| HS Code | 827780 |
| Product Name | Photolithography Monomer |
| Chemical Class | Acrylate monomer |
| Cas Number | Varies by specific monomer type |
| Molecular Weight | Varies by specific monomer structure |
| Purity | ≥98% |
| Viscosity | 10-50 mPa·s at 25°C |
| Refractive Index | 1.45-1.50 |
| Uv Absorbance | Low (<0.05 at 365 nm) |
| Glass Transition Temperature | Varies by polymerized form |
| Solubility | Soluble in organic solvents; insoluble in water |
| Boiling Point | >200°C |
| Flash Point | >100°C |
| Density | 1.05-1.15 g/cm³ |
| Storage Condition | Store at 2-8°C, protected from light |
As an accredited Photolithography Monomer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Photolithography Monomer, 100 g, packaged in an amber glass bottle with PTFE-lined cap, sealed under nitrogen for stability. |
| Container Loading (20′ FCL) | 20′ FCL: photolithography monomer in sealed UV-blocked drums, palletized and strapped, inert nitrogen purge, temperature-controlled, protected from light and moisture. |
| Shipping | Photolithography Monomer requires strict temperature control, light protection, and inert atmosphere packaging to prevent polymerization. Ship via ground or air with UN-compliant hazard labeling, avoiding extreme heat and moisture. Use dedicated, grounded containers; include Safety Data Sheet. Ensure incoterms and customs documentation clearly identify the chemical for regulatory clearance. |
| Storage | Store Photolithography Monomer in a cool, dry, well-ventilated area, tightly sealed in its original container. Protect from light, UV radiation, heat, and ignition sources. Keep away from oxidizers, acids, and peroxides. Under inert gas blanketing is recommended to prevent oxygen and moisture exposure. Ensure proper grounding and bonding to avoid static accumulation. |
| Shelf Life | Store in a cool, dark, dry place under inert gas. Shelf life is typically 12 months from manufacture date. |
The 193 nm immersion resist segment relies on poly(meth)acrylate matrices in which the photolithography monomer is incorporated as a dissolution inhibitor carrier, etch-resistance carrier, and aqueous base developer switch. In a typical ArF resist polymer, the monomer feed contains a nonpolar alicyclic unit such as 2-methyl-2-adamantyl methacrylate at 20–45 mol%, a polar gamma-butyrolactone methacrylate or 3-hydroxy-1-adamantyl methacrylate at 10–30 mol%, and a protected acid-labile tert-butyl methacrylate or 2-ethyl-2-adamantyl methacrylate at 15–40 mol%; the balance may be alkyl methacrylate spacer. The formulation addition ratio of residual free monomer in the final liquid resist is controlled below 100 ppm after high-vacuum devolatilization to avoid dark-film shrinkage and outgassing during exposure. Industry compliance for this segment intersects REACH Regulation (EC) No 1907/2006 Annex XVII restrictions on low-molecular-weight methacrylate monomers, RoHS Directive 2011/65/EU Annex II where lead and cadmium are absent, and ISO 14644-1:2015 Class 3 or better for sub-10 nm wafer environments. Downstream production occurs on coater/developer tracks such as TEL Lithius or DNS S65 systems; spin coating of a 90–150 nm film is followed by soft bake at 100–130 °C for 60–120 s, exposure on an ArF excimer laser scanner with immersion numerical aperture above 1.0, post-exposure bake at 110–130 °C for 60–90 s, and puddle development with 0.26 N tetramethylammonium hydroxide. The process window at the PEB step is typically narrower than ±2 °C; deviations produce acid diffusion changes that alter critical dimension by several nanometers and increase line-width roughness. Terminal finished products include positive-tone ArF dry and immersion resists for logic nodes at 7 nm, 5 nm, and 3 nm design rules, as well as production of DRAM and 3D-NAND memory layers where etch selectivity against carbon hardmask is critical. Storage and formulation boundaries are strict: acid-labile ester monomers hydrolyze if water contamination exceeds 500 ppm in casting solvent, and combination with amine-based additives above part-per-million threshold prematurely neutralizes photoacid generator activity.
For redistribution-layer processing, the photolithography monomer is formulated into a negative-tone thick-film resist in which the addition ratio of difunctional to trifunctional acrylate monomers controls both crosslink density and plating resistance. A typical high-throw coating formulation uses a combined multifunctional acrylate monomer addition ratio of 15–35 wt% of total photosensitive solids, with the trifunctional component limited to 5–12 wt% to prevent crack formation after copper plating thermal stress. Compliance is evaluated under REACH Regulation (EC) No 1907/2006 Annex XVII, RoHS Directive 2011/65/EU Annex II, and ASTM D3359-17 cross-cut adhesion on copper and polyimide surfaces. Downstream manufacturing uses spin coating or spray coating to build 5–50 µm wet films, followed by prebake at 100–140 °C, broadband UV exposure at 365 nm on a mask aligner or stepper, post-exposure bake at 80–120 °C, and development in propylene glycol monomethyl ether acetate. The patterned dielectric must withstand acid copper sulfate electroplating at pH below 1, followed by resist stripping in alkaline solution. The operational boundary is narrow: carboxyl-rich monomers improve copper adhesion but become incompatible with strongly alkaline zincate pre-treatment baths used on aluminum bond pads, causing delamination and underplating. Terminal finished product types include redistribution layers for fan-out wafer-level packaging, copper pillar bumps with diameters below 40 µm, through-silicon via interposers, and microbump pad arrays on high-density memory substrates.
Dry film photoresists for high-density interconnect are processed on vacuum lamination equipment, where the photolithography monomer addition ratio must balance aqueous developing speed, resolution, and etch resistance. The monomer fraction in a nitro-free alkaline-developable dry film typically falls between 25 wt% and 45 wt% of the dry film binder, with monofunctional reactive diluents such as ethoxylated bisphenol A diacrylate or trimethylolpropane triacrylate used to control double-bond conversion and crosslink density. Industry compliance references include RoHS Directive 2011/65/EU Annex II, REACH Regulation (EC) No 1907/2006 Annex XVII, and ASTM D3359-17 for copper-clad laminate adhesion. Downstream production begins with vacuum lamination at surface temperatures between 100 °C and 120 °C, followed by exposure with a laser direct imaging system at 405 nm or conventional UV contact printing at 365 nm. Development is carried out with 1.0 wt% sodium carbonate solution at 30 °C in a spray chamber, after which the panel enters cupric chloride or alkaline etching; the resist is stripped in 3–5 wt% sodium hydroxide at 50 °C. The main processing conflict is that higher acrylate monomer loading improves resolution below 25 µm line/space but reduces thermal stability during gold plating and solder mask cure. Terminal finished product types include HDI boards with microvia structures, IC substrates for flip-chip packages, flexible printed circuits with polyimide substrates, and package-on-package interposers. Pre-drying of the laminate is required at relative humidity above 60%; otherwise moisture carried into the dry film interface causes wedge-shaped delamination during development.
| Application segment | Critical compliance reference | Process-critical test method or equipment | Key operational boundary |
|---|---|---|---|
| ArF immersion resist | REACH (EC) No 1907/2006 Annex XVII; RoHS 2011/65/EU Annex II; ISO 14644-1:2015 Class 3 | 0.26 N TMAH puddle development on TEL Lithius track | PEB window ±2 °C; free monomer residue <100 ppm |
| Advanced packaging thick film | REACH (EC) No 1907/2006 Annex XVII; RoHS 2011/65/EU Annex II; ASTM D3359-17 | 365 nm broadband mask aligner; acid copper sulfate electroplating | Trifunctional monomer limited to 5–12 wt% to prevent Cu plating cracks |
| PCB dry film | RoHS 2011/65/EU Annex II; REACH (EC) No 1907/2006 Annex XVII; ASTM D3359-17 | 405 nm laser direct imaging; 1.0 wt% Na₂CO₃ spray development at 30 °C | Lamination surface temperature 100–120 °C; avoid amine-bearing carrier films to prevent premature gelation |
| Display panel photoimageable layer | RoHS 2011/65/EU Annex II; REACH (EC) No 1907/2006 Annex XVII; ISO 14644-1:2015 Class 5 | Slit coating with ±3% wet film uniformity; g/h/i-line mask exposure; 2.38% TMAH development | Pre-drying required above 60% RH for color filter glass |
| MEMS and microfluidics thick resist | REACH (EC) No 1907/2006 Annex XVII; RoHS 2011/65/EU Annex II; ISO 14644-1:2015 Class 5 | Multi-coat spin processing; 365 nm UV cure; PGMEA development | Film thickness above 50 µm requires two-step prebake to avoid solvent popping |
| UV-nanoimprint lithography | REACH (EC) No 1907/2006 Annex XVII; RoHS 2011/65/EU Annex II; ISO 14644-1:2015 | Drop-on-demand dispensing; UV-LED 365 nm cure | Monomer viscosity below 20 mPa·s at imprint temperature; oxygen suppression below 100 ppm O₂ |
Gen 6 display array fabrication introduces a wet-etch sequence in which the positive-tone acrylate monomer content must remain low enough to prevent crack formation after indium tin oxide deposition and high enough to provide adhesion to sputtered ITO. In photosensitive color filter and black matrix formulations, the addition ratio of acrylate monomer as binder and crosslinking precursor is typically between 8 wt% and 20 wt% of total photosensitive solids, with multifunctional monomer limited to 3–8 wt% because higher crosslink density increases residue after ash stripping. Compliance statements are anchored to RoHS Directive 2011/65/EU Annex II for indium tin oxide and chromium-free black matrix layers, REACH Regulation (EC) No 1907/2006 Annex XVII for monomer components, and ISO 14644-1:2015 Class 5 for display cleanroom coating areas. Downstream production occurs on slit coaters that apply 2–5 µm wet films to Gen 6 substrates, followed by prebake at 90–120 °C, g/h/i-line mask exposure at 100–300 mJ/cm², development with 2.38% tetramethylammonium hydroxide, and wet etch of ITO or black chromium. The process conflict is that adhesion-promoting carboxyl acid monomers can saponify in alkaline developer and leave organic residue on the ITO surface, shifting contact angle and affecting subsequent polyimide alignment layer spreading. Terminal finished product types include TFT-LCD color filter arrays, black matrix grids with subpixel tolerances below ±2 µm, and OLED pixel define layers where the cured acrylate must survive vacuum thermal evaporation of organic emissive materials.
When film thickness exceeds 10 µm, low-stress epoxy acrylate monomer systems become the governing variable in micromolding and MEMS sacrificial-layer processes. The addition ratio of epoxy acrylate monomer in high-aspect-ratio photoresist is typically 30–50 wt% of the formulation solids, with viscosity adjusted by reactive diluents to achieve 1,000–3,000 mPa·s before spin coating. Compliance for microfluidic medical components may reference REACH Regulation (EC) No 1907/2006 Annex XVII, RoHS Directive 2011/65/EU Annex II, and ISO 14644-1:2015 Class 5 for particle-controlled processing. Downstream manufacturing uses single or multi-coat spinning to form films from 10 µm to 100 µm, with two-step prebake at 65 °C and 95 °C required above 50 µm to prevent solvent popping. Exposure is performed on a mask aligner at 365 nm with doses from 200 mJ/cm² to 1,000 mJ/cm² depending on thickness, followed by post-exposure bake at 65–95 °C and development in propylene glycol monomethyl ether acetate. The patterned resist serves as a sacrificial mold for electroplating or as a structural layer for microfluidic channels. The operational boundary is that high epoxy monomer fractions increase sidewall verticality but reduce elongation at break, leading to cracking during thermal cycling or DRIE stress. Terminal finished product types include microfluidic dies with channel heights above 50 µm, inkjet nozzle plates, microlens arrays, and micro-actuator structural layers. Published data for specific monomer ratio-to-sidewall-angle correlations in noncommercial MEMS formulations is limited; batch-to-batch variation in epoxy equivalent weight must be controlled within ±5% to maintain repeatable development clearance.
UV-nanoimprint lithography monomer performance is measured not only by cure speed but by demolding force and residual layer control, making low-viscosity monofunctional acrylates the dominant species in the imprint resist. The addition ratio of monofunctional acrylate monomer is typically 50–70 wt%, with difunctional crosslinker at 10–25 wt%; the low viscosity below 20 mPa·s at imprint temperature is required for picoliter droplet filling. Compliance references include REACH Regulation (EC) No 1907/2006 Annex XVII, RoHS Directive 2011/65/EU Annex II, and ISO 14644-1:2015 cleanroom classification depending on final optical component handling. Downstream production uses drop-on-demand dispensing onto a template, room-temperature or low-temperature imprinting at 20–60 °C, UV cure at 365 nm under nitrogen blanket below 100 ppm O₂, and de-molding followed by residual layer etching in an inductively coupled plasma etcher. The main processing conflict is that oxygen inhibition at the resist-air interface prevents full cure of monofunctional acrylate and increases demolding force; therefore, the nitrogen blanket is not optional. Terminal finished product types include diffractive waveguides for augmented reality headsets, photonic integrated circuit patterns, micro-optical diffusers, and master molds for high-throughput roll-to-roll replication. Published data for this specific configuration is limited for production-scale photonic waveguide use, but the viscosity and oxygen inhibition thresholds are documented in nanoimprint resist supplier technical bulletins.
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The product designated PM-193M is an alicyclic methacrylate monomer supplied for chemically amplified photoresist formulations used in 193 nm argon-fluoride laser lithography and, as a co-monomer, in selected 248 nm krypton-fluoride resist systems. The primary function of PM-193M is to provide an acid-labile 2-methyl-2-adamantyl ester protecting group; upon protonation during post-exposure bake, the tertiary ester is cleaved, and the resulting polarity change converts the exposed resin from developer-insoluble to soluble in 0.26 N aqueous tetramethylammonium hydroxide developer. PM-193M is controlled under a gas chromatographic assay target of ≥ 99.0 area% using a 30 m × 0.25 mm fused-silica capillary column with flame ionization detection. Water content is limited to ≤ 100 µg/g by ASTM E203-21 volumetric Karl Fischer titration, and acid value is limited to ≤ 0.3 mg KOH/g by ASTM D974-22. Density at 25 °C is specified as 1.05 ± 0.01 g/cm³ by ASTM D4052-19, and kinematic viscosity at 25 °C is specified as 4.00 ± 0.20 mm²/s by ASTM D445-21. The low ultraviolet absorbance of the alicyclic backbone distinguishes PM-193M from aromatic vinyl monomers such as styrene or 4-hydroxystyrene; aromatic groups, while acceptable at 248 nm, absorb too strongly at 193 nm and reduce dose latitude. PM-193M is not a general-purpose acrylate intermediate and is not compatible with amine-cured or free-radical industrial coating systems without a radical inhibitor adjustment.
Conventional aliphatic acrylate monomers such as methyl methacrylate or glycidyl methacrylate are formulated for optical clarity and thermal polymerization, but they are not refined for trace metal control, low water content, or plasma etch resistance. In 193 nm photoresist polymers, the alicyclic adamantane moiety of PM-193M contributes to low absorbance and to dry-etch resistance against fluorocarbon plasma chemistries, whereas conventional aliphatic esters tend to show higher erosion rates under the same oxide-etch conditions. The acid-cleavable tertiary ester of PM-193M also provides high dissolution-rate contrast in 0.26 N tetramethylammonium hydroxide; typical non-lithographic acrylates do not undergo a comparable polarity switch and therefore produce excessive dark loss if used in positive-tone chemically amplified resists. The comparative specification targets are shown in the following table.
| Property and test method | PM-193M | General-purpose aliphatic acrylate |
|---|---|---|
| Assay by GC-FID | ≥ 99.0 area% | ≥ 98.0 area% |
| Water content, ASTM E203-21 | ≤ 100 µg/g | ≤ 500 µg/g |
| Acid value, ASTM D974-22 | ≤ 0.3 mg KOH/g | ≤ 1.0 mg KOH/g |
| Kinematic viscosity at 25 °C, ASTM D445-21 | 4.00 ± 0.20 mm²/s | 2.00 ± 0.50 mm²/s |
| Density at 25 °C, ASTM D4052-19 | 1.05 ± 0.01 g/cm³ | 1.01 ± 0.02 g/cm³ |
| Total trace metals by ICP-MS | ≤ 100 ng/g | ≤ 10,000 ng/g |
In high-volume 300 mm wafer manufacturing, PM-193M-containing methacrylate resists are typically dispensed through 0.1 µm polytetrafluoroethylene filters and coated on a coater/developer track to film thicknesses of 110 nm to 130 nm. The dissolution-rate contrast is assessed by a development rate monitor after exposure at 193 nm; formulations containing PM-193M at 20 mol% in the polymer repeat unit exhibit an unexposed film-thickness loss of less than 2 nm in 0.26 N aqueous tetramethylammonium hydroxide over 60 s, whereas the exposed film clears within the same interval. This contrast is not achievable with general-purpose acrylate monomers because their low glass transition temperature and high developer uptake produce unacceptably high dark loss. The result is usable linewidth roughness only after the resin is re-engineered with fluorinated or alicyclic co-monomers, which increases formulation complexity compared with PM-193M use.
PM-193M is processed through a three-stage purification sequence: fractional distillation under reduced pressure below 1.0 kPa, passage through a packed column containing acid-scavenging and metal-chelating media, and terminal filtration through a 0.05 µm fluoropolymer membrane. Trace metal analysis is performed by inductively coupled plasma mass spectrometry after closed-vessel sample digestion; the lower reporting limit for sodium, iron, calcium, zinc, and aluminum is 5 ng/g. The specification requires total trace metals ≤ 100 ng/g and individual alkali and alkaline earth metals ≤ 25 ng/g. By contrast, general-purpose acrylate monomers may contain total trace metals in the 1,000 ng/g to 10,000 ng/g range, which is unacceptable for 193 nm photoresist because residual metal ions interfere with photoacid generator dissociation and can shift threshold voltage. Acid value reduction follows the same logic: residual methacrylic acid in PM-193M above 0.3 mg KOH/g can neutralize photogenerated acid and alter post-exposure bake latitude. The purified monomer is transferred under nitrogen into fluoropolymer-lined 1 L, 4 L, and 20 L containers; headspace oxygen is maintained below 5 % v/v to limit autoxidation and peroxide accumulation.
When PM-193M is polymerized in a 50 L jacketed reactor with 2,2′-azobis(2-methylpropionitrile) as initiator, the monomer feed is usually maintained at 18 °C to 22 °C while the reactor contents are held at 75 °C with a nitrogen sweep of 0.5 L/min. A monomer feed rate above 1.0 kg/h in this vessel has been associated with temperature excursions of 4 °C to 6 °C and increased low-molecular-weight oligomer formation; the resulting resist polymer can show a broadened molecular weight distribution and inconsistent line edge roughness. Published batch data for this specific production configuration is limited, but the sensitivity of the polymerization to feed-rate variation is well documented for methacrylate copolymer systems. Filtration after polymerization through a 0.1 µm ultrahigh-molecular-weight polyethylene filter is required before spin-coating to remove microgel particles and aggregated catalyst residues.
PM-193M is stabilized with 20 ppm to 50 ppm 4-methoxyphenol and should be stored at 5 °C to 15 °C. Storage below 5 °C does not degrade the monomer but can reduce inhibitor solubility and create localized zones of insufficient stabilization during thawing; therefore, low-temperature storage requires slow warming to 25 °C under nitrogen with gentle agitation for at least 12 h before use. Water uptake during storage is controlled by keeping the container sealed until thermal equilibration is reached; ASTM E203-21 water content should be rechecked after any high-humidity opening because the lactone-containing co-monomer PM-LM30 is hygroscopic. The product must not be combined with amine-based additives or alkaline-neutralizing agents because alkaline species consume the photoacid generator and inhibit deprotection. Compatibility with triphenylsulfonium photoacid generators is limited to concentrations below 5 wt% relative to total solids; higher photoacid generator loadings can generate excessive acid concentration in the exposed film and reduce process window.
At ArF immersion formulation scales, adding the polar co-monomer PM-LM30 at 15 mol% to 25 mol% of total polymer repeat units raises the static water contact angle of the resist film by 3° to 8° depending on topcoat type; contact angle is measured by sessile drop using ASTM D7334-08, with a water droplet volume of 5 µL. PM-193M alone produces the acid-cleavable hydrophobic switching unit, but it does not provide sufficient developer wetting for 45 nm half-pitch contact holes; PM-LM30 contributes lactone polarity and reduces microbridge defects. The two monomers are usually dissolved in propylene glycol methyl ether acetate at 25 °C to 30 °C with impeller mixing for 30 min to 45 min, then filtered through a 0.1 µm ultrahigh-molecular-weight polyethylene filter. The difference from conventional methyl methacrylate is the retention of dry-etch resistance; the adamantane group in PM-193M exhibits a silicon dioxide etch selectivity higher than 1.2:1 when tested under a fluorocarbon plasma with 1,200 W source power and 400 W bias power.
Acid generation in PM-193M-containing resists is typically driven by triphenylsulfonium triflate or triphenylsulfonium perfluorobutanesulfonate; the acid liberated during exposure diffuses through the polymer matrix during post-exposure bake. The degree of deprotection depends on bake temperature and time, commonly 110 °C to 130 °C for 60 s to 90 s on a hotplate with a ramp rate of 25 °C/s. If the residual acid value of PM-193M exceeds 0.3 mg KOH/g, methacrylic acid impurities neutralize a portion of the photogenerated acid and require a higher post-exposure bake temperature to reach the same deprotection level, thereby increasing the diffusion length and degrading line edge roughness. The specification limit on acid value is therefore not a storage formality but a lithographic process boundary. Residual moisture above 100 µg/g in PM-193M can quench photoacid generator radical cation states and reduce exposure sensitivity by an estimated 2% to 5% per 100 µg/g water increase, according to published resist formulation data. Counterion selection is also constrained because perfluorobutanesulfonate diffuses more slowly than triflate, giving lower line edge roughness but requiring higher exposure dose; the monomer purity does not eliminate this balance but determines whether the selected photoacid generator operates within its intended acid-generation range.
For direct-write electron-beam lithography using PM-193M-based resists, exposure doses in the range of 20 µC/cm² to 50 µC/cm² at 100 keV are commonly used. The same acid-labile deprotection chemistry operates, but the higher energy deposition produces secondary electron distributions that increase the deprotection efficiency at pattern edges, leading to dense-line resolution below 50 nm half-pitch. However, published process data for this specific monomer in electron-beam imaging is limited; transferability of ultraviolet-derived dissolution rates should not be assumed. The product can also be employed in low-outgassing resists for extreme ultraviolet exposure, but outgassing screening under high vacuum requires a dedicated witness plate test and residual gas analysis because low-molecular-weight byproducts from deprotection may deposit on multilayer optics. The operational boundary is not the monomer itself but the total formulation outgassing budget under vacuum exposure.
