| HS Code | 116372 |
| Property 1 | Product type: Electronic/EL grade electronic ink curing agent matching DuPont ME780 |
| Property 2 | Chemical nature: Modified aliphatic amine-based curing agent |
| Property 3 | Appearance: Clear light-yellow to colorless liquid |
| Property 4 | Viscosity at 25°C: 80–180 mPa·s |
| Property 5 | Amine value: 220–250 mg KOH/g |
| Property 6 | Specific gravity at 25°C: 1.00–1.10 |
| Property 7 | Non-volatile content: ≥99 wt% |
| Property 8 | Moisture content: ≤0.2 wt% |
| Property 9 | Mixing ratio with DuPont ME780 electronic ink: 100:25 by weight |
| Property 10 | Pot life after mixing at 25°C: 6–8 hours |
| Property 11 | Recommended curing condition: 130°C for 20 minutes or 150°C for 10 minutes |
| Property 12 | Closed-cup flash point: ≥90°C |
| Property 13 | Shelf life in original sealed container: 12 months from production date |
| Property 14 | Storage temperature range: 5–25°C in a dry, sealed container away from sunlight |
As an accredited Electronic Ink Curing Agent (DuPont ME780 Matching Curing Agent) Electronic/EL Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Electronic Ink Curing Agent, DuPont ME780 matching, Electronic/EL Grade, packaged in 1 kg sealed HDPE containers under inert gas. |
| Container Loading (20′ FCL) | One 20-foot FCL loaded with drums on pallets, securely braced, sealed, and ventilated to protect DuPont ME780 curing agent. |
| Shipping | This chemical ships in tightly sealed, moisture-proof containers to preserve purity and reactivity. It is transported as hazardous cargo, requiring proper labeling, ventilation, and temperature control. Ensure compliance with local dangerous goods regulations; avoid extreme heat or open flames. Use dedicated ground freight or approved carriers for safe, stable delivery. |
| Storage | Store in a tightly sealed, original container in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep temperatures stable between 5–25°C and avoid moisture, humidity, and contamination. Maintain strict separation from acids, bases, oxidizers, and food materials. Follow manufacturer shelf-life guidelines and inspect for leakage periodically. |
| Shelf Life | Shelf life is typically 6 months from manufacture when stored unopened in the original container at room temperature, protected from moisture and light. |
The electronic/EL grade curing agent matched to DuPont ME780 silver conductor ink is incorporated directly into the wet ink at 0.9–1.4 wt% of total ink weight after the ink has been sheared to a target viscosity of 18,000–25,000 mPa·s at 10 s⁻¹ on a cone-and-plate viscometer. On flatbed screen-printing lines producing membrane touch switch tail connectors and keypad contacts, the addition is made before final viscosity adjustment with a slow-evaporating glycol ether solvent, because post-thinning addition disturbs silver flake orientation and produces localized over-crosslinking at the screen emulsion interface. Printed tracks on 125 μm polyethylene terephthalate are forced-air dried at 65 °C for 8–12 min, followed by a conveyorized IR-convection cure profile with a 140 °C peak dwell of 20 min. Production records show that flash-off time must be extended when relative humidity exceeds 60 %, otherwise retained moisture reacts at the film surface to create pinholing along the 250 mm print stroke. A 230 mesh stainless-steel screen with 18 μm direct emulsion is used, with blade pressure maintained at 45–60 N/cm and snap-off held at 1.5 mm. Compliance verification for this application references RoHS Directive 2011/65/EU and REACH Regulation (EC) No 1907/2006, with electrical testing performed per ASTM F1896-16 and adhesion testing per ASTM D3359-23. Batch-to-batch variance of silver flake surface area can shift crosslinker demand by ±0.2 wt%, so ink solids content is logged before each mixing campaign. Terminal products are polyester-based membrane touch switch assemblies used in appliance control panels, industrial keypads, and medical device front panels.
For electroluminescent lamp silver rear electrodes, the matched curing agent is added at 1.2–2.0 wt% of total wet ink weight because the cured silver layer must adhere to a high-K dielectric stack without increasing sheet resistance beyond usable limits. The ink is printed directly onto the dielectric layer using a 200 mesh polyester screen with 25 μm emulsion thickness and a 65–70 Shore A squeegee at 80–120 mm/s. After a solvent flash-off zone held at 80 °C for 6 min, the web enters a three-zone forced-air oven with peak temperature of 150 °C for 20 min. Higher addition ratios increase crosslink density and improve resistance to phosphor migration under AC drive conditions, but ratios above 2.5 wt% produce visible edge curl on 125 μm ITO-coated polyester and narrow the overprint window for the rear bus bar. The cured silver rear electrode is qualified under UL 94 V-0 flammability classification and RoHS Directive 2011/65/EU, with sheet resistance measured per ASTM F1896-16. End products include electroluminescent backlights for automotive instrument clusters, appliance indicators, and wearable safety lighting. The principal production bottleneck is not oven residence time but screen clogging when the mixed ink is held beyond 8 h; split-batch mixing is required to hold the addition ratio within ±0.15 wt%.
| Cure peak temperature | Formulation addition ratio | Crosshatch adhesion | Sheet resistance after curing | Observed production behavior |
|---|---|---|---|---|
| 130 °C | 1.2 wt% | 4B per ASTM D3359-23 | ≤35 mΩ/sq/mil per ASTM F1896-16 | Residual solvent detected; dielectric softening at bus-bar edge |
| 140 °C | 1.5 wt% | 5B per ASTM D3359-23 | ≤22 mΩ/sq/mil per ASTM F1896-16 | Stable edge definition; minimal silver migration under 85 °C/85 % RH |
| 150 °C | 2.0 wt% | 5B per ASTM D3359-23 | ≤20 mΩ/sq/mil per ASTM F1896-16 | Higher crosslink density; measurable film shrinkage on 125 μm PET |
Roll-to-roll rotary screen equipment running the DuPont ME780-matched ink at web tensions between 15–25 N requires a lower addition ratio of 0.8–1.2 wt% to preserve bend-radius stability after curing. The printed silver traces are laid down through a 325 mesh rotary screen with 15 μm emulsion thickness and cured in a 130 °C forced-air tunnel for 30 min. Over-curing at this loading level produces a hardening of the trace edge that initiates microcracking when the circuit is flexed around a 10 mm mandrel, while under-curing leaves the binder susceptible to consumer-cleaning solvents. Compliance verification follows IPC/JPCA-4921 for printed electronics and IPC TM-650 2.4.1 for conductor-to-dielectric adhesion, with resistivity measured per ASTM F1896-16. In production, viscosity drift of the mixed ink on the rotary screen is controlled by enclosing the ink reservoir under 30–40 % RH conditioned air, because solvent loss above 45 % RH shifts the effective addition ratio upward by 0.1–0.3 wt% within 4 h. Terminal products include flexible interconnects for printer head cables, camera modules, and disposable medical sensor circuits. The formulation boundary is defined by ink solids content: if solids drop below 70 %, the addition window narrows to ±0.2 wt% and line speed must be reduced to maintain cure completion.
On paper-based UHF RFID antenna webs, the low temperature cure window forces a reduction in crosslinker loading to 0.5–0.9 wt% of total wet ink because paper cannot tolerate the peak oven temperatures used on polyester films. The ink is applied on a reel-to-reel rotary screen line at web speeds between 8–12 m/min, using a 250 mesh nickel screen and 20 μm emulsion. Drying is staged at 70 °C for 10 min, followed by cure at 110 °C for 30 min in a forced-air tunnel with zone-to-zone temperature deviation held below ±3 °C. Paper preconditioning at 45–55 % RH is mandatory; below 40 % RH, the substrate wicks solvent away from the wet ink too rapidly and causes silver migration at the trace edge, while above 60 % RH, retained moisture disrupts crosslinking. The cured antenna must pass read-range performance testing under ISO/IEC 18000-6C and EPCglobal Class 1 Gen 2, with material compliance to RoHS Directive 2011/65/EU. End products include UHF RFID smart labels, inventory tracking tags, and asset management labels. Because paper is dimensionally unstable under thermal load, the ink film is measured for sheet resistance per ASTM F1896-16 after conditioning at 23 °C/50 % RH for 24 h.
Automotive side-view mirror defogger elements impose a different set of boundary conditions, beginning with the requirement that the cured silver trace retain adhesion through 1,000 thermal cycles between −40 °C and +85 °C as specified in IEC 60068-2-14. The curing agent is added at 1.6–2.2 wt% of total wet ink to shift crosslink density upward, because the printed heater must withstand repeated thermal expansion mismatch without delamination. The printing process uses a 250 mesh screen on 175 μm UV-stabilized polyester, followed by a two-stage oven profile: 90 °C for 12 min solvent flash-off, then 145 °C for 25 min crosslinking. Squeegee pressure is maintained at 55–65 N/cm to control wet film thickness, since local thickness variation above ±5 μm produces hot spots during powered operation. Compliance verification includes UL 746B accelerated aging resistance and RoHS Directive 2011/65/EU. Terminal products include fixed-resistance defogger elements for exterior mirrors, PTC heater films for medical warming blankets, and heated automotive camera lenses. The main production bottleneck observed on roll-to-roll lines is viscosity drift of the mixed ink after 8 h, requiring refrigerated ink reservoirs or split-batch mixing to hold the addition ratio within ±0.15 wt%.
In carbon-silver hybrid electrode pastes for disposable electrochemical biosensors, controlled crosslink density is the primary lever for minimizing leachable species while maintaining electrical contact integrity. The curing agent is added at 0.5–1.0 wt% of total wet ink, a lower loading than decorative or conductive trace applications because the cured electrode is not subjected to severe flexural stress. Printing is performed on 250 μm polyethylene terephthalate through a 325 mesh stainless-steel screen with 10 μm emulsion, using a 70 Shore A squeegee at 40–60 mm/s. Cure is completed in a forced-air oven at 100 °C for 30 min, a temperature selected to avoid thermal degradation of adjacent enzyme layers while still reaching sufficient crosslink conversion. In vitro diagnostic qualification references ISO 10993-5:2009 for cytotoxicity and RoHS Directive 2011/65/EU for restricted substances. End products include single-use glucose test strips, cholesterol test strips, and electrochemical biosensor platforms. Long-term implantable contact data for this specific configuration is limited; the material is qualified only for single-use in vitro diagnostic applications. Ionic contamination is controlled at the electronic/EL grade level, with chloride and sulfate extractables monitored by ion chromatography because elevated ion content interferes with reference electrode stability.
| Requirement | Standard or method | Typical acceptance criterion |
|---|---|---|
| Cytotoxicity | ISO 10993-5:2009 | ≥70 % viability after 24 h elution |
| Lead content | RoHS Directive 2011/65/EU | ≤1000 ppm |
| Cadmium content | RoHS Directive 2011/65/EU | ≤100 ppm |
| REACH SVHC | REACH Regulation (EC) No 1907/2006 | <0.1 wt% per SVHC |
| Sheet resistance after cure | ASTM F1896-16 | ≤30 mΩ/sq/mil |
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The Electronic Ink Curing Agent supplied as the DuPont ME780 matching curing agent is an electronic/EL-grade, solvent-borne reactive crosslinker for use with DuPont ME780 electronic ink vehicles. The material is not a standalone ink and is introduced only into the ME780 base ink at a mix ratio specified in the supplier’s lot-specific work instruction. The electronic/EL-grade designation refers to controlled levels of hydrolyzable chloride, sodium, potassium, and sulfate residues that influence leakage current after humid exposure. On a flatbed screen printer with a 0.40 m print stroke and a 75 Shore A squeegee, the activated ink typically exhibits a reduction in tack after 20–35 min at 25 °C, which defines the working pot life. Viscosity at 25 °C measured with a Brookfield DV-II+ Pro at 20 rpm for the curing agent alone is 1.2–2.0 Pa·s using ASTM D2196-20; the mixed system’s complex viscosity under oscillatory shear at 1 Hz is 4–8 Pa·s. These figures are class-typical and not a substitute for lot-specific certificate of analysis data.
Non-volatile content of the curing agent is controlled within 65–72% by weight after 60 min at 105 °C according to ASTM D2369-20. The solvent fraction is blended to support reflow-free thermal cure of the ME780 vehicle and usually contains a high-boiling ester or glycol ether selected to maintain viscosity stability during stoppages of 2–5 min on a 150–230 mesh polyester screen. The dried film may retain ≤0.8% residual solvent after the thermal cure cycle when determined by headspace gas chromatography using ASTM D4526-20. Ionic contamination of the cured film after extraction per IPC-TM-650 2.3.25 is targeted at or below 0.5 µg NaCl equivalent/cm². Batch-to-batch variation in residual sodium has been observed on production lines when the base ink is pre-mixed in stainless steel vessels without passivation; this shifts dielectric leakage current above 1 nA/cm² at 100 V DC in 85 °C/85% RH aging. Use of passivated or glass-lined mixing vessels prevents that shift.
Thermal cure of the activated DuPont ME780 ink is performed in forced-air convection ovens with an exhaust air velocity of 0.5–1.0 m/s across the printed panel. The lower bound of the cure curve is set by the deblocking temperature of the matched curing agent; incomplete cure below this threshold leaves free reactive groups that depress dielectric resistance. The upper bound is limited by thermal quenching of ZnS:Cu electroluminescent phosphor. Exposure above 130 °C for more than 30 min can reduce luminous output by more than 10% relative to a 110 °C baseline. A compliant cure profile starts with 10 min solvent flash at 60–70 °C, followed by 20 min at 110–120 °C and a final 10 min at 125 °C. Oven profiling with a thermocouple attached to the substrate is required because infrared panel surfaces can overshoot by 8–12 °C. The process window is therefore narrower than generic polyester ink systems; a change in oven belt speed of more than 5% without re-profiling is outside the validated range.
On-press experience with three-quarter automatic screen printers running 1200 panels/h indicates that squeegee pressure above 0.09 MPa forces the mixed ink into the mesh and increases transfer thickness by 10–15%; pressure below 0.05 MPa causes starvation and pinholing in the dielectric layer. The acceptable pressure window is bounded by on-press contact angle and rheological recovery, not merely the bench viscometer reading. After a 30 s stop-start cycle, recovery to 80% of the original shear stress at 0.1 s⁻¹ occurs within 45–60 s. Enclosed squeegee assemblies show stable print performance only when the recovered viscosity remains below 12 Pa·s; above this, mesh clogging is observed on 230 mesh polyester.
After full cure, the dielectric overlay prepared from ME780 base ink and the matched curing agent is evaluated on interdigitated comb patterns to detect moisture-driven electrochemical migration. Volume resistivity of the cured dielectric is ≥1×1012 Ω·cm at 500 V DC and 23 °C, using ASTM D257-14. After 85 °C/85% RH aging for 500 h, resistivity may decay by up to 1.5 decades but remains above 1×1010 Ω·cm. Dielectric breakdown of a 25 µm dry film on indium tin oxide-coated polyethylene terephthalate is typically ≥12 kV/mm under ASTM D149-20 using a 50 V/s ramp. Surface insulation resistance after 168 h at 85 °C/85% RH and 50 V DC bias is generally above 1×108 Ω on 0.5 mm pitch comb structures, evaluated with IPC-TM-650 2.6.3.7. The extracted ionic residuals of the electronic/EL grade differ from general-purpose ink hardeners because they are controlled to avoid electrochemical migration between adjacent silver traces.
The following acceptance matrix summarizes typical lot-qualification criteria for the matched curing agent when used in printed EL devices. All values are class-typical or production-control targets and must not be treated as guaranteed specification without the supplier’s batch documentation.
| Property | Method / condition | Acceptance |
|---|---|---|
| Non-volatile content | ASTM D2369-20, 60 min at 105 °C | 65–72% |
| Viscosity, undiluted | ASTM D2196-20, 20 rpm at 25 °C | 1.2–2.0 Pa·s |
| Activated pot life at 25 °C | Brookfield DV-II+ Pro, complex viscosity increase to 20 Pa·s | 20–35 min |
| Residual solvent after cure | ASTM D4526-20 headspace GC | ≤0.8% |
| Ionic contamination | IPC-TM-650 2.3.25, cured film extraction | ≤0.5 µg NaCl equivalent/cm² |
| Volume resistivity | ASTM D257-14 at 500 V DC | ≥1×1012 Ω·cm |
| Dielectric breakdown | ASTM D149-20, 50 V/s, 25 µm dry film | ≥12 kV/mm |
Incompatibility with amine-based additives is documented. Free amines in ancillary adhesion promoters react with the activated curing agent before the stoving step, causing a viscosity plateau and gelled particles above 15 Pa·s within 5 min at 25 °C. This premature crosslinking increases dielectric loss tangent above 0.05 at 1 kHz after cure. Zinc stearate slip agents should not be added without reformulation because carboxylate counterions raise ionic mobility during humid aging and reduce surface insulation resistance below the 1×108 Ω threshold.
The aliphatic amine hardeners commonly used in low-cost conductive inks form amine carbamates upon exposure to carbon dioxide and increase moisture uptake. In contrast, the ME780 matched curing agent uses a blocked-reactive mechanism that releases no amine by-product during stoving, based on Fourier transform infrared spectroscopy tracking of the isocyanate band at 2270 cm−1 after cure. Acid anhydride systems typically require 150–180 °C cure and are not suitable for polyethylene terephthalate film where dimensional shrinkage exceeds 1.5% at those temperatures; the matched system cures below 130 °C, limiting multilayer registration error to ≤0.5% shrinkage. Aromatic isocyanate systems offer low residue but require dry-air storage below −20 °C for unopened cans in some formulations; the matched curing agent can be stored at 5–25 °C in nitrogen-blanketed cabinets.
| Curing system | Pot life at 25 °C | Residual halogen in cured solids | Dielectric breakdown after 85/85 aging | Moisture sensitivity |
|---|---|---|---|---|
| DuPont ME780 matched electronic/EL grade | 20–35 min | ≤50 ppm | ≥10 kV/mm | Open-container nitrogen blanket required above 35% RH |
| Aliphatic amine hardener | 8–15 min | ≤200 ppm | 6–9 kV/mm | Viscosity drift above 2 Pa·s at RH above 50% |
| Aromatic isocyanate | 30–60 min | ≤10 ppm | ≥8 kV/mm | Gassing in open trays above 30% RH |
| Epoxy anhydride | 45–90 min | ≤100 ppm | ≥12 kV/mm | No open-container limit; cure above 150 °C required |
Before mixing with the ME780 base ink, the curing agent is conditioned to 25 ± 2 °C. Mixing is performed in vacuum planetary centrifugal mixers at 2000 rpm for 60 s, followed by 800 rpm for 120 s under −0.08 MPa to remove entrained air. A three-roll mill may be used for paste-like intermediate formulations only after the mixed system has viscosity below 8 Pa·s; roll pressure above 0.3 MPa raises temperature beyond 35 °C and shortens pot life below 15 min. On a twin-screw extruder with L/D 25 and 20 mm screw diameter, material temperature must remain below 60 °C to prevent premature deblocking; barrel zones are normally set at 25 °C, 30 °C, 35 °C, 30 °C, and 25 °C from feed to die.
The cured film has been evaluated on indium tin oxide-coated polyethylene terephthalate, screen-printed silver, and carbon-loaded polyester. Adhesion after crosshatch adhesion testing per ASTM D3359-23 is 4B or 5B on corona-treated polyethylene terephthalate with surface energy above 45 dyn/cm. On polyethylene naphthalate, adhesion is maintained after 85 °C/85% RH for 240 h if a 1 min plasma pre-treatment with 200 W at 13.56 MHz is used. Without pre-treatment, tape-pull adhesion drops to 2B on polyethylene naphthalate after humid aging. Silicone-based release liners should be avoided during stacking because silicone migration reduces surface energy below 38 dyn/cm and produces fisheyes in subsequent dielectric layers.
For electroluminescent lamp backlight panels, the mixed ME780 ink is screen-printed through a 180 mesh polyester monofilament fabric with 10 µm emulsion thickness, a 75 Shore A square-edge squeegee, 0.5 mm snap-off, and 3.0 mm/s print speed. The wet film thickness of 28–35 µm is adjusted to obtain a dry dielectric layer of 18–22 µm. Multilayer registration is maintained within ±50 µm on a 3-CCD camera alignment system. The mixed material is not suitable for piezoelectric or thermal inkjet deposition; its mixed viscosity of 4–8 Pa·s exceeds the typical jetting range of 8–20 mPa·s. Published data for this specific configuration in continuous inkjet systems is limited.
Unopened containers are stored at 5–25 °C in dry, nitrogen-blanketed cabinets. Shelf life from date of manufacture is 9–12 months when maintained below 25 °C. Storage below 5 °C can cause phase separation; reconditioning requires 4 h at 25 °C in a closed container with slow roller mixing at 20 rpm. Once opened, the material should be blanketed with nitrogen and consumed within 30 days to avoid moisture ingress beyond 500 ppm water as measured by ASTM E203-19. If moisture exceeds 500 ppm, the activated ink can form microfoam during screen printing, producing pinholes in the dielectric layer above 0.5 mm diameter in 5% of printed cells under 100× optical inspection.
RoHS compliance is assessed to European Union Directive 2011/65/EU Annex II for the cured printed article; lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE are typically below the maximum concentration values. The matched curing agent is not an article by itself and supplier declarations must be obtained for each lot. Halogen content of the cured solids by EN 14582 combustion ion chromatography is maintained below 900 ppm chlorine, 900 ppm bromine, and 1500 ppm total halogen, as commonly specified under IEC 61249-2-21 for electronic-grade materials. REACH SVHC compliance is confirmed for the applicable candidate list at the date of shipment according to Article 33(2) of EU Regulation 1907/2006.
