| HS Code | 673295 |
| Softening Point Ring Ball | 85 °C |
| Color Gardner | <1 |
| Acid Value | <0.1 mg KOH/g |
| Melt Viscosity At 180 C | 300 mPa·s |
| Density At 20 C | 1.06 g/cm³ |
| Glass Transition Temperature | 45 °C |
| Number Average Molecular Weight Mn | 650 |
| Weight Average Molecular Weight Mw | 950 |
| Polydispersity Mw Mn | 1.5 |
| Bromine Number | <1 g/100g |
| Refractive Index At 20 C | 1.51 |
| Flash Point | >200 °C |
As an accredited NOVARES PURE 85 AS Hydrogenated Resin for High-Performance PSA factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | NOVARES PURE 85 AS hydrogenated resin for high-performance PSA is supplied as pastilles in 25 kg bags, with palletized quantities. |
| Container Loading (20′ FCL) | 20′ FCL loading: NOVARES PURE 85 AS hydrogenated resin, palletized and secured for safe transport in high-performance PSA applications. |
| Shipping | Ship as non-hazardous solid resin, packaged in sealed multi-layer bags or drums to prevent contamination and moisture absorption. Store away from heat, sparks, and ignition sources. Avoid prolonged exposure to sunlight; keep dry. Transport in ventilated, covered containers, protecting packages from physical damage and extreme temperatures. |
| Storage | Store NOVARES PURE 85 AS in its original, tightly sealed container in a cool, dry, well-ventilated area. Avoid direct sunlight, heat sources, and open flames. Keep away from oxidizers and moisture. Maintain moderate temperatures to prevent softening or degradation. Proper storage ensures stability and performance in high-performance PSA applications. |
| Shelf Life | Shelf life is typically 24 months from production date when stored unopened in original container below 25°C. |
Hot-melt pressure-sensitive adhesive lines for biaxially oriented polypropylene (BOPP) carton sealing tape and laser die-cut label stock compound NOVARES PURE 85 AS at 30–50 wt% of total adhesive solids, with the exact loading governed by the required shear adhesion failure temperature (SAFT) measured under ASTM D 4498. The hydrogenated tackifier, with a ring-and-ball softening point of 85 °C per ASTM D 6493 and a molten Gardner colour below 1, shifts the plateau modulus of SIS/SBS networks upward without raising the glass transition temperature above the pressure-sensitive window when observed by oscillatory rheometry at 150 °C and 10 rad/s. Compliance for food-contact packaging adhesives falls under FDA 21 CFR 175.105 and, where applicable, EU 10/2011 migration limits; the resin is REACH-registered. Downstream coating on slot-die hot-melt coaters operates at 145–165 °C with coat weights of 18–25 g/m²; co-rotating twin-screw extruders with an L/D ratio of 48:1 and screw speeds of 180–220 rpm are used for pre-compounding. Higher barrel temperatures above 180 °C initiate oxidative yellowing and viscosity drift despite the AS stabilizer package. A process conflict arises when low-viscosity formulations require more than 35 wt% tackifier: die-lip build-up increases due to low molecular weight fractions, and coater operators compensate by raising melt temperature, which narrows the processing window to ±5 °C. Batch-to-batch variation in resin melt viscosity at 160 °C is typically below ±8% when measured by ASTM D 3236; silo-to-silo transfer of flaked material under high-humidity conditions above 60% RH requires pre-drying to avoid steam-induced pinholes. Terminal product types include transparent carton sealing tape, laser die-cut paper labels, and removable warehouse tags. Published data for this specific product in low-g/m² label transfer lines is limited, so pilot trials are required to establish coat-weight lower limits.
| Formulation variable | Low resin loading | Standard loading | High resin loading | Test method |
|---|---|---|---|---|
| NOVARES PURE 85 AS concentration (wt% of total solids) | 20–30 | 30–40 | 40–50 | ASTM D 6493 |
| 180° peel adhesion on stainless steel (N/25 mm) | 6.0–8.5 | 8.0–11.0 | 8.5–10.5 | ASTM D 3330 Method F |
| Loop tack (N) | 12–15 | 10–13 | 7–9 | ASTM D 6195 |
| Shear adhesion failure temperature, 500 g/in² (°C) | 62–68 | 68–74 | 74–80 | ASTM D 4498 |
| Brookfield viscosity at 160 °C (mPa·s) | 800–1,200 | 1,200–1,800 | 1,800–2,500 | ASTM D 3236 |
In disposable diaper leg cuff and adult incontinence side panel construction, the hydrogenated tackifier is added at 20–40 wt% relative to the combined styrenic block copolymer, plasticizer, and tackifier solids. The primary processing conflict lies in the viscosity ceiling of Nordson-style gear pump melters, which cannot deliver clean spiral-spray patterns above 2,500 mPa·s at 150 °C; because the 85 °C softening point raises melt viscosity compared with lower-softening-point resins, loadings above 40 wt% force either higher application temperatures or the addition of white oil, each of which compromises elastic strand integrity. Compliance for hygiene construction adhesives is framed by EDANA/INDA NWSP 110.4.R0 for 180° peel and ISO 9073-3 for nonwoven tensile loss, while skin-contact articles are subject to voluntary OECD 439 in vitro irritation screening rather than medical device classification. Production runs on high-speed lamination lines with air-assisted multi-bead nozzle heads at 150–165 °C, coat weights of 3–8 g/m² in elastic attachment zones, and line speeds up to 400 m/min; batch-to-batch viscosity variability must remain below ±8% to avoid nozzle clogging and intermittent peel. Terminal product types include leg cuffs, stretch ears, waistbands, and acquisition layer adhesives. At the lower addition ratio below 20 wt%, creep resistance in body-temperature load conditions (38 °C, 500 g static shear) declines due to insufficient network reinforcement; published comparative data for this specific product in nonwoven spray applications is limited, so pilot trials with the actual melt delivery system are required before line qualification.
Medical tape and epidermal wearable sensor adhesive formulations use NOVARES PURE 85 AS at 20–35 wt% of total adhesive solids in SEBS/medical white oil systems, where the hydrogenated resin functions as a mid-block tackifier to raise static shear without increasing extractable aromatic content. Biological evaluation follows ISO 10993-1:2018 endpoint selection, ISO 10993-5:2009 for cytotoxicity, and ISO 10993-10:2010 for skin sensitization and irritation; USP Class VI testing under USP <88> may be required for direct patient-contact dressings under selected regulatory submissions. The adhesive is coated at 120–150 °C onto polyethylene or polyurethane films via closed-path slot-die coaters at 25–50 g/m², followed by gamma or ethylene oxide sterilization validation. Process failure modes include low-molecular-weight resin migration into the liner after 24 h at 40 °C, which is controlled by limiting the resin addition to 35 wt% and by pre-drying at RH above 60%. Terminal products are wound care tapes, wearable electrocardiogram sensor mounts, and surgical drape edge strips. The addition ratio must be reduced to 10–15 wt% in very soft skin-contact gels because the 85 °C softening point raises the plateau modulus and can trigger skin trauma during removal; this trade-off is verified by peel force measurements under ASTM D 3330 and by skin adhesion trials following ISO 29862 Method 1.
| Standard | Designation | Method/clause | Boundary applied |
|---|---|---|---|
| ISO 10993-1:2018 | Biological evaluation of medical devices | Clause 5.1 endpoint selection | Required for wearable skin-contact adhesive |
| ISO 10993-5:2009 | Cytotoxicity | Extract dilution method | Required for all skin-contact candidates |
| ISO 10993-10:2010 | Skin sensitization/irritation | Patch testing, 4 h exposure | Required for repeated wear devices |
| USP <88> | Biological reactivity, in vivo | Class VI systemic injection | Optional depending on regulatory submission |
| ASTM D 3330 | Peel adhesion | Method F, 180° | Release and skin trauma verification |
When wire harness bundling tapes and headliner attachments must meet low-VOC interior air specifications, the tackifier loading is set at 25–45 wt% in SIS/SEBS hot-melt systems, with the lower boundary set by static creep at 80 °C and the upper boundary set by fogging condensate limits. Emission compliance is assessed under VDA 278:2011 thermal desorption for VOC and FOG fractions, with typical OEM specifications requiring total VOC below 100 µg/g and fog condensate below 250 µg/g; odour is evaluated under VDA 270:2018 and UV colour stability under SAE J2412. Downstream compounding uses co-rotating twin-screw extruders with an L/D ratio of 52:1, vacuum venting at −0.08 MPa, and melt temperatures of 140–170 °C before slot-die coating onto PET nonwoven, EPDM foam, or PVC carrier webs at 40–80 g/m². A process conflict occurs when the resin addition exceeds 45 wt%: the glass transition of the styrene phase is diluted, lowering low-temperature peel at −20 °C below the OEM requirement, while loadings below 25 wt% result in edge lifting on wire harness tapes after 72 h at 80 °C. Terminal product types are fabric wire harness tapes, headliner clips, interior trim bonding tapes, and door panel sound-deadening laminates. Published data for this specific product in full-scale VDA 278-compliant lines is limited; therefore, production qualification requires pilot-scale batch testing with the actual carrier and adhesive coat weight.
For cast vinyl signage films and temporary architectural protective films, NOVARES PURE 85 AS is compounded at 15–30 wt% of total adhesive solids, with the upper limit constrained by the appearance of haze under ASTM D 1003 after 1,000 h QUV exposure. The low aromatic content and stabilizer package maintain colour shift below ΔYI 2 in accelerated weathering under ASTM G154 Cycle 1, while outdoor colourfastness is benchmarked against ISO 105-B02 blue wool scale of at least 6. Production laminates the adhesive to calendered PVC or polyethylene films on multi-roll coaters at 130–160 °C, with coat weights of 10–20 g/m²; for exterior protective films, the carrier is often co-extruded with a UV-blocking top layer to reduce adhesive degradation. Terminal product types include architectural window protective film, stone lintel protection film, signage vinyl laminates, and temporary paint protection films. The resin is not recommended for high-polarity acrylic formulations above 20 wt% because phase separation creates hazy patches detectable under ASTM D 523 gloss measurements; if higher loadings are needed, a compatibility trial with the specific acrylate grade must be completed. Published comparative data for this product in exterior vertical exposure is limited, so field trials under ISO 2810 are preferred over laboratory-only qualification.
In PCB conformal coating and powder coating masking, NOVARES PURE 85 AS is compounded at 20–35 wt% in rubber-resin adhesive systems, where the 85 °C softening point improves holding power at 160 °C short-duration bake cycles but limits knife-over-roll coating to a melt temperature window of ±5 °C around 135 °C. Compliance under RoHS 2011/65/EU and IPC-A-600 electronic assembly cleanliness reviews requires the adhesive to leave no ionic residue after mask removal; the hydrogenated hydrocarbon resin contributes low chloride content and is free of intentionally added silicone, but release liner interaction must be tested under ASTM D 2578 surface energy methods to avoid transfer of polydimethylsiloxane species. Production uses heated calender or knife-over-roll coating for solventless adhesive, followed by slitting at tape widths of 3–25 mm; terminal product types are conformal coating masking discs, powder coating masking tapes, and high-temperature splice tapes used in flexible circuit assembly. A process conflict arises at loadings above 35 wt% because the adhesive becomes too stiff for clean removal from FR-4 boards and leaves edge residue, while below 20 wt% the tape fails to survive 30 min at 160 °C. Published data for this specific product in lead-free reflow or conformal coating masking is limited, and each downstream process must verify residue-free removal under the actual cure profile.
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NOVARES PURE 85 AS is a hydrogenated hydrocarbon resin produced by catalytic hydrogenation of a polymerized aromatic petroleum fraction. The resin is supplied as a water-white, low-odor solid in pastille form and is positioned as a tackifying resin for high-performance pressure-sensitive adhesive (PSA) systems. In hot-melt formulations based on styrene-isoprene-styrene (SIS), styrene-butadiene-styrene (SBS), and metallocene polyolefin elastomers, the product functions as a midblock-compatible tackifier that modifies the viscoelastic plateau of the formulated adhesive. Typical addition levels are 40–60 phr of elastomer, depending on the required loop tack, peel adhesion, and shear adhesion failure temperature (SAFT). The designation “PURE 85 AS” encodes a nominal ring-and-ball softening point of 85 °C, an aromatic/alicyclic structure after hydrogen saturation, and a low-chroma profile intended for clear films and low-odor label constructions. The product’s specification envelope covers softening point, Gardner colour, acid number, ash content, melt viscosity, and volatile loss; the certificate of analysis for the specific lot governs acceptance. The resin can be used in transparent tape, label stock, graphic film, and hygiene nonwoven constructions where non-yellowing and low bleed-through are required.
Hot-melt compounding with this grade requires a temperature profile that balances melt viscosity against thermal colour evolution. Melt viscosity at 180 °C is typically 100–250 mPa·s when measured by ASTM D3236 with a Brookfield Thermosel system; this viscosity window permits gear-pump transfer and slot-die coating without excessive shear heating. In twin-screw extruders with L/D ≥ 40, the feed zone is set at 150–170 °C, the mixing zone at 165–180 °C, and the die at 160–170 °C. Processing below 150 °C produces high torque and incomplete resin wet-out, while sustained barrel temperatures above 200 °C increase volatile loss and shift Gardner colour. A nitrogen blanket of 0.2–0.5 bar or vacuum venting at −0.6 to −0.85 bar is recommended for residence times exceeding 30 min. Since the resin is substantially saturated, it does not develop the dark oxidation products typical of non-hydrogenated C9 resins, but residual aliphatic unsaturation still undergoes slow radical oxidation. For extended holding at 190 °C beyond 4 h under atmospheric conditions, published data for this specific configuration is limited; bulk melt stability should be validated by in-line Gardner colour measurement.
Moisture uptake of the pastillated resin is below 0.05 wt% at 25 °C and 50 % relative humidity. At ambient relative humidity above 60 %, the product should be conditioned in sealed packaging until thermal equilibrium is reached to prevent microbubble formation in the melt. Single-screw extruders without melt filtration are generally insufficient for high-speed coating lines processing tackified SIS; positive-displacement gear pumps between the melt stage and the die reduce surging. Melt filtration through 200-mesh screen packs is common for label and tape coating heads.
Representative property ranges are summarised below; they are not batch release limits. The current certificate of analysis governs lot acceptance.
| Parameter | Test method | Value |
|---|---|---|
| Softening point, ring and ball | ASTM E28 | 83–87 °C |
| Gardner colour, 50 % toluene | ASTM D6166 | ≤1 |
| Acid number | ASTM D974 | ≤0.1 mg KOH/g |
| Ash content | ASTM D5630 | ≤0.02 wt% |
| Volatile loss, 3 h at 180 °C | ASTM D5661 | ≤0.5 wt% |
| Melt viscosity at 180 °C | ASTM D3236 | 100–250 mPa·s |
| Glass transition temperature, DSC midpoint | ISO 11357-2 | 40–55 °C |
| Number-average molecular weight, GPC | ASTM D6474 | 600–900 g/mol |
| Density at 25 °C | ASTM D71 | 1.04–1.08 g/cm³ |
Softening point measured by ASTM E28 reflects the resin’s transition from glassy to viscous behaviour. The midpoint glass transition temperature measured by differential scanning calorimetry according to ISO 11357-2 is 40–55 °C. The difference between ring-and-ball softening point and DSC midpoint arises from the broad molecular weight distribution and the presence of oligomeric species. Number-average molecular weight by gel permeation chromatography is typically 600–900 g/mol. Melt viscosity under ASTM D3236 at 180 °C is 100–250 mPa·s. These values differentiate the product from lower-molecular-weight liquid tackifiers and from high-molecular-weight solid resins that require higher processing temperatures.
Hydrogenation changes the failure hierarchy. Conventional unhydrogenated C9 aromatic resins have Gardner colour values of 4–7 in 50 % toluene and contribute ultraviolet absorbance between 300–400 nm. NOVARES PURE 85 AS is specified at ≤1 Gardner and has a substantially lower aromatic chromophore density. Against rosin esters, the acid number of NOVARES PURE 85 AS is ≤0.1 mg KOH/g compared with 5–12 mg KOH/g for typical pentaerythritol esters of disproportionated rosin. The low acid number reduces interaction with epoxy or isocyanate curatives and lowers moisture sensitivity. Against hydrogenated C5 aliphatic resins of similar softening point, the aromatic/alicyclic structure of NOVARES PURE 85 AS provides higher mid-block solubility and higher polarity, which improves specific adhesion to polyester and aluminium but may raise melt viscosity at equivalent loading. Direct peel adhesion comparisons across all film types are formulation-dependent; published data for this exact configuration is limited, and selection should be confirmed by internal design-of-experiment using ASTM D3330 and ASTM D6195.
Thermal stability testing by accelerated aging at 180 °C for 24 h according to ASTM D6111 or by Gardner colour tracking per ASTM D6166 is the standard industrial method. The resin’s low unsaturation reduces carbonyl index development, but the upper bound is set by volatile loss. Volatile loss for the product is specified at ≤0.5 wt% after 3 h at 180 °C by ASTM D5661. In hot-melt holding tanks, nitrogen blanketing, recirculation loops that avoid dead zones, and temperature control within ±5 °C are required. Uncontrolled tank zones above 200 °C lead to measurable colour drift and an increase in low-molecular-weight volatile components. Processing at temperatures above 220 °C can cause thermal scission of the resin backbone and must be avoided. These boundaries define the practical processing window for sustained adhesive production.
Formulation studies typically combine 100 phr SIS copolymer, 40–60 phr NOVARES PURE 85 AS, 10–20 phr naphthenic oil, and 1 phr hindered phenolic antioxidant. Coating is performed at 25–50 g/m² onto 36 µm polyester film, followed by conditioning for 24 h at 23 °C and 50 % relative humidity. Peel adhesion is measured at 180 ° on stainless steel according to ASTM D3330, loop tack according to ASTM D6195, and static shear according to ASTM D3654 with a 1 kg load. Increasing tackifier loading from 40 to 60 phr conventionally raises loop tack and peel adhesion while lowering shear resistance; the optimum is lot-specific because midblock compatibility and diblock content vary. Dynamic mechanical analysis at 1 Hz can locate the glass transition of the midblock phase and is used to ensure that the adhesive loss tangent maximum lies near −10 to +10 °C for room-temperature performance. Published data for this exact formulation with NOVARES PURE 85 AS is limited; internal design-of-experiment is required to establish lot-to-lot performance bands.
Compatibility with polar polymers is composition-dependent. The resin is soluble in aliphatic and aromatic hydrocarbon solvents, toluene, cyclohexane, and mineral oil at typical adhesive mixing temperatures. It is not compatible with highly polar polymers such as plasticized polyvinyl chloride or low-molecular-weight polyglycols; phase separation can occur in formulations containing more than 20 wt% polyvinyl acetate homopolymer. Mixing with amine-functional silanes or amine-based epoxy curatives should be evaluated because residual trace acidity, although low, can accelerate silane condensation in solventborne systems. The product is generally supplied with certificates supporting REACH registration and may be evaluated for indirect food contact under 21 CFR 175.105; grade-specific regulatory status must be confirmed with the manufacturer. Storage stability in sealed packaging is typically 24 months from production when stored below 35 °C away from direct sunlight; agglomeration can occur above 40 °C in pastille form.
