In polyolefin labelstock hot-melt pressure-sensitive adhesive compounding, Kraton™ D1113 is first masticated in a heated sigma-blade mixer at 165 °C until a clear melt develops. The polymer exhibits a bound styrene content of 16% and a polyisoprene midblock glass transition temperature near -55 °C, which maintains a low room-temperature plateau modulus for wetting untreated polypropylene. A C5 aliphatic tackifier with a ring-and-ball softening point of 95–105 °C is introduced at 100–130 phr. Naphthenic process oil is metered at 5–15 phr only after the tackifier has fully solubilized, because oil charged directly into the unmasticated elastic melt can produce a two-phase mixture with visible gel specks during slot-die coating.
The compounded melt is held at 170–180 °C under nitrogen blanketing for no more than 45 min before transfer to a hot-melt pressure tank. Brookfield viscosity measured per ASTM D3236 with an SC4-27 spindle at 5 rpm typically falls between 8,000 mPa·s and 20,000 mPa·s at 175 °C, depending on tackifier resin melt viscosity and oil loading. Slot-die coating onto a silicone release liner at a coat weight of 18–22 g/m² is conducted with a gear pump differential pressure below 40 bar; higher internal pressure drops generate shear heating that can raise the melt above the 190 °C oxidative degradation threshold for unsaturated SIS.
Transfer lamination to 60 µm biaxially oriented polypropylene labelstock is followed by conditioning at 23 ± 2 °C and 50 ± 5 % RH for 24 h before adhesive testing. Loop tack is evaluated per ASTM D6195, 180° peel adhesion per ASTM D3330, and shear holding power per ASTM D3654. Because the reported diblock fraction of D1113 is approximately 19%, long-duration shear resistance under warm storage acts as the limiting variable rather than initial tack response. End uses for this configuration include pressure-sensitive labels for high-density polyethylene chemical bottles, where low-energy substrate wetting is required without corona treatment.
What Limits Holding Power on Freezer-Grade Carton Sealing Tapes When Diblock Content Is High?
At -20 °C the polyisoprene midblock of a linear SIS remains above its glass transition temperature, but the composite storage modulus rises sharply if the tackifying resin has a softening point above 100 °C. In freezer-grade carton sealing tape formulations based on D1113, the high diblock content lowers melt viscosity but simultaneously reduces the proportion of load-bearing triblock network. Shear adhesion failure at 40 °C according to ASTM D3654 is therefore the first performance boundary. Endblock reinforcement is introduced via a low-molecular-weight aromatic hydrocarbon resin at 5–10 phr, while the primary tackifier remains an aliphatic C5 resin at 90–120 phr to avoid sacrificing low-temperature loop tack.
The compounding sequence for freezer-grade tape adhesive introduces the endblock resin after the C5 tackifier has been fully melted into the D1113 phase. Reversing this order produces a sea-island morphology in which aromatic resin domains remain undispersed, causing visible striations in the adhesive film and inconsistent peel at -20 °C. Dynamic mechanical analysis per ISO 6721-1 at 1 Hz is used to confirm that the rubbery plateau storage modulus increases with endblock resin loading; published data for this specific configuration is limited, so the transition is verified on a formulation-by-formulation basis. Batch-to-batch variation in tackifier molecular weight distribution can shift holding power by up to 30%, requiring control of resin softening point per ASTM E28 and melt viscosity per ASTM D3236.
| Measured property | Test standard | Relevant process boundary |
|---|
| Melt viscosity | ASTM D3236 | Maximum 20,000 mPa·s at 175 °C for slot-die labelstock coating |
| Loop tack | ASTM D6195 | Wet-out on untreated polypropylene under 23 ± 2 °C and 50 ± 5 % RH |
| 180° peel adhesion | ASTM D3330 | Assessed after 20 min dwell on low-energy polyethylene |
| Shear holding power | ASTM D3654 | Primary failure boundary for high-diblock D1113 at 40 °C under 1 kg load |
| Rubber plateau modulus | ISO 6721-1 | Process control for cold flow resistance below endblock resin upper loading |
In multi-line elastic attachment for disposable hygiene articles, Kraton™ D1113 is applied through an intermittently opening slot-die station at 150–165 °C. The adhesive must exhibit Brookfield viscosity below 10,000 mPa·s at 155 °C per ASTM D3236 to maintain a stable, non-spatter continuous filament at line speeds from 300 m/min to 600 m/min. A diblock-containing SIS such as D1113 contributes to that low viscosity, but the same diblock fraction reduces elastic strand creep retention when the finished hygiene article is stored at 40 °C under compressive packing loads.
Typical multi-line formulations use a C5 aliphatic tackifier at 100–120 phr, a naphthenic or white mineral oil at 10–20 phr, and a hindered phenolic antioxidant at 1 phr. Application weight per elastic strand is held between 2 g/m² and 5 g/m²; lower add-ons produce adhesive starvation at the strand-to-nonwoven interface, while higher add-ons increase bleed through onto the polyethylene backsheet. Production-scale creep retention testing uses a static load of 500 g for 4 h at 40 °C, with residual creep above 30% triggering reformulation because it indicates insufficient triblock network density. Published data for this specific hygiene construction is limited, and end-user specifications are normally validated by creep retention protocols rather than adhesive peel data alone.
Heat stability is monitored at 175 °C for 72 h, with viscosity change required to remain below 10% per ASTM D4499. Char accumulation on melter filter packs is inspected after each production campaign; excessive gel formation is traced to hold-time excursions above 180 °C or contamination of the tackifier with acid-functional resins that accelerate SIS chain scission. Because D1113 is unsaturated in the polyisoprene midblock, antioxidant selection must include a phosphite co-stabilizer to protect against melt processing oxidation without inducing discolouration of the adhesive line.
When D1113 Is Dissolved in Toluene–Ethyl Acetate Blends for Automotive Masking Tape Adhesives
Solventborne pressure-sensitive adhesives based on D1113 are prepared by dissolving the polymer at 25% solids in a 70:30 toluene–ethyl acetate blend in a closed reactor with anchor stirring at 40–60 °C. The resulting lacquer is compounded with a stabilized rosin ester tackifier at 80–110 phr and a hindered phenolic antioxidant at 1 phr. The solution is coated onto crepe paper masking tape substrate with a comma roll or slot die, dried in a zoned oven from 80 °C to 110 °C, and conditioned to residual solvent below 0.1% by gas chromatography. Solvent recovery and lower explosive limit monitoring are mandatory because the toluene–ethyl acetate vapour mixture falls under EU Directive 2010/75/EC VOC emission controls and requires ATEX zoning for the coating room.
Masking tapes for automotive refinish are expected to peel cleanly from painted steel after a 130 °C bake cycle for 30 min without ghosting or adhesive transfer. Peel adhesion is measured per ASTM D3330 after bake, while loop tack is measured per ASTM D6195 at 23 °C. The low styrene content of D1113 limits adhesion build on polar waterborne acrylic paints, but the same property reduces stiffening of the tape edge during high-temperature bake cycles. A formulation using more than 15 phr of low-molecular-weight endblock resin raises the 130 °C debonding force but increases the probability of adhesive residue on clearcoat surfaces; published data for this specific automotive masking configuration is limited, so each paint system requires end-use adhesion and ghosting trials.
Aluminium foil scrim tapes for HVAC duct sealing are coated with a D1113-based hot melt at 170–180 °C through a slot die onto foil web that has been corona pre-treated to a surface energy of at least 44 dyn/cm. The adhesive requires immediate wet-out on oxidized aluminium, which is favoured by the low polystyrene endblock content of D1113. Aliphatic C5 tackifier at 100–130 phr is used; aromatic modification is limited to 10 phr because higher aromatic content raises 180° peel adhesion but accelerates UV embrittlement of the exposed adhesive edge. The coated foil is laminated with a scrim reinforcement and then wound under controlled tension to prevent telescoping and adhesive transfer to the foil reverse side.
HVAC duct tapes are tested for 180° peel adhesion per ASTM D3330 on stainless steel and for low-temperature application at -10 °C; both test methods reveal whether the adhesive remains pressure-sensitive after storage in unconditioned warehouses. Flame propagation of the laminate may be evaluated under UL 723 or equivalent building product codes in specific end-use specifications, but the D1113 formulation itself is not flame retarded, and the addition of halogen-free flame retardants above 20 phr typically produces a discontinuous adhesive melt and uneven transfer coat weight. Process limitations include die lip contamination from carbonized adhesive at start-up after weekly shutdowns; heated purge cycles at 180 °C for 20 min are employed to re-stabilize the melt film before production line speed is restored.
Rheological Benchmarks for Low-Viscosity Graphic Film Mounting Adhesives
Graphic film mounting adhesives based on D1113 are formulated to combine low melt viscosity with high initial tack on rigid PVC, cast vinyl, and polyethylene terephthalate film surfaces. The polymer content is maintained at 25–35 wt% of the final compounded adhesive, with a tackifier blend of aliphatic C5 resin and hydrogenated rosin ester at 100–140 phr relative to polymer. A liquid hydrocarbon extender at 5–10 phr is added to reduce Brookfield viscosity below 12,000 mPa·s at 165 °C per ASTM D3236, preventing distortion of thin mounting films during hot-melt slot-die coating. The adhesive is applied at 20–25 g/m² to a silicone release liner, then transfer-laminated to the graphic film at nip pressures below 3 bar to avoid adhesive strike-through on porous media.
Outdoor durability of graphic films places a separate constraint on the unsaturated polyisoprene midblock of D1113. Without UV stabilization, edge yellowing and adhesive embrittlement occur after extended sunlight exposure. A hindered amine light stabilizer and a UV absorber are therefore pre-dispersed into the tackifier phase before polymer mastication, at total loadings of 0.5–1.5 phr. Accelerated weathering under ISO 4892-2 xenon-arc conditions is used to compare edge discolouration against a control, and the adhesive is evaluated for cold flow at 50 °C by measuring creep under static load. Published data for this specific D1113 graphic mounting configuration is limited, but the formulation strategy follows the same endblock reinforcement and antioxidant stabilization logic applied to low-temperature tape adhesives.
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Kraton™ D1113 is a linear styrene-isoprene-styrene triblock copolymer supplied as porous pellets and used as a base polymer in hot-melt pressure-sensitive adhesives, solvent-borne adhesives, and sealants. The grade is characterized by a styrene content of 16 % by weight and a diblock content of 18 % by weight. The phase-separated morphology consists of polystyrene end-block domains dispersed within a continuous polyisoprene matrix. This architecture produces low modulus, high elongation, and lower melt viscosity than higher-styrene SIS grades. Typical properties published in the manufacturer technical data sheet include specific gravity 0.92 (ASTM D792-20), melt mass-flow rate 24 g/10 min at 200 °C / 5 kg (ASTM D1238-20), tensile strength 4.0 MPa (ASTM D412-16), elongation at break 1,300 % (ASTM D412-16), and Shore A hardness 10 (ASTM D2240-15).
The polyisoprene midblock contributes tack and extension, while the polystyrene end-blocks act as physical crosslinks at service temperature. At processing temperatures above the polystyrene glass transition, the endblock network relaxes and the material behaves as a thermoplastic melt. This reversible network permits compounding without vulcanization. However, the unsaturated isoprene midblock is sensitive to thermal oxidative degradation. Melt temperature, residence time, and stabilizer selection therefore constitute the principal processing boundaries.
What Limits Melt Processing Windows for Low-Styrene SIS Block Copolymers?
Compounding of D1113 on a co-rotating twin-screw extruder with an L/D of 40:1 typically uses barrel settings from 140 °C to 170 °C. At screw speeds above 300 rpm, viscous dissipation can raise melt temperature above the set point, making die melt-temperature monitoring necessary. The reported melt mass-flow rate of 24 g/10 min at 200 °C / 5 kg corresponds to low melt viscosity suitable for slot-die, roll, and spray application. Hot-melt processing is normally conducted at 160–180 °C. Above 200 °C, chain scission of the polyisoprene midblock accelerates, and carbonyl formation can be monitored by FTIR near 1720 cm−1. Below 140 °C, incomplete relaxation of the polystyrene end-block domains can leave gel-like unmelted regions and produce melt fracture. Nitrogen blanketing, antioxidant addition, and residence times below 2 h are standard precautions on continuous lines. Stabilizer packages combining a hindered phenolic primary antioxidant with a phosphite secondary antioxidant at 0.1–0.5 wt% are used to maintain melt viscosity stability.
Tackifier selection changes phase behavior in D1113 formulations. Aliphatic C5 hydrocarbon resins and hydrogenated rosin esters are compatible with the polyisoprene midblock; aromatic C9 resins interact with the polystyrene end-block domains and can raise melt viscosity while reducing low-temperature tack. At resin loadings of 40–60 wt%, the adhesive remains pressure-sensitive and displays measurable peel. Naphthenic oil at 10–20 phr reduces melt viscosity for spray, roll, and slot-die application. Oil loading above 25 phr can cause phase separation and surface migration, especially in polyethylene film laminates. A representative hot-melt PSA may contain D1113 at 40 wt%, hydrogenated rosin ester at 50 wt%, naphthenic oil at 10 wt%, and stabilizer at 0.5 wt%.
| Property | Test Method | Typical Value | Unit |
|---|
| Styrene content | Internal GPC method | 16.0 | % |
| Diblock content | Internal GPC method | 18.0 | % |
| Specific gravity | ASTM D792-20 | 0.92 | – |
| Melt mass-flow rate | ASTM D1238-20, 200 °C / 5 kg | 24 | g/10 min |
| Tensile strength | ASTM D412-16 | 4.0 | MPa |
| Elongation at break | ASTM D412-16 | 1,300 | % |
| Hardness | ASTM D2240-15, Shore A | 10 | Shore A |
D1113 melt rheology is shear-thinning. In a hot-melt slot-die coater, apparent viscosity at 170 °C can fall below 10 Pa·s at shear rates above 1,000 s−1. Spray-grade formulations require viscosity below 2 Pa·s; this is achieved by oil dilution and controlled melt temperature rather than by overheating. Overheating generates gel. In-line filtration through a 100 μm mesh or candle filter is recommended, and filter-pressure rise above 10 bar indicates gel accumulation. For label stock, coat weights of 20–35 g/m² are common. For diaper-tape and medical-tape constructions, coat weights of 40–60 g/m² are typical. Peel adhesion is determined by resin type, coating weight, and backing stiffness, not solely by the SIS base polymer.
When D1113 Is Selected Over D1111 or D1119 in Hot-Melt PSA
In formulations requiring low melt viscosity and high elongation, D1113 is selected over D1111. D1111 contains 22 % styrene and approximately 18 % diblock, producing higher cohesive strength and higher melt viscosity. D1119 is characterized by a significantly higher diblock content reported in vendor literature as 66 %. That high diblock fraction reduces network continuity and lowers plateau modulus, which improves rapid surface wetting but reduces shear resistance. D1113 at 16 % styrene and 18 % diblock occupies an intermediate position: the endblock network remains intact while diblock content provides controlled reduction in cohesive strength. For tape adhesives, 180° peel values of 2–6 N/25 mm are achievable depending on formulation and backing when tested per ASTM D3330 or PSTC-101. Static shear values are backing- and formulation-specific; published data for this specific configuration is limited and should be generated on the intended substrate.
Peel, loop tack, and shear are measured on coated laminates per ASTM D3330, ASTM D6195, and ASTM D3654. Loop tack values for D1113-based formulations are highly dependent on coating weight and resin softening point. With a C5 tackifier softening point of 90–100 °C, loop tack can exceed 15 N/25 mm at coat weights above 30 g/m² in fully optimized screening formulations; however, published data for this specific configuration is limited. Static shear on stainless steel is often limited by cohesive failure of the adhesive rather than interfacial release. Shear adhesion failure temperature per ASTM D4498 can be used to rank formulations; for D1113 with 50 wt% tackifier, values below 75 °C frequently indicate diblock-induced network weakening.
Solvent-Borne Adhesive Viscosity and Film Formation Constraints
Solvent-borne adhesives prepared with D1113 use toluene, xylene, or cyclohexane/aliphatic blends. At 25 % solids in toluene, solution viscosity is typically below 3 Pa·s, but the actual value depends on diblock content, solvent quality, and temperature. Dissolution is performed with high-shear dispersion followed by low-shear agitation for 2–4 h at 25–40 °C. Solutions are protected from light and air; 0.1 wt% antioxidant prevents viscosity drift during storage. Coated films on polyester or polypropylene require surface treatment such as corona discharge to achieve wetting. In solvent sealants, D1113 is compounded with calcium carbonate, precipitated silica, and tackifier. Residual solvent must be controlled below 0.5 % in the dried film to avoid blistering and loss of cohesive strength.
| Requirement | Reference | Relevance to D1113 |
|---|
| REACH polymer registration exemption | EC 1907/2006, Article 2(9) | The polymer is exempt from registration when constituent monomers are registered; confirm with the supplier regulatory datasheet. |
| Food-contact adhesive use | 21 CFR 175.105 | Adhesives may comply when formulated with permitted components; D1113 alone does not provide a compliance guarantee. |
| RoHS II restricted substances | Directive 2011/65/EU | Raw polymer does not contain lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE above homogeneous material thresholds; supplier declaration is required. |
| Melt flow quality control | ASTM D1238-20, Procedure A | Melt mass-flow rate is used as a production quality-control parameter. |
| Tensile and elongation | ASTM D412-16 | Mechanical property specification for cast films and elastomer sheets. |
Storage of D1113 pellets requires dry, well-ventilated conditions below 35 °C. The polymer is not hygroscopic, but condensation on cold pellets can introduce moisture and cause splay during melt processing. Pre-drying at 60 °C for 2 h in a desiccant dryer is recommended when pellets have been stored at relative humidity above 60 %. Avoid combination with amine-based additives that can accelerate oxidative degradation of the polyisoprene midblock. The solid polymer has a flash point above 300 °C; molten material can ignite if exposed to open flame. Spilled pellets should be collected and disposed of according to local regulations.
