| HS Code | 518964 |
| Productname | Jusage Styrene-Isoprene-Styrene (SIS) Block Copolymer 1220 |
| Chemicalname | Styrene-Isoprene-Styrene Block Copolymer |
| Casnumber | 25038-32-8 |
| Appearance | White or light yellow pellets |
| Styrenecontent | 20% |
| Isoprenecontent | 80% |
| Density | 0.92 g/cm3 |
| Meltflowrate | 20 g/10 min (200°C, 5 kg) |
| Tensilestrength | ≥10 MPa |
| Elongationatbreak | ≥700% |
| Hardness | ≤45 Shore A |
| Volatilematter | ≤0.5% |
| Ashcontent | ≤0.2% |
| Molecularweight | ≈100,000 |
| Solubility | Soluble in toluene, cyclohexane, and other nonpolar solvents |
| Solutionviscosity | ≈1200 mPa·s (25°C, 25% toluene) |
As an accredited Jusage Styrene-Isoprene-Styrene (SIS) Block Copolymer 1220 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Jusage SIS 1220 is supplied in 25 kg sealed containers, clearly labeled and securely palletized for industrial transport and storage. |
| Container Loading (20′ FCL) | Jusage SIS 1220 loaded in 20′ FCL: palletized 25 kg bags, shrink-wrapped, strapped, labeled, sealed, with MSDS and shipping documents. |
| Shipping | Jusage SIS 1220 is generally shipped as a non-hazardous thermoplastic elastomer in pellet or crumb form. It is not regulated for transport, with no UN number, hazard class, or packing group. Use moisture-resistant bags, boxes, or bulk containers. Keep cool, dry, and away from ignition sources. |
| Storage | Store Jusage SIS 1220 in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep containers tightly closed when not in use. Protect from moisture and strong oxidizing agents. Avoid dust generation and static discharge. Use proper labeling and secondary containment. Follow local regulations and manufacturer’s safety data sheet recommendations. |
| Shelf Life | Shelf life is 12 months from manufacture when stored in original unopened containers, cool, dry, well-ventilated, away from direct sunlight. |
Hot-melt pressure-sensitive adhesive compounds based on SIS 1220 are prepared in jacketed sigma-blade mixers or corotating twin-screw extruders with an L/D ratio of 24:1 to 40:1. The molten adhesive must be held between 150 °C and 170 °C through blending, transfer, and coating; excursions above 180 °C initiate oxidative chain scission in the isoprene midblock, reducing cohesion and increasing melt color. High-shear mixing above 50 rpm can generate 10 °C to 20 °C of viscous heating above barrel set-point. Extruder profiles are therefore set with a reverse gradient such as 160 °C in the feed zone and 130 °C at the die to compensate. Nitrogen blanketing of the premix vessel is applied when residence time exceeds 60 min. Brookfield viscosity at 160 °C typically ranges from 8,000 mPa·s to 45,000 mPa·s measured with a Thermosel spindle at 10 rpm under ASTM D3236. The styrenic end-block network remains intact below 170 °C, so static shear at 50 °C is retained when the diblock content in the SIS grade does not exceed 30 wt%; higher diblock fractions lower melt viscosity but depress creep resistance in tape stocks.
| Test property | Method | Acceptance range |
|---|---|---|
| Loop tack on stainless steel | ASTM D6195 | 2.0–6.0 N/25 mm |
| 180° peel adhesion | ASTM D3330 Method A | 4.0–8.0 N/25 mm |
| Static shear | ASTM D3654 Procedure A | 24–72 h at 23 °C, 1 kg load |
| Brookfield viscosity at 160 °C | ASTM D3236 | 8,000–45,000 mPa·s |
For coated paper label stocks, SIS 1220 is incorporated at 25 wt% to 35 wt% of adhesive solids. C5 aliphatic hydrocarbon resins with softening points of 95 °C to 110 °C serve as tackifiers at 45 wt% to 55 wt%; naphthenic or white mineral oil at 10 wt% to 25 wt% adjusts wet-out and die-cutting behavior. A hindered phenol/phosphite antioxidant package is added at 0.5 phr to 1.0 phr. Loop tack on stainless steel according to ASTM D6195 is specified from 2.0 N/25 mm to 6.0 N/25 mm, 180° peel adhesion according to ASTM D3330 Method A from 4.0 N/25 mm to 8.0 N/25 mm, and static shear according to ASTM D3654 Procedure A from 24 h to 72 h at 23 °C with a 1 kg load. Cohesive failure is the dominant mode when tackifier loading exceeds 55 wt% or diblock content is high; adhesive residue on the release liner during high-speed die cutting is then attributed to insufficient isoprene midblock entanglement.
Solution coating of SIS 1220-based pressure-sensitive adhesives for medical tape and wound dressing fixation is carried out at 20 wt% to 40 wt% solids in toluene, ethyl acetate, and hexane blends. The polymer is dissolved in a closed stirred vessel at 40 °C to 60 °C, and viscosity at 25 °C measured with a Brookfield RVT spindle 4 at 20 rpm generally falls between 1,000 mPa·s and 5,000 mPa·s before coating. Coating lines use comma-bar or slot-die heads onto siliconized release paper at 15 g/m² to 40 g/m² dry coat weight; drying ovens are zoned at 40 °C, 60 °C, 80 °C, and 110 °C to keep the web below the lower explosion limit while removing residual solvent to below 100 µg/g. For skin-contact articles, ISO 10993-5 and ISO 10993-10 endpoints are evaluated using extracts prepared at 37 °C for 72 h; adhesive components must be selected from FDA 21 CFR 175.105 and FDA 21 CFR 177.1810 inventories when the construction is used as an indirect food-contact label. The unsaturation in the isoprene block permits post-coating electron-beam crosslinking at 20 kGy to 40 kGy, which raises cohesive strength but also lowers loop tack; this trade-off is controlled by limiting the absorbed dose to the minimum required to reach a gel fraction of 30 wt% to 60 wt% according to ASTM D2765. Residual tackifier monomers and low-molecular-weight isoprene oligomers are the primary extractables monitored under USP Chapter 661.1; plasticizer migration into the adhesive layer from PVC medical tubing is minimized by selecting white mineral oil with kinematic viscosity at 40 °C above 30 mm²/s.
In self-adhesive waterproofing membranes and bituminous tapes, SIS 1220 is dispersed into oxidized bitumen at 8 wt% to 15 wt% using a high-shear rotor-stator mixer operating at 3,000 rpm to 5,000 rpm. Mixing temperature is held at 180 °C to 190 °C; below 170 °C the viscosity of the oxidized bitumen prevents wetting of the styrenic domains, while above 200 °C the isoprene block undergoes thermal depolymerization that produces a measurable drop in elastic recovery. The high-shear stage typically lasts 60 min to 120 min, after which the dispersion is checked by fluorescence microscopy for a polymer domain size below 10 µm; larger domains result in a two-phase melt that fails storage stability requirements. Softening point according to ASTM D36 increases by 25 °C to 40 °C at 12 wt% loading relative to neat bitumen, penetration at 25 °C according to ASTM D5 drops from 60 dmm to 30 dmm, and elastic recovery according to ASTM D6084 rises to 60 % to 80 %. Brookfield viscosity at 180 °C measured with a Thermosel at 5 rpm often exceeds 5,000 mPa·s beyond 15 wt% SIS 1220, which reduces pumpability in continuous membrane lines. The critical loading limit is not polymer compatibility alone but the rise in melt viscosity and the separation index measured by EN 13399; without continuous agitation or a sulfur-based stabilizer, SIS-modified bitumen can separate during storage at 180 °C within 24 h.
At the membrane coating stage, the modified bitumen is applied to polyester or glass-fleece reinforcement at 1.0 mm to 1.5 mm thickness. The coating line operates at 10 m/min to 30 m/min; die pressure is controlled below 50 bar to avoid frictional heat that would exceed the 200 °C thermal limit. Low-temperature flexibility is checked by bending at -10 °C after 7 d at 70 °C, and watertightness is assessed under ASTM D1970 for self-adhering polymer-modified bituminous sheet materials used as steep-slope roofing underlayment.
Injection-molding compounds for soft-touch overmolding and phthalate-free toy formulations are produced by melt blending SIS 1220 with polypropylene homopolymer or random copolymer at 10 wt% to 30 wt%. A corotating twin-screw extruder with an L/D ratio of 40:1 and atmospheric venting is operated at 190 °C to 210 °C; the SIS 1220 is fed downstream after the polypropylene is melted to limit residence time and oxidative degradation. At 10 wt% SIS 1220, notched impact strength of polypropylene according to ISO 180/1A increases by a factor of 2 to 3 relative to the neat matrix, while tensile strength according to ISO 527-2 decreases by 10 % to 15 %. At 30 wt% SIS 1220, Shore hardness according to ISO 868 shifts from approximately 92 A to 70 A, and elongation at break exceeds 400 %. The property transition is nonlinear: beyond 25 wt% SIS 1220, a co-continuous or phase-inverted morphology forms, producing a sharp drop in tensile modulus while melt flow rate according to ISO 1133-1 at 230 °C/2.16 kg increases only moderately. Molders must maintain melt temperature below 220 °C and injection speed below 100 mm/s; higher shear heating causes gate blush and surface delamination due to the low cohesive strength of the isoprene-rich phase. Overmolded grips are demolded with surface temperature below 40 °C to prevent tack transfer to the ejector system.
For hygiene elastic film and nonwoven lamination adhesives, SIS 1220 is applied with hot-melt slot-die or spiral-spray systems at 150 °C to 165 °C. Compared with SEBS of equivalent styrene content, SIS 1220 exhibits lower melt viscosity and better wet-out on polyethylene nonwovens, but the oxidative stability of the unsaturation in the isoprene midblock requires that the applicator reservoir be blanketed with nitrogen and that hold time at temperature not exceed 8 h. The material is applied at 3 g/m² to 8 g/m² between nonwoven layers; creep resistance under a static load of 0.5 N/cm at 38 °C is tested in an environmental chamber for 24 h, with acceptable elongation below 20 %. Spray applicators running above 170 °C generate char within 4 h to 6 h in the die tip; this failure mode is caused by gel formation from isoprene double bonds. The lower high-temperature cohesive strength of SIS 1220 relative to SEBS means that elastic laminates subjected to repeated stretching at 200 % elongation may show adhesive failure after 50 to 100 cycles under a modified ISO 527-2 hysteresis procedure. For improved thermal stability, the adhesive is blended with 10 wt% to 20 wt% SEBS, but tack and low-temperature adhesion decrease. These trade-offs are evaluated on pilot-scale diaper lines running at 400 m/min; line stoppages longer than 10 min require the applicator to be purged with fresh adhesive to prevent crosslinked gel from blocking the filter element.
When SIS 1220 is used in radiation-curable pressure-sensitive adhesives, the isoprene midblock participates in electron-beam-induced crosslinking through free-radical recombination at absorbed doses of 10 kGy to 40 kGy. The adhesive is coated onto release liner at 25 g/m² to 50 g/m² and passed through an electron-beam unit operating at 150 kV to 200 kV; oxygen inhibition is controlled by applying a nitrogen flow of 200 m³/h to 500 m³/h across the beam window. Gel fraction according to ASTM D2765 rises from below 10 wt% at 5 kGy to 40 wt% to 60 wt% at 30 kGy, while loop tack according to ASTM D6195 falls from 6.0 N/25 mm to 2.0 N/25 mm over the same dose interval. The dose-to-gel curve for SIS 1220 is nonlinear because the unsaturation in the isoprene block consumes radiation energy through both crosslinking and chain-scission reactions; above 60 kGy the network density becomes excessive and the adhesive loses tack. Published data for this specific configuration is limited, so the upper dose limit is verified by measuring residual isoprene double-bond concentration with Fourier-transform infrared spectroscopy at 890 cm⁻¹ and 965 cm⁻¹. Radiation-crosslinked SIS 1220 pressure-sensitive adhesives are used where solvent resistance and high-temperature shear are required, such as masking tapes for automotive paint-bake cycles at 120 °C to 140 °C.
| Absorbed dose | Loop tack | Gel fraction |
|---|---|---|
| 5 kGy | 6.0 N/25 mm | ≤10 wt% |
| 30 kGy | 2.0 N/25 mm | 40–60 wt% |
| 60 kGy | <1.0 N/25 mm | >70 wt% |
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Jusage SIS 1220 is a linear styrene-isoprene-styrene thermoplastic elastomer supplied as a controlled-viscosity porous pellet. The model designation 1220 identifies a specific slot within the manufacturer’s SIS range, not a direct monomer ratio. Published data for this specific configuration is limited; lot-level values for styrene content, diblock content, melt mass-flow rate, tensile properties, and stabiliser package must be confirmed against the certificate of analysis before scale-up. The primary application window covers hot-melt pressure-sensitive adhesives, hygiene lamination, label and tape coatings, and polymer modification in polyolefin or bitumen systems. The isoprene midblock distinguishes this product from styrene-butadiene-styrene block copolymers through lower plateau modulus, lower glass transition of the rubber phase, and tack development at lower application temperatures. Those properties are accompanied by reduced thermo-oxidative stability, a limitation that governs melt processing conditions and stabiliser selection.
Pellet storage and moisture control form part of the processing boundary. In field-scale production, moisture condensed during warehouse temperature cycling is the most common source of coating defects. When surface moisture exceeds 0.1 wt%, dehumidified hopper drying at 60–70 °C for 2 h is applied before melt processing. Unopened polyethylene-lined packaging should be kept below 40 °C and protected from direct sunlight. The unsaturated isoprene segment is susceptible to slow free-radical oxidation during prolonged storage; stagnation in warm-room silos above 35 °C beyond 30 days is not recommended unless inert-gas blanketing is used. These constraints are more severe than those for SEBS but comparable to other unsaturated SIS grades.
Lot acceptance is typically controlled by melt rheology, mechanical response, and compositional consistency. Melt mass-flow rate is reported under ISO 1133-1:2022 at 200 °C with a 5 kg load; the exact range for the 1220 grade is manufacturer-controlled and varies with diblock content. Tensile strength and elongation at break are measured on compression-moulded sheets according to ISO 37:2017, while hardness is assessed with ISO 48-4:2018. Volatile matter and ash are controlled by ISO 248-1:2021 and ISO 247-1:2018, respectively. Styrene and diblock contents are specification-critical because a relatively small shift in diblock fraction alters pressure-sensitive tack, shear holding, and melt viscosity simultaneously. Public documentation does not define these parameters for all grades; direct substitution without reviewing the COA is therefore a process risk.
| Parameter | Reference method | Relevance to downstream processing |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | Controls hot-melt viscosity, coating speed, and penetration into porous substrates |
| Shore A hardness | ISO 48-4:2018 | Indicates stiffness and cohesive response after microphase separation |
| Tensile strength, elongation at break | ISO 37:2017 | Defines strength retention when used as a macro-polymer modifier |
| Volatile content | ISO 248-1:2021 | Limits outgassing, odour, and bubble formation in coatings |
| Ash content | ISO 247-1:2018 | Detects contamination that can clog melt filters |
| Styrene and diblock content | manufacturer-specified method | Sets tack/cohesion balance and compatibility with tackifiers |
Dynamic mechanical analysis of linear SIS triblock copolymers with similar architecture shows two loss peaks corresponding to the isoprene-rich midblock and the polystyrene end blocks. The low-temperature peak is typically between -55 °C and -45 °C, while the polystyrene glass transition is broadened by microphase mixing and appears above 80 °C. The plateau modulus between these transitions is governed by the styrene content and morphological continuity. For the 1220 grade, published data for this specific configuration is limited; therefore, DMA scans should be conducted on the as-received polymer at 1 Hz and 2 K/min to establish mixing and phase separation before attempting tackifier addition. The glass transition values are not merely descriptive: they control the peel-temperature window and the onset of creep under sustained load.
The isoprene midblock undergoes oxidative chain scission through allylic hydrogen abstraction, with degradation accelerated by high melt temperature and residence time. General polyisoprene oxidation kinetic data place the apparent activation energy near 80–100 kJ/mol, meaning a temperature increase from 170 °C to 200 °C can substantially shorten the gel-free processing window. For SIS hot-melt compounding, practical melt temperatures are therefore held between 150 °C and 180 °C. Twin-screw extruders with L/D 32:1 to 40:1 and vent vacuum below -0.08 MPa are used to limit oxidative gel formation. Hindered phenolic antioxidants at 0.1–0.3 phr and secondary phosphite processing stabilisers at 0.05–0.2 phr are typical in production formulations. When melt temperature exceeds 190 °C for longer than 6 min, field observations on SIS-based lines show viscosity increase and gel-particle generation in the coating die. This temperature-residence boundary is the most severe process limit for the product class and must be validated on the specific line before scale-up.
In hot-melt pressure-sensitive adhesive formulation, the polymer is compounded with tackifier resins, oils, and stabilisers in a high-shear mixer or twin-screw extruder. Hydrogenated hydrocarbon resins with softening points between 90 °C and 110 °C are commonly used at tackifier-to-polymer ratios of 0.8:1 to 1.2:1; highly aromatic resins increase midblock compatibility but reduce shear holding and can cause adhesive darkening. Naphthenic or paraffinic oils at 5–20 phr lower melt viscosity for slot-die or spray application, but oil loading beyond 25 phr reduces cohesive strength and increases the risk of adhesive migration into porous facestocks. The usable formulation window is narrow because the styrenic end blocks must maintain microphase separation; excessive oil or low-softening-point tackifier can dissolve the polystyrene domains and collapse the physical network. Published data for this specific configuration is limited; therefore, adhesive formulations are typically developed through a star-plot design around the manufacturer’s recommended tackifier-oil ratio rather than by single-point substitution.
Slot-die coating of Jusage SIS 1220-based adhesives requires a stable viscosity plateau over the die-face temperature range. Coating lines are commonly operated with die temperatures of 150–170 °C and transfer-hose temperatures no more than 5 °C above the melt set-point. Basis weights for label and tape applications are generally between 15 g/m² and 25 g/m², while hygiene construction adhesives may be applied at 1–5 g/m² by multi-bead or spray systems. Viscosity instability at the coating head produces transverse coat-weight streaks; screen packs with filtration ratings of 100–250 µm are used upstream to remove gel particles. For continuous coating runs longer than 8 h, production experience shows that die-lip build-up becomes the primary source of coating defects unless the die is thermally isolated and purged at intervals. The grade’s melt elasticity can be assessed by dynamic oscillatory rheometry at 160 °C; the crossover frequency and tan delta are used as internal release criteria for coating uniformity. Published data for this specific configuration is limited, so pilot-line rheology and die-pressure measurements are required for new formulations.
Melt cleanliness is monitored by pressure rise across a screen pack with 100 µm nominal retention. A pressure rise greater than 0.5 MPa over 30 min at constant throughput is interpreted as gel formation or contaminant accumulation. This method is more sensitive than visual inspection for detecting microgel in the unsaturated midblock. On production lines, sudden pressure spikes often correlate with a loss of vent vacuum or with barrel temperatures exceeding 185 °C. When gel formation occurs, the first intervention is to reduce the melt temperature and increase the feed-throat nitrogen purge rather than to raise screw speed. Published data for this specific configuration is limited; line-specific pressure profiles are the operational reference.
Under capillary rheometry at 160–180 °C, linear SIS melts display pronounced shear thinning; apparent viscosity may decrease by an order of magnitude between 10 s⁻¹ and 1000 s⁻¹. This non-Newtonian response affects transfer pumping and die flow. Equipment with gear pumps sized for a Newtonian viscosity will underfeed or overfeed when the melt temperature varies by ±5 °C. The recommended control strategy is to hold melt temperature within ±3 °C at the die and to use a melt pump with a pressure-compensated drive. Published data for this specific configuration is limited; rheological data generated on the coated adhesive, not the neat pellet, is more relevant to line control.
In hygiene lamination and elastic attachment applications, the polymer’s low rubber-phase glass transition enables strain recovery after extension. Typical processing is conducted on high-speed lines where adhesive is applied to nonwoven substrates and immediately nipped with elastomeric strands. The adhesive bond must retain room-temperature tack while resisting creep in warm storage. Formulators compensate for the unsaturated midblock by selecting midblock-associating tackifiers and keeping processing temperatures low. Compared with SEBS-based elastic adhesives, the present SIS class provides lower melt viscosity and faster wet-out on low-energy nonwovens but requires antioxidant protection and opaque packaging to prevent UV-initiated yellowing during storage of finished goods.
When a converter evaluates Jusage SIS 1220 as a drop-in replacement for an SBS or SEBS grade, the decision must rest on low-temperature tack, plateau modulus, compatibility with aliphatic tackifiers, and aging resistance rather than nominal Shore hardness alone. Relative to SBS, the isoprene midblock provides lower tensile strength at equal styrene content and superior tack on low-energy plastic film; it also permits lower hot-melt processing temperatures. Relative to SEBS, the unsaturated midblock gives broader solubility in hydrocarbon tackifiers and easier high-shear dispersion, but poor long-term resistance to UV, ozone, and hot air. The product class is therefore most appropriate for pressure-sensitive tapes, labels, and hygiene construction adhesives that are not exposed to sustained service temperatures above 70 °C or outdoor weathering. Because the exact styrene and diblock content of the 1220 grade is not fixed in public literature, a progression from bench-top lamination trials to pilot coating is required before changing incumbents.
Pressure-sensitive performance is evaluated with standard tapes applied to stainless steel panels. PSTC-101 loop tack, PSTC-101 peel at 180°, and PSTC-107 shear are used; the product’s unsaturated midblock typically yields high loop tack at low coating weight but shear results are highly sensitive to diblock content and tackifier softening point. Because no universal numerical performance target can be stated without the coating weight and substrate, each lot is compared against an internal control formulation. Published data for this specific configuration is limited; therefore, performance claims must be generated through statistically designed experiments rather than extrapolated from class averages.
For polymer modification in polyolefin films, the saturated polystyrene end blocks are less compatible with polypropylene than SEBS, while the unsaturated isoprene midblock can interact with polyolefin amorphous regions. Published data for this specific configuration is limited; the usual approach is to compound a masterbatch at 10–30 wt% loading in a co-rotating twin-screw extruder with a flat temperature profile not exceeding 180 °C, then let down into film. The modifier reduces modulus and increases elongation in stretched films, but the unsaturated structure precludes use in hot-fill or retort packaging that must withstand thermal sterilization above 100 °C.
Regulatory documentation for the product class typically covers EU REACH registration, RoHS Directive 2011/65/EU heavy-metal restrictions, and FDA food-contact status only where specific formulated articles are tested under 21 CFR 175.105 or 21 CFR 177.2600. Jusage SIS 1220 should not be assumed to carry direct food-contact clearance; compliance for a finished adhesive article depends on migration testing and the full formulation. Incompatibility is noted with strong oxidizers and with amine-based additives that can accelerate discolouration; acid-functional copolymers may also destabilise the polystyrene domains at processing temperatures.
