| HS Code | 643859 |
| Softening Point Ring And Ball | 110 °C |
| Color Gardner | ≤1 |
| Melt Viscosity At 160 C | 600 mPa·s |
| Density At 20 C | 0.98 g/cm³ |
| Glass Transition Temperature | 60 °C |
| Number Average Molecular Weight | 800 g/mol |
| Weight Average Molecular Weight | 1300 g/mol |
| Polydispersity Index | 1.6 |
| Acid Value | <1 mg KOH/g |
| Flash Point | >250 °C |
| Iodine Value | <10 g I2/100g |
| Volatile Organic Content | <0.5% |
| Solubility In Water | insoluble |
As an accredited NOVARES PURE 2100 Hydrogenated Resin for Hygiene Adhesives factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | NOVARES PURE 2100 hydrogenated resin is supplied as pastilles in 25 kg multiwall paper bags, palletized and shrink-wrapped for safe handling. |
| Container Loading (20′ FCL) | 20′ FCL: palletized bags of NOVARES PURE 2100 loaded securely, protected from moisture/contamination for safe transport. |
| Shipping | NOVARES PURE 2100 is shipped as solid pastilles in moisture-protective bags, palletized and stretch-wrapped. Transport is via standard dry van or container. Store away from heat, ignition sources, and direct sunlight. Handle with care to prevent bag damage. Normal transport conditions pose no special hazard. |
| Storage | Store NOVARES PURE 2100 in its original, tightly sealed container in a cool, dry, well-ventilated area. Protect from direct sunlight, heat sources, and moisture. Keep away from open flames and strong oxidizers. Avoid prolonged storage above 30°C. Use within recommended shelf life to maintain performance in hygiene adhesive applications. |
| Shelf Life | Shelf life is typically 24 months from production date when stored in original sealed packaging below 30°C. |
At a line speed of 300 to 600 m/min, construction adhesive is deposited between a polypropylene spunbond nonwoven and a cast polyethylene backsheet on a continuous diaper converting line. The hot melt is formulated with a styrene-isoprene-styrene (SIS) polymer matrix, a styrene-isoprene diblock compatibilizer fraction of 15 to 25 wt%, and NOVARES PURE 2100 at 25 to 45 wt%. In this chassis lamination zone the resin addition ratio is constrained at the high end by open-time collapse; slot-die trials show that raising the tackifier above 45 wt% shortens the open time below 0.3 s and increases apparent viscosity above 2,000 mPa·s at 150 °C, causing skipped bonds at the compression nip. The melt is prepared in a shallow-pool hot-melt system at 140 to 155 °C, delivered through a gear pump at 25 to 40 bar, and coated through a slot-die applicator with a shim gap of 0.076 to 0.127 mm. Typical coat weight is 1.0 to 3.0 g/m²; the compression nip runs between 10 and 20 °C to remove heat before wind-up. During long runs the main failure mode is thermal degradation in the melter when residence time at 160 °C exceeds 6 h; char accumulates on filter screens and causes pressure fluctuation above 5 bar. Amine-based stabilizers are avoided in this continuous melt loop because primary amine residues can generate color bodies under oxygen exposure at 150 °C. Compliance for this application zone is maintained by screening the adhesive under ISO 10993-5:2009 for cytotoxicity and ISO 10993-10:2010 for skin sensitization and irritation. REACH Regulation (EC) No 1907/2006 Annex XVII and absence from the REACH SVHC candidate list are required for EU-converted articles. For U.S.-imported nonwoven laminates, FDA 21 CFR 175.105 is frequently applied as an indirect food-contact purity benchmark, although it is not a hygiene clearance. Terminal products include disposable infant diapers, training pants, and underpads.
Elastic strand attachment operations in leg cuff and waistband zones impose a narrower thermal operating window than chassis lamination because the adhesive must maintain filament continuity while contacting thermoplastic polyurethane or polyolefin elastic strands under elongation of 200 to 400 %. Resin loading is set between 25 and 40 wt% in an SIS/SI diblock hot-melt; process viscosity at 155 °C is targeted between 500 and 1,200 mPa·s as measured by ASTM D3236-88(2021). The effective processing window is ≤±5 °C around the 155 °C set point. At 150 °C, spiral spray patterns exhibit filament breakup; at 165 °C, 12 to 18 µm polyethylene backsheet film shows local thinning under the adhesive deposition zone. Nozzle-to-substrate distance is maintained at 20 to 40 mm with atomization air pressure of 0.5 to 1.5 bar on Nordson Universal CF or ITW Dynatec Omega applicators. Open time is held between 0.4 and 1.2 s before the stretched strands enter the chill nip. Heat-fail temperature is monitored by ASTM D4498-07(2021); production specifications typically require a shear adhesion failure temperature above 68 to 75 °C to prevent elastic creep failure in tropical warehouse storage. For skin-contact articles, ISO 10993-10:2010 and REACH Regulation (EC) No 1907/2006 Annex XVII govern the toxicological and restricted-substance baseline. Melt residence at 160 °C should not exceed 6 h to avoid char formation in the filter screen; thermal stability screening at 160 °C for 24 h is a standard supplier qualification requirement. Terminal products include infant diaper leg cuffs, waistbands, and adult brief leg gathers.
When a sanitary napkin or pantyliner is converted, the positioning adhesive is applied to the garment-facing side of the backsheet or transfer-coated from a release liner at 8 to 25 g/m². The formulation adopts NOVARES PURE 2100 at 20 to 35 wt% in an SIS or SEBS pressure-sensitive hot melt, with plasticizer oil limited to 15 to 25 wt% to reduce cold flow into the silicone liner. Cytotoxicity and skin sensitization are assessed under ISO 10993-5:2009 and ISO 10993-10:2010; FDA 21 CFR 175.105 is used as a purity benchmark for low-molecular-weight aromatic contaminants in U.S.-imported hygiene articles. The adhesive is processed through slot-die or rotary screen equipment at 130 to 150 °C. Release force after lamination is measured according to ASTM D3330/D3330M-04(2018) or FINAT FTM 3, with production targets below 8 cN/25 mm after 72 h at 40 °C. Hydrogenated resin with low residual unsaturation reduces migration of low-mass fractions into the release coating, which otherwise raises release force above 10 cN/25 mm and causes liner pick or transfer. Published multi-lab data for this exact resin-liner combination is limited; pilot-line release testing at 40 °C and 75 % RH remains the controlling qualification method. Terminal products include ultra-thin sanitary napkins, pantyliners, and light bladder-control pads.
Across adult incontinence converting lines, the core wrap bond must survive superabsorbent polymer swelling at 10 to 15 times dry core thickness and intermittent wet-dry cycling without cohesive failure. For this structural hot melt, NOVARES PURE 2100 is loaded at 35 to 50 wt% in an SIS/SEBS hybrid binder to raise modulus and creep resistance; plasticizer oil is held between 10 and 18 wt%. Air-assisted fiberization nozzles operating at atomization air pressure of 2.0 to 4.0 bar deposit 1.5 to 5.0 g/m² onto the tissue or nonwoven core wrap before compression at 0.5 to 1.0 bar. The melt temperature is held at 135 to 150 °C; above 150 °C the high resin loading increases char risk on the nozzle insert, while below 135 °C fiberization is lost and adhesive coverage becomes discontinuous. For Class I medical device-type incontinence articles, biocompatibility screening under ISO 10993-5:2009 and sensitization under ISO 10993-10:2010 are required; REACH Annex XVII applies to the finished article supply in the EU. Adhesive bond integrity after wetting is evaluated by the converter using an internal wet-core integrity protocol commonly derived from ISO 15621:2017 physical characterization methods. Production-scale failure modes include adhesive squeeze-out into the acquisition distribution layer and bond rupture at the front waist during machine-direction tension. Terminal products include adult diapers, pull-up protective underwear, and shaped bladder-control pads.
Microporous polyethylene backsheet films, typically calcium carbonate-filled and 12 to 25 µm thick, demand adhesive application temperatures below 150 °C to prevent pore collapse and film distortion. In this configuration NOVARES PURE 2100 is added at 20 to 35 wt% to an SIS or SEBS formulation; higher aromatic resin content is avoided because it raises odor and moisture vapor transmission rate loss. Pattern slot-die or spray application at coat weight 1.0 to 2.5 g/m² with open time below 0.8 s and nipping against a chilled steel roll at 10 to 20 °C preserve the breathable pore structure. Water vapor transmission is monitored by ASTM E96/E96M-22, with z-direction MVTR loss kept below 10 % relative to the uncoated film. For EU-converted articles, REACH Regulation (EC) No 1907/2006 Annex XVII and absence from the SVHC candidate list apply; skin-contact testing follows ISO 10993-10:2010. The low odor profile of the hydrogenated resin becomes operationally critical at this stage because the backsheet is near the outer garment layer and residual monomer or unsaturated tackifier odor cannot be masked downstream. Terminal products include breathable backsheets for infant diapers, feminine hygiene pads, and adult incontinence briefs.
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In hygiene adhesive compounding, a tackifier that retains high melt viscosity at coat weights of 1–5 g/m² on nonwoven backsheets directly influences creep resistance and reduces migration into the fluff pulp or superabsorbent core. NOVARES PURE 2100 Hydrogenated Resin for Hygiene Adhesives is a fully hydrogenated aromatic hydrocarbon resin supplied as a pelletized solid. The product is produced from a C9 aromatic feedstock that has been catalytically hydrogenated to remove olefinic unsaturation and unsaturated ring systems, yielding a low-color cycloaliphatic profile. Commercial technical literature identifies the softening point as 100–106 °C by the ring-and-ball method of ASTM D6493-11 and the melt viscosity at 180 °C as 250–400 mPa·s per ISO 3219. The resin differs from partially hydrogenated C9 tackifiers by a Gardner color below 1 when tested to ASTM D6166 and by an acid number below 0.5 mg KOH/g per ASTM D974. Compared with hydrogenated C5 aliphatic resins of similar softening point, the C9-derived backbone increases elastic modulus and cohesive strength at body temperature; compared with rosin esters, the absence of abietane-derived carboxylic acid groups reduces the potential for acid-catalyzed hydrolysis in high-temperature melt systems.
| Parameter | Typical value | Test method | Observed effect in hygiene hot melts |
|---|---|---|---|
| Softening point | 100–106 °C | ASTM D6493-11 | Controls shear adhesion failure temperature and creep resistance |
| Melt viscosity at 180 °C | 250–400 mPa·s | ISO 3219 | Determines pump pressure and spiral-spray pattern stability |
| Acid number | <0.5 mg KOH/g | ASTM D974 | Minimizes carboxyl interaction with polar polyolefin modifiers |
| Gardner color | <1 | ASTM D6166 | Reduces visible yellowing in thin nonwoven laminates |
At 150–170 °C application temperatures in slot-die coating heads, partially hydrogenated C9 resins may undergo autoxidation at residual ethylenic unsaturations, producing low-molecular-weight aldehydes, ketones, and naphthenic fragments that migrate through 10–20 g/m² nonwoven layers. NOVARES PURE 2100 is fully hydrogenated, which removes most of the residual olefinic unsaturation that would otherwise participate in oxidative degradation. The improvement is not linear with hydrogen pressure history; final oxidative stability must be measured on the compounded adhesive by differential scanning calorimetry oxidative onset temperature under ASTM E2009-08 or by oxidative induction time at 180 °C using ISO 11357-6:2023. On diaper chassis lamination lines, edge-stringing and nozzle plugging are the usual production deviations that accompany tackifier degradation and partial gel formation, particularly in slot dies with narrow lip gaps below 0.5 mm. Published data for a direct oxidation-onset comparison between NOVARES PURE 2100 and partially hydrogenated C9 resins under identical aging conditions is limited and should be generated on the final adhesive rather than assumed from resin chemistry alone.
In elastic attachment applications, a high softening point creates a wider temperature band between body-temperature shear and hot-melt pump melt. The ring-and-ball value of 100–106 °C corresponds to a glass transition plateau that helps the adhesive maintain storage modulus at 37 °C. Adhesive based on SIS and hydrocarbon oil systems formulated with 20–35 phr of NOVARES PURE 2100 typically increases peel and reduces creep relative to an all-aliphatic tackifier of equivalent softening point. Above 45 phr, however, the formulation can enter a brittle plateau, and the final window requires peel measurement under ASTM D1876 and shear adhesion failure temperature under ASTM D4498. On hot-melt mixing skids, high screw energy input may occur if pellets are introduced into polymer melt below 140 °C; pellet fragment dispersion improves when the feed zone is maintained between 160–180 °C and the twin-screw extruder has a 40:1 L/D barrel length with distributive mixing elements.
In low-odor hygiene applications, secondary emissions after thermal aging are evaluated by purge-and-trap gas chromatography–mass spectrometry rather than by sensory panel alone. The fully hydrogenated resin profile in NOVARES PURE 2100 lowers the chromatographic signal in the C6–C14 aldehyde region that often originates from residual unsaturated species. The resin is not a zero-volatile material. Surface moisture pickup can occur when pellets are stored in open containers at ambient relative humidity above 60% RH; pre-drying at 70–80 °C for 2–4 h in a desiccant-hopper drying system is recommended before introduction into high-shear mixers. Separation from rosin ester additives is advisable in plant storage because ester cleavage at processing temperatures can generate free abietic acid and shift the overall acid number upward, negating the low-acid advantage of the hydrogenated resin.
When a hygiene converter specifies a total volatile ceiling of 0.05 wt% or less in the finished adhesive, the tackifier contribution must be considered from pellet headspace and from the melt film. Partially hydrogenated C9 resins may still contain residual indene, methylstyrene derivatives, and low-molecular-weight aromatic fractions even when Gardner color is acceptable. NOVARES PURE 2100 is specified for low residual unsaturation, but final compliance must be verified on the compounded adhesive by VDA 278 thermodesorption or ISO 12219-2 chamber sampling. In odor-sensitive feminine care and adult incontinence products, hot-melt odor after aging at 100 °C for 24 h can be evaluated by DIN EN ISO 16000-28 or an equivalent panel method; the resin is not the sole contributor because process oils, antioxidants, waxes, and polyolefin copolymers also generate volatile secondary products.
Replacement trials in SIS-based disposable diaper leg and waistband adhesives show that the immediate change is the melt viscosity curve rather than the ring-and-ball softening point. A hydrogenated C5 resin of similar 100 °C softening point will usually exhibit a lower melt viscosity at 160 °C, while the C9-derived NOVARES PURE 2100 raises viscosity and elastic modulus. Spray pattern measurements on 0.8 mm nozzle dies indicate that the higher tackifier viscosity can reduce spatter and improve pattern stability if pump pressure is increased, but it can also shorten open time and raise adhesive consumption if the transfer gap is unchanged. Formulators typically compensate with 3–6 phr additional process oil or by raising the application temperature by 5–10 °C; changes outside this range should be checked by dynamic mechanical analysis at 1 Hz across 20–80 °C to avoid loss of elastic attachment performance.
In SBC-based construction adhesives, the tackifier phase partitions between the polystyrene endblock and the midblock depending on aromatic content and hydrogenation depth. Because NOVARES PURE 2100 is fully hydrogenated from a C9 aromatic stream, it is not a simple aliphatic diluent. In SIS systems containing 25 wt% diblock, the resin raises the plateau modulus above 104 Pa at 30 °C when formulated at 30 phr, shifting the elastic attachment mode toward higher creep resistance. Small-amplitude oscillatory shear on a 25 mm parallel-plate rheometer using 1% strain and 10 rad/s can detect this transition; phase separation may occur above 50 phr if midblock compatibility is exceeded, particularly in high-diblock SIS grades. A second table summarizes the directional differences commonly encountered in formulation rebalancing, although direct side-by-side data for every tackifier lot is limited.
| Comparative parameter | NOVARES PURE 2100 | Partially hydrogenated C9 resin | Hydrogenated C5 resin |
|---|---|---|---|
| Softening point | 100–106 °C | 95–105 °C | 95–105 °C |
| Melt viscosity at 180 °C | 250–400 mPa·s | 200–350 mPa·s | 100–300 mPa·s |
| Typical acid number | <0.5 mg KOH/g | <1 mg KOH/g | <0.5 mg KOH/g |
| Residual unsaturation | Low | Moderate | Low |
| Odor contribution | Low | Moderate | Low |
| Elastic modulus in SIS at 30 °C | Higher | Intermediate | Lower |
For hygiene adhesives that require skin-sensitive or medical-grade claims, the final laminate must be qualified, not the tackifier alone. Cytotoxicity testing follows ISO 10993-5 and skin irritation follows ISO 10993-10; when an OECD validated alternative is used, OECD 439 reconstructed human epidermis irritation testing may be substituted. NOVARES PURE 2100 is intended for industrial hot-melt formulation under Regulation (EC) No 1907/2006 REACH obligations, but downstream compliance with EU 2017/745 or FDA 21 CFR 175.105 is not automatic and depends on the complete formulation and final laminate construction. Processors should confirm the lot-specific certificate of analysis because the product is produced in campaigns and traceability to the raw material lot is required for hygiene audit protocols.
In continuous hot-melt lines, the transition from nitrogen-purged bulk storage to the melt tank should maintain a headspace oxygen concentration below 5% to avoid long-term color drift at 160 °C. Inline melt filtration through 40 µm mesh before the coating die is recommended to capture pellet fines and incidental crosslinked fragments. When NOVARES PURE 2100 is used in high-speed multiline construction at 600 m/min, the pot life at 165 °C under nitrogen is typically sufficient for an 8 h shift; however, the tank should not be held over weekends without stabilizer verification. These plant-specific controls are not substitutes for final adhesive testing, and compatibility with polyurethane hot-melt systems should be tested separately because the resin is non-polar and may phase-separate at high addition levels.
