Asahi Kasei Asaprene™ SBS T-411XL
- Product Name: Asahi Kasei Asaprene™ SBS T-411XL
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Asahi Kasei Asaprene™ SBS T-411XL is typically used in formulations when melt flow rate and styrene content and processing temperature and shear rate must be controlled within specific ranges.
| HS Code | 696767 |
| Polymer Type | Styrene-butadiene-styrene (SBS) block copolymer |
| Polymer Architecture | Linear |
| Styrene Content | 30 wt% (typical) |
| Butadiene Content | 70 wt% (typical) |
| Density | 0.94 g/cm³ (typical) |
| Melt Flow Rate | 5 g/10 min at 200 °C/5 kg (typical) |
| Shore A Hardness | 70 (typical) |
| Tensile Strength | 20 MPa (typical) |
| Elongation At Break | 700% (typical) |
| 300 Modulus | 2 MPa (typical) |
| Solution Viscosity | 1,500 mPa·s at 25 °C in 25 wt% toluene (typical) |
| Volatile Matter | ≤0.5 wt% |
| Ash Content | ≤0.2 wt% |
| Appearance | White crumb or pellet |
As an accredited Asahi Kasei Asaprene™ SBS T-411XL factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Asahi Kasei Asaprene™ SBS T-411XL is typically packaged in 25 kg moisture-resistant bags, palletized for safe industrial handling. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with Asahi Kasei Asaprene™ SBS T-411XL in sealed bags, palletized and secured for ocean shipment. |
| Shipping | Asahi Kasei Asaprene™ SBS T-411XL is typically shipped as non-hazardous thermoplastic elastomer pellets in 25 kg moisture-barrier bags on pallets. It is not classified as dangerous goods for transport. Keep dry, cool, and protected from direct sunlight, prolonged heat, and humidity during storage and transit. |
| Storage | Store Asahi Kasei Asaprene™ SBS T-411XL in original, sealed packaging in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat, flames, and oxidizing materials. Protect from moisture, dust, and contamination, and avoid prolonged storage at elevated temperatures. Follow good warehouse practice and first-in, first-out stock rotation. |
| Shelf Life | Shelf life is approximately 24 months when stored cool, dry, and in original unopened packaging. |
At Which Dispersion Temperature Does the SBS Network Invert in Paving-Grade Bitumen?
Bitumen modification with Asaprene™ SBS T-411XL is conducted as a sequenced heat and shear process. The base bitumen is charged into a jacketed vessel and heated to 160–175 °C before polymer addition. T-411XL pellets are fed at a controlled rate into a rotor-stator high-shear mixer. Dispersion is continued for 45–90 min after the final polymer addition. During this stage the SBS phase absorbs maltenes and swells. Phase inversion from bitumen-continuous to polymer-network morphology depends on shear history and polymer dosage. The mixture is then transferred to a low-shear maturation tank. If the transfer occurs before the network has formed, elastic recovery remains below specification. After transfer, the polymer-modified bitumen is held at 120–150 °C to limit thermal degradation.
Dosage in paving-grade binders is normally 3–5 wt% of total binder mass. At 2 wt%, network continuity is uncertain. Above 6 wt%, viscosity can approach the upper limit of spray equipment and tanker pumps. Roofing membrane compounds may use higher polymer levels up to 12 wt% depending on low-temperature flexibility targets. Low-temperature flexibility is assessed after heat aging. Service temperature and crack resistance are evaluated by EN 1109 cold bending and EN 13398 elastic recovery. Storage stability is checked by EN 13399 with a maximum permissible difference in softening point usually set by national road authorities. European supply chains also require REACH registration under Regulation (EC) No 1907/2006.
| Parameter | Typical control | Standard |
|---|---|---|
| Polymer dosage | 3–5 wt% | EN 14023 |
| High-shear mixing temperature | 170–190 °C | Plant line trial |
| Elastic recovery at 25 °C | ≥70% | EN 13398 |
| Storage stability Δ softening point | ≤5 °C | EN 13399 |
| Low-temperature cold bending | Grade-dependent pass temperature | EN 1109 |
Terminal products include heavy-duty road paving binders, bridge deck waterproofing compounds, airport apron mastics, and SBS-modified bituminous roofing membranes. In roofing sheet manufacture, the modified bitumen is compounded with filler and reinforcement before coating onto polyester or glass-fibre carriers. Published data for T-411XL in this specific configuration is limited; plant-scale dispersion trials define the final rotor-stator settings.
Because residual moisture in SBS pellets can create steam during closed-mixer compounding, pre-drying is addressed before T-411XL is charged. Surface moisture above 0.1 wt% can cause gel-like defects. Pre-drying at 60–70 °C for 2–4 h is applied when pellet inventory has been exposed to high humidity.
A starting formulation range for label and tape applications is T-411XL 20–30 wt%, C5/C9 hydrocarbon tackifier 40–55 wt%, naphthenic or paraffinic oil 15–25 wt%, and hindered phenolic antioxidant 0.3–0.8 phr. The polymer is charged first; tackifier and oil are added incrementally after the SBS phase has melted. Mixing is performed in a vertical sigma-blade or horizontal double-arm mixer at 150–180 °C under inert gas. Holding above 200 °C for more than 20 min may cause chain scission and a drop in static shear. Discharge is performed through a heated filter or gear pump.
Viscosity is checked by ASTM D3236 at 180 °C; loop tack by ASTM D6195; peel by ASTM D3330; shear by ASTM D3654. Food packaging adhesive compliance is determined under 21 CFR 175.105 only when all formulation components meet the applicable food-contact listing. Terminal products include pressure-sensitive tapes, paper labels, hygiene assembly adhesives, and removable protective films. Batch-to-batch viscosity variation is commonly observed with recycled tackifier streams; frequency of torque monitoring should be increased for high-speed coating lines.
Microcellular Sole Expansion: Blowing Agent Decomposition and Melt Rupture Limits
Injection moulding of microcellular soles from T-411XL compounds requires balancing blowing agent decomposition with melt strength. Compounds are prepared by pre-blending SBS with crystal polystyrene, naphthenic oil, calcium carbonate, and azodicarbonamide in a high-speed mixer. The compound is then pelletized on a co-rotating twin-screw extruder. Barrel temperatures are maintained at 150–180 °C with the die at 170–185 °C. In the injection unit, melt temperature is held at 160–185 °C and mould surface temperature at 30–50 °C. Blowing agent loading of 1.0–2.0 phr generates density reductions from a solid value of roughly 0.95–1.05 g/cm³ to 0.50–0.70 g/cm³, depending on shot size, back pressure, and venting.
Expansion beyond a ratio of 1:1.6 without increased SBS content produces internal blowholes and split surfaces. Nucleation is controlled by back pressure; large shots require higher azodicarbonamide decomposition residue. Abrasion is measured by ISO 4649; hardness by ISO 7619-1; density by ISO 2781. Terminal products include athletic shoe midsoles, casual footwear unit soles, and expanded sheet replacements for EVA foam. The processing window is narrow; mould fill speed and gate dimensions determine whether the expanding melt tears at knit lines.
When Impact Modification of General-Purpose Polystyrene Shifts from Polybutadiene to SBS Triblock
When T-411XL is evaluated as an impact modifier for general-purpose polystyrene, co-rotating twin-screw compounding is used. The extruder L/D ratio is 36:1–44:1. The temperature profile is set from 150 °C at the feed throat to 190 °C at the die; melt temperature above 210 °C promotes oxidative gelation, visible as black specks and die drool. SBS addition of 5–15 wt% changes the Izod impact failure mode from brittle to ductile. The exact transition depends on SBS block structure, mineral oil level, and screw rpm. At 10 wt% loading, extruder torque typically rises 8–15% relative to virgin GPPS; drive motor sizing and screw torque safety margin should be verified before scale-up.
The compound is pelletized and molded for testing. Notched Izod impact is measured by ISO 180/1A or ASTM D256; melt volume-flow rate is measured by ISO 1133-1; Vicat softening temperature is measured by ISO 306. Terminal products include opaque appliance housings, toy components, office equipment, and extruded profiles. The formulation is not recommended for thin-wall transparent packaging because SBS domains increase haze and reduce light transmission.
For solvent-borne construction mastics, T-411XL is dissolved in aromatic or mixed aliphatic/aromatic solvents. The polymer is added under high-speed dispersion at 20–35% non-volatile solids. The polymer solution is then compounded with calcium carbonate, precipitated silica, hydrocarbon resin, and antioxidant. Polymer content in the dried film is 20–35 wt%. Slump resistance is measured by ISO 7390, and elastic recovery by ISO 7389. Peel adhesion to concrete and aluminum is screened by ASTM C794. Solvent retention in thick sections may exceed 10 wt% if the mastic is tooled too early; this delays cure and reduces early modulus.
In cold climates, solvent release is slower and mastics may require heated substrate or forced ventilation. VOC content is assessed under Directive 2004/42/EC where applicable. The extended diblock phase, if present, softens the compound and increases pressure-sensitive tack but lowers cohesive strength at elevated temperature. Datasheet values for T-411XL diblock content should be used to predict this balance. Terminal products include metal roof repair mastic, construction joint filler, and vibration damping compounds.
Extruding SBS-Modified Polystyrene Sheet for Thermoformed Packaging and Industrial Trays
Extruded sheet made from T-411XL-modified polystyrene requires a melt pump to control thickness variation. The formulation uses GPPS 70–90 wt%, T-411XL 10–30 wt%, mineral oil 0–5 wt%, and processing stabilizer 0.1–0.3 phr. Barrel profile is 160–200 °C from hopper to melt pump. Die temperature is 190–200 °C. The roll stack is set from 60–80 °C to minimise surface haze and stress. Thermoforming temperatures are 110–130 °C for the sheet surface. Draw ratios above 2:1 may cause local thinning when SBS content is below 15 wt%. The formed parts are tested for drop impact by ASTM D2463 and tensile strength by ASTM D638. For food-contact sheet, Regulation (EU) No 10/2011 applies to the finished article and migration testing is required. Terminal products are packaging trays, industrial dunnage, and reusable handling trays.
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- Asahi Kasei Asaprene™ SBS T-411XL is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: sales8@ascent-chem.com.
Commercially supplied as a porous pellet or crumb, Asahi Kasei Asaprene™ SBS T-411XL is a linear styrene-butadiene-styrene triblock copolymer produced by sequential anionic polymerization. The bound styrene content is 31 wt% when measured to ISO 5478:2008, and the specific gravity is 0.94 g/cm³ to ASTM D792-20. The grade is not oil-extended, and the residual diblock content is typically below 1% by the manufacturer’s in-house GPC method. Melt-mass flow rate at 190 °C with 2.16 kg load falls in the 0.1–0.4 g/10 min range to ASTM D1238-20, which places T-411XL in the high-molar-mass segment of the Asaprene SBS portfolio. Representative mechanical values from manufacturer technical literature include tensile strength of 29 MPa, elongation at break of 750%, and hardness of 84 Shore A to ASTM D638-14 and ASTM D2240-15. These values are representative lot averages and are not to be interpreted as specification limits.
| Property | Method / regulation | Representative value / status |
|---|---|---|
| Bound styrene | ISO 5478:2008 | 31 wt% |
| Specific gravity | ASTM D792-20 | 0.94 g/cm³ |
| Melt-mass flow rate | ASTM D1238-20 at 190 °C/2.16 kg | 0.1–0.4 g/10 min |
| Tensile strength | ASTM D638-14 | 29 MPa |
| Elongation at break | ASTM D638-14 | 750% |
| Hardness | ASTM D2240-15 | 84 Shore A |
The combination of high molar mass and low diblock content gives T-411XL a pronounced elastic network under deformation, but it also restricts melt flow under low shear. The practical consequence is that the grade is more suitable for applications requiring high melt strength, elastic recovery, and bitumen modification than for thin-wall injection molding where flow length is the limiting variable. Compared with lower-molar-mass linear SBS grades, T-411XL produces higher die swell and higher solution viscosity at equal solids. In toluene at 25 wt% solids, Brookfield solution viscosity commonly exceeds 3,000 mPa·s at 25 °C, whereas general-purpose linear SBS grades may fall below 2,000 mPa·s. Published data for the exact solution-viscosity specification of T-411XL is limited to manufacturer technical literature.
What separates the XL designation from standard SBS grade nomenclature?
The XL suffix refers to an elevated molar-mass grade rather than crosslinking or oil extension. The distinction is rheological: at 190 °C and 2.16 kg, the melt-mass flow rate is approximately one order of magnitude lower than easy-flow SBS grades used in thin-wall injection molding. High molar mass increases chain entanglement density and zero-shear viscosity, which improves cohesive strength in adhesives and elastic recovery in asphalt modification. It also raises the energy input needed for plastication. On a co-rotating twin-screw extruder with L/D 48:1, barrel set points of 150–190 °C are common, but the measured melt temperature can exceed 210 °C at screw speeds above 250 rpm on a 40 mm screw because of viscous shear heating. Processing should therefore be controlled by melt-temperature monitoring rather than barrel set point alone.
In TPE-S compounds where T-411XL is blended with polypropylene, oils, and fillers, typical specific energy input is 0.18–0.24 kWh/kg. Die pressure should remain below 12 MPa to avoid excessive melt temperature and strand breakage at pelletizing. The high viscosity of T-411XL can reduce the dispersion of high-viscosity additives if the screw profile has insufficient mixing elements. Published data for this specific configuration is limited, but production experience with similar high-molar-mass SBS grades indicates that two or three kneading blocks downstream of the oil injection port are required for uniform oil absorption.
Compounding, shear heating, and regrind tolerance
Thermal degradation in SBS is accelerated by repeated extrusion and by stagnation at high temperature. The butadiene midblock is susceptible to oxidation and gel formation when melt temperature is held above 210 °C for more than 5 min. In production-scale compounding, regrind addition above 15 wt% without a fresh antioxidant masterbatch has been observed to reduce elongation at break and increase gel count, though published data for the exact grade is limited. For compounds containing hygroscopic fillers, pre-drying at 60–80 °C for 2–4 h is recommended when ambient relative humidity exceeds 60%. Neat T-411XL is not hygroscopic, but surface moisture can produce foam and surface defects in extrusion.
Chemical incompatibilities include strong acids, strong oxidizers, and aromatic solvents. Aromatic and chlorinated solvents swell or dissolve the styrene and butadiene phases, respectively, and should be avoided in processing and service. Mineral oils should be selected for paraffinic or naphthenic character; highly aromatic process oils can plasticize the styrenic domains and reduce upper service temperature. Amine-based additives are not generally recommended because they can interact with the antioxidant package and may promote discoloration during high-temperature compounding.
When melt strength requirements exceed standard injection-molding grades
In blown film, sheet, and profile extrusion, T-411XL provides higher bubble stability and lower draw resonance than lower-molar-mass SBS because the elevated zero-shear viscosity increases melt strength. The trade-off is that thin-wall injection molding is constrained by flow length. Parts with flow length/thickness ratio above 150:1 frequently require melt temperatures of 195–205 °C and enlarged gates. Mold temperature between 20 °C and 50 °C is typical for TPE-S compounds; lower mold temperatures reduce cycle time but can increase molded-in stress and warpage in thick sections. Clamp force requirements are generally lower than for rigid engineering thermoplastics, but cavities with long projected areas may still require 4–6 t/in² of projected area when processing high-viscosity compounds.
The high melt viscosity of T-411XL also affects hot-melt adhesive application. Slot-die coaters require melt temperatures of 165–185 °C and hydraulic pressure sufficient to maintain 0.05–0.15 MPa at the die; lower-viscosity grades are preferred when continuous spray patterns are required. The advantage of T-411XL in adhesives is higher cohesive strength and improved heat resistance once the styrenic domains re-form on cooling.
In paving-bitumen modification, T-411XL is incorporated at 4–7 wt% into 60/70 or 80/100 penetration-grade bitumen using a high-shear rotor-stator mill at 175–185 °C. The high molar mass increases the softening point measured to ASTM D36-14 by 8–15 °C compared with unmodified bitumen and improves elastic recovery to ASTM D6084-18. Storage stability is assessed by comparing softening point between the top and bottom of a 72 h, 163 °C tube test; differences above 2.5 °C indicate phase separation. T-411XL generally produces lower top/bottom separation than low-molar-mass SBS grades at equal loading because the higher molecular weight forms a continuous polymer-rich network more readily. Bitumen moisture should be below 0.2% before polymer addition to avoid foaming and inconsistent dispersion.
For footwear and soft-touch compounds, T-411XL is typically formulated with polystyrene and paraffinic oil at rubber loadings of 25–40 phr. The resulting compounds show tensile set below 20% after 200% elongation when conditioned and tested to ASTM D412-16. The high molar mass contributes to abrasion resistance and flex fatigue, but it also increases mixing torque. Manufacturers using internal mixers should monitor ram position and batch temperature; prolonged mixing above 170 °C can cause premature gel formation and viscosity drift.
Regulatory documentation for T-411XL is available for REACH Annex XVII restricted substances and RoHS directive 2011/65/EU with lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE limits. Food-contact applicability requires assessment under FDA 21 CFR §177.1810 or equivalent national legislation; the grade is not universally pre-certified for all food types. End users must validate migration limits for the intended food-contact configuration. Sustained service temperature above 70 °C may cause creep unless the styrenic phase is reinforced or crosslinked. Outdoor exposure without carbon black or hindered amine light stabilizer can result in surface crazing from ultraviolet oxidation of the butadiene midblock.
