarizes data from the original TDS for similar resin grades. Adhesion, flexibility, and cure speed are relative ratings or test values; the specific test methods and units should be confirmed with the supplier.
| Property | T-61330 | T-61336 | T-61360 | T-61370 | T-61380 |
|---|---|---|---|---|---|
| Viscosity (cps) | 4000 | 500 | 2500 | 800 | 9000 |
| Pencil hardness | H | B | B3H | 2H | 3H |
| Adhesion | 5 | 4 | 7 | 7 | 5 |
| Flexibility | 4 | 7 | 5 | 3 | 2 |
| Refractive index | 1.330 | 1.336 | 1.360 | 1.370 | 1.380 |
| Cure speed | 3 | 2 | 6 | 7 | 8 |
Note: Cure speed is rated on a scale where 1 is the lowest and 10 is the highest. "B3H" is retained as it appears in the original TDS; its exact meaning should be confirmed with the supplier. Adhesion and flexibility values are listed without units in the source table, and complete test descriptions should be requested during sampling.
The table shows that T-61336 is characterized by low viscosity and relatively high flexibility within the series. Its refractive index is lower than T-61360 and higher grades, while its cure speed rating is on the slower side. Formulators can use this comparison to screen grades based on target refractive index, hardness, and cure cycle.
Environmental and Compliance Notes
T-61336 does not contain heavy metals and is positioned to meet RoHS and PFAS-related environmental requirements. It should be noted that PFAS regulatory frameworks continue to evolve in different markets. Formulators targeting export markets should verify the current compliance status, scope, and possible exemptions for the target market during material selection, and keep controlled TDS and compliance statements synchronized with the supplier.
FAQ
Q1: What is the main difference between T-61336 and T-61330?
Both are difunctional fluorine-modified low refractive index UV resins. T-61336 has a typical refractive index of 1.336, viscosity of 500 mPa·s, Tg of 15°C, and elongation at break of 55%, giving it a lower-viscosity and softer profile. T-61330 has a typical refractive index of 1.330, viscosity of 4,000 mPa·s, and Tg of 55°C. Selection should be based on application viscosity, film flexibility, and refractive index requirements.
Q2: Why does T-61336 require anaerobic or nitrogen protection for thin films?
High-fluorine systems are more affected by oxygen inhibition in thin layers. Anaerobic film covering or nitrogen protection helps ensure surface cure. The specific atmosphere, light intensity, and photoinitiator level should be determined through trial runs.
Q3: Can conventional acrylate monomers be used to dilute T-61336?
They can be used to adjust viscosity, but conventional monomers usually have a higher refractive index than fluorine-modified monomers. The higher the addition level, the more noticeable the effect on final refractive index. If low refractive index is a key target, LM-502 or other fluorine-modified monomers should be evaluated first.
Q4: Is T-61336 suitable as a main resin for optical fiber coatings?
The TDS lists optical fiber coatings among the recommended low-refractive-index optical material applications. Before use, the resin should be systematically verified against fiber process requirements for cure speed, modulus, adhesion, and environmental resistance, and the current controlled TDS and batch COA should be used as the final reference.