| HS Code | 940854 |
| Softening Point C | 135-155 |
| Glass Transition Temperature C | 80-110 |
| Melt Viscosity At 200 C Mpa S | 400-800 |
| Molecular Weight Mn | 350-500 |
| Molecular Weight Distribution Mwd | 1.3-1.8 |
| Color Gardner | 1-3 |
| Acid Value Mg Koh G | < 0.5 |
| Density At 25 C G Cm³ | 1.08-1.12 |
| Thermal Decomposition Temperature C | > 300 |
| Tensile Strength Mpa | 20-40 |
| Elongation At Break | 1-3 |
| Water Absorption | < 0.05 |
As an accredited NOVARES DCPD Cycloaliphatic Resin for High-Temp Adhesives factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaging: 200 kg net in lined steel drums, ensuring safe handling and stability for high-temperature adhesive applications. |
| Container Loading (20′ FCL) | 20′ FCL ensures safe, efficient loading of NOVARES DCPD resin, preserving quality for high-temperature adhesive applications. |
| Shipping | NOVARES DCPD resin ships in sealed drums or bulk containers, protected from moisture and contamination. Transport requires standard chemical handling procedures, with ventilation and temperature control to prevent polymerization. Ensure proper labeling, secure loading, and compliance with local regulations for safe delivery. |
| Storage | Store in original, tightly sealed containers in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep away from strong oxidizers and moisture. Maintain temperatures between 10–30°C (50–86°F). Avoid prolonged exposure to air. Use proper PPE when handling. Shelf life is typically 12 months under recommended conditions. |
| Shelf Life | Shelf life is typically 12 months when stored in original sealed containers, away from heat and moisture. |
In heat-cured epoxy structural bonding for electric vehicle battery enclosure sealing and body-in-white assembly, NOVARES DCPD cycloaliphatic hydrocarbon resin is incorporated into the epoxy resin side at 5–15 wt% before dicyandiamide or latent aromatic amine hardeners are added. The resin is non-reactive; therefore, cure development must be confirmed by differential scanning calorimetry according to ISO 11357-3 because excessive addition suppresses onset temperature and lowers crosslink density. On automotive meter-mix dispensing equipment with heated feed plates at 40–60 °C and static mixer dispense pressures below 80 bar, the mixed viscosity target is 20,000–80,000 mPa·s at 25 °C per ISO 3219. Overlap shear specimens prepared from degreased and abrasion-treated 6082-T6 aluminium follow ISO 4587:2003; a control range of 15–25 MPa at 23 °C is applied for bonded enclosure side frames. Thermal shear retention after 500 h at 180 °C is specified as not less than 70% of initial room-temperature shear strength.
| Property | Test standard | Control range |
|---|---|---|
| Mixed viscosity at 25 °C | ISO 3219 | 20,000–80,000 mPa·s |
| Overlap shear, Al 6082-T6 | ISO 4587:2003 | 15–25 MPa |
| Hot shear retention after 500 h/180 °C | ISO 4587:2003 | ≥ 70% |
| Glass transition temperature | ISO 6721-1:2019 | 150–180 °C |
Production experience with 40:1 L/D twin-screw extruders indicates that DCPD resin should be pre-blended with solid epoxy rather than side-fed, because the side feeder generates localized shear exotherm and a melt-temperature overshoot that triggers latent hardener reaction. The addition limit of 15 wt% is also set by phase morphology; above this loading, scanning electron micrographs of fracture surfaces show nodular domains, and room-temperature lap shear can drop by more than 10% without an accompanying improvement in hot adhesion. Pre-drying of the DCPD resin is required at relative humidity above 60%; otherwise occluded moisture is released during cure and produces bonded-joint porosity.
Under-hood wire harness fixation lines dispense polyamide hot-melt adhesives at 190–210 °C from gear-pump equipment onto nylon cable jackets, convoluted tubing, and connectors. NOVARES DCPD cycloaliphatic resin is compounded at 10–20 wt% on a 40:1 L/D twin-screw extruder with predried polyamide pellets; late addition into a side feeder is avoided because localized viscous heating produces melt-temperature overshoot above 220 °C, which accelerates polyamide oxidation and char formation in hot-melt reservoirs. Differential scanning calorimetry per ISO 11357-3 shows a reduction in polyamide crystallization enthalpy of 3–6 J/g when the DCPD loading is raised from 0 wt% to 15 wt%, and this corresponds to an extension of open time on a 60 °C aluminium plate from approximately 40 s to 70 s. Melt flow rate measured at 210 °C under 2.16 kg load according to ISO 1133-1:2022 is typically held between 15 g/10 min and 40 g/10 min. Shear adhesion failure temperature determined by ASTM D4498-07 remains above 150 °C when the DCPD resin has a ring-and-ball softening point above 140 °C per ASTM E28-18. Moisture content in the polyamide must be below 0.1 wt% before compounding because hydrolysis at melt temperature reduces adhesion to nylon jackets and increases viscosity drift. At loadings above 20 wt%, low-temperature flexibility deteriorates; mandrel bend tests at −40 °C show cracking before wire harness bundle flexure limits are met.
Permanent-magnet bonding in electric traction motors uses two-component reactive acrylic adhesives that are dispensed onto NdFeB magnet segments before insertion into laminated rotor stacks. NOVARES DCPD cycloaliphatic resin is dissolved into the methacrylate monomer side at 5–10 wt% to increase uncured viscosity for controlled gap fill to 0.2–0.5 mm while reducing polymerization shrinkage. The peroxide-amine cure is influenced by the unsaturated cycloaliphatic structure; at loadings above 10 wt%, surface cure can remain tacky after 3 min at 23 °C because the DCPD double bond consumes radical flux, so accelerator-to-peroxide ratios must be rebalanced. Fixture time on grit-blasted steel is 3–5 min at 23 °C, and post-cure is 30 min at 80 °C. Overlap shear on steel according to ASTM D1002-10 is controlled within 18–28 MPa after post-cure. Dynamic mechanical analysis per ISO 6721-1:2019 is used to confirm the glass transition temperature remains above 160 °C for rotor service temperatures up to 150 °C. Cured water absorption per ISO 62:2008 after 24 h immersion is held below 2% because moisture ingress at the magnet-adhesive interface promotes corrosion. The monomer-side viscosity must remain below 50,000 mPa·s at 25 °C; above this limit, dual-piston cartridge dispensing at 4–6 bar produces pressure spikes that cause ratio drift. Final adhesives must also comply with REACH SVHC restrictions and the RoHS Directive 2011/65/EU for bonded rotors sold into the EU market.
For powder coating masking tapes, solvent-borne acrylic pressure-sensitive adhesives are crosslinked with aluminum acetylacetonate or melamine-formaldehyde at 0.5–2.0 phr and then compounded with NOVARES DCPD cycloaliphatic hydrocarbon resin at 10–20 phr of polymer solids. The high softening point of the DCPD resin, determined by ASTM E28-18 above 140 °C, is necessary to prevent shear failure when masking tapes are exposed to 200 °C for 30 min in convection ovens. Clean removal after high-temperature exposure is verified by ASTM D3330/D3330M-04(2010) loop tack and ASTM D3654/D3654M-06(2011) static shear; the target shear holding time at 150 °C under a 1 kg load is greater than 24 h. Because low-molecular-weight resin fractions can migrate to the tape backing during aging, gel fraction obtained by 24 h methyl ethyl ketone extraction must exceed 60% before coating. A loading limit of 20 phr is set because loop tack on stainless steel falls below 8 N/25 mm at higher loading, and the dried adhesive film develops visible haze after 7 days at 50 °C. Production coating is conducted on slotted-die solvent coaters at line speeds up to 120 m/min with wet film thickness adjusted to produce dry coat weights of 25–35 g/m². Published data for this specific formulation configuration is limited; therefore, high-temperature residue testing on powder-coated panels is required before production release because crosslinker type and DCPD loading interact strongly.
Automotive interior trim lamination with polyurethane reactive hot-melt runs at 110–130 °C, and NOVARES DCPD cycloaliphatic resin is pre-blended into the polyol side at 5–10 wt% to increase initial green strength and suppress creep at 120 °C. The cycloaliphatic resin must meet purity limits before blending: acid number below 1 mg KOH/g, hydroxyl value below 5 mg KOH/g, and water content below 200 ppm by ISO 15512:2019. Higher acid or hydroxyl levels consume free isocyanate and shift the NCO index, reducing final crosslink density. Creep performance is evaluated under a static load of 1 kPa at 120 °C for 24 h; the deformation limit is 2 mm for textiles bonded to polypropylene substrates. The increase in melt viscosity is measurable by ISO 3219; at 15 wt% loading, viscosity at 130 °C can rise from 8,000 mPa·s to 14,000 mPa·s, which restricts laminated panel throughput. Open time under moisture-cure conditions is therefore limited to 4–6 min at 23 °C and 50% RH. Because the DCPD resin is hydrophobic, cure rate after moisture exposure is not severely inhibited, but the laminating line must maintain substrate moisture content below 0.3 wt% to prevent orange-peel surface defects. Blending temperature must remain below 60 °C during polyol preparation because higher temperatures accelerate moisture uptake and can destabilize the isocyanate component when the two parts are later combined.
Epoxy film adhesive for secondary aerospace composite and honeycomb bonding is compounded with NOVARES DCPD cycloaliphatic resin at 3–8 wt% of the epoxy base to reduce brittle fracture without impairing hot-wet performance. The film is cast at 120–250 g/m² onto release paper and cured at 177 °C for 2 h under 0.7 bar autoclave pressure. Volatile content is screened by thermogravimetric analysis according to ISO 11358-1:2022, with mass loss at 177 °C required to remain below 1% before aging. After 1,000 h at 177 °C, aged panel mass loss is required to be below 2%; specimens that exceed this limit show porosity and reduced interlaminar adhesion. Overlap shear on 2024-T3 aluminium per ISO 4587:2003 is controlled to exceed 20 MPa at 23 °C and 10 MPa at 120 °C. Climbing drum peel on honeycomb core per ASTM D1781-98(2012) is held above 20 N/76 mm; DCPD loading above 8 wt% lowers peel strength below this threshold. Pre-bond humidity is controlled to 45% RH maximum because absorbed moisture causes porosity during autoclave cure. The film adhesive is incompatible with amine-based toughening agents that impart excessive flexibility; such combinations accelerate phase separation during film casting and produce inconsistent bondline thickness.
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NOVARES DCPD Cycloaliphatic Resin for High-Temp Adhesives is a dicyclopentadiene-based low-molecular-weight hydrocarbon oligomer supplied in flake or pastille form. It functions as a high-softening-point tackifier in hot-melt adhesive compounds where upper service temperature and cohesive strength above 120 °C are critical. Commercial grades in the series are commonly designated by a numerical suffix linked to the ring-and-ball softening point measured according to ASTM E28; available data sheets typically cover the range 100 °C to 160 °C. Release properties reported by manufacturers for non-hydrogenated cycloaliphatic DCPD grades include an acid number below 1 mg KOH/g by ASTM D974, a Gardner color of 4 to 7 by ASTM D1544, and a glass transition temperature of 60 °C to 110 °C by ISO 11357-2. Molecular weight by gel-permeation chromatography, DIN 55672-1, is typically reported as number-average molecular weight 400 to 900 g/mol and weight-average molecular weight 800 to 3000 g/mol, giving polydispersity 1.8 to 3.5. Melt viscosity at 200 °C measured by ASTM D3236 is typically 0.3 to 1.0 Pa·s for a nominal 120 °C R&B grade.
The cycloaliphatic backbone is obtained by thermal oligomerization of dicyclopentadiene, producing norbornene-derived cyclic repeat units. Residual unsaturation remains in the non-hydrogenated grade, with iodine number above 100 g I₂/100 g by ASTM D1959. Hydrogenated DCPD grades reduce this value below 5 g I₂/100 g and shift Gardner color below 2, but the non-hydrogenated NOVARES DCPD grade retains a different solubility envelope in ethylene-vinyl acetate and polyolefin systems. Unlike aromatic C9 resins, the DCPD structure contains no aromatic ring; this lowers the UV chromophore density and reduces absorbance in the 250–300 nm region. Unlike rosin esters, the acid number is below 1 mg KOH/g, so the resin does not protonate polyamide chain ends during prolonged hot-melt processing.
The oligomer consists primarily of dimers and trimers of cyclopentadiene with thermally rearranged norbornene and tetrahydroindene structures. Because the repeating structure is cycloaliphatic, the resin contributes a high glass transition temperature without the crystallinity of polyterpene resins. This is reflected in the difference between softening point and Tg: a grade with 120 °C R&B softening point may exhibit a Tg near 70 °C, while a 160 °C grade may approach 110 °C. The molecular weight distribution is broad, which is intentional for hot-melt tackifier function: the low-molecular-weight fraction lowers melt viscosity and improves substrate wetting, while the high-molecular-weight fraction increases elastic recovery and high-temperature cohesion. In gel-permeation chromatography using polystyrene calibration, the high-molecular-weight tail above 5000 g/mol is typically below 5 % of the total area. Thermal polymerization is conducted in a continuous stirred reactor at 250–280 °C under inert gas; the reaction proceeds through Diels-Alder addition and ring rearrangement rather than free-radical chain growth. This gives a non-polar, aliphatic backbone with some residual norbornene double bonds.
On a 25 mm co-rotating twin-screw extruder with L/D 48, NOVARES DCPD is usually metered into polyamide 6/66 hot-melt base resin at 20–35 phr. Barrel set points are commonly 180 °C to 210 °C; melt temperature at the die is held below 220 °C to prevent exothermic color-body formation. The resin is added in the first side-stuffer after the polymer melt seal, rather than at the main feed throat, to reduce screw slippage and melt-temperature spikes. In production runs, feed throat sticking is less frequent than with rosin ester flakes when the resin is supplied as pastilles, because the lump temperature at the feed throat remains below the softening point. If surface moisture is present after storage at relative humidity above 60 %, pre-drying at 60 °C for 4 h in a forced-air tray dryer is recommended before compounding. Failure to dry can cause microvoids in the adhesive film and feed throat bridging. The compounded melt flow rate is measured by ISO 1133-1:2022 at 190 °C with a 2.16 kg load.
High-temperature performance of a hot-melt adhesive is controlled by the plateau modulus above the base polymer melt temperature. Because the NOVARES DCPD resin has a Tg higher than the service temperature, it reduces chain mobility in the amorphous phase and delays cohesive failure. In formulated polyamide and APAO adhesives, lap shear testing by ASTM D1002 on degreased steel coupons after conditioning at 150 °C for 24 h is used to quantify this effect. Published data for a specific grade at a single addition level is limited, but formulators commonly compare the lap shear retention ratio before and after thermal aging. DCPD-containing formulations generally show a higher retention ratio than aromatic C9 formulations with equivalent softening point because the cycloaliphatic resin undergoes less thermo-oxidative chain scission at the adhesive-substrate interface. Dynamic mechanical analysis in shear mode, ISO 6721-1, is used to track the storage modulus plateau. The high-molecular-weight tail of the resin narrows the loss peak and reduces creep at temperatures just below the base polymer melting point.
The substitution is not drop-in because the DCPD resin has a narrower compatibility window with low-polarity polyolefins and a higher melt viscosity at equal ring-and-ball softening point. In APAO-based automotive assembly adhesives, replacing 20 phr of aromatic C9 resin with 20 phr of DCPD typically raises the viscosity at 190 °C and shortens open time, while increasing high-temperature peel resistance. Peel adhesion measured by ASTM D1876 on stainless steel may remain unchanged at 23 °C but improve at 80 °C. The color of the final adhesive remains darker than a hydrogenated DCPD formulation but lighter than an aromatic C9 formulation. The absence of aromatic rings reduces the tendency to form conjugated chromophores during hot-melt processing above 200 °C. However, the non-hydrogenated DCPD grade has residual unsaturation; formulations intended for outdoor UV exposure require a light stabilizer package because the unsaturated cyclic units can undergo photo-oxidative crosslinking. For polyamide systems, the replacement must be validated with melt filtration and hot-melt pot stability because the DCPD resin does not contribute the acid functionality that some rosin esters provide for interfacial adhesion to aluminum.
Table 1 provides the comparative resin property envelope used for substitution decisions. The values are typical commercial ranges, not batch specifications, and should be verified against the supplier certificate of analysis.
| Resin type | R&B softening point ASTM E28 | Acid number ASTM D974 | Gardner color ASTM D1544 | Glass transition ISO 11357-2 | 5% mass loss ISO 11358-1 |
|---|---|---|---|---|---|
| NOVARES DCPD cycloaliphatic | 100–160 °C | <1 mg KOH/g | 4–7 | 60–110 °C | 280–350 °C |
| Aromatic C9 resin | 90–140 °C | <1 mg KOH/g | 8–12 | 40–80 °C | 250–320 °C |
| Rosin ester | 80–120 °C | 5–20 mg KOH/g | 5–9 | 30–70 °C | 220–280 °C |
| Hydrogenated DCPD | 100–160 °C | <1 mg KOH/g | 0.5–2 | 60–110 °C | 320–380 °C |
Table 2 lists a starting-point formulation envelope for a high-temperature polyamide hot-melt adhesive. The compounding parameters refer to a 25 mm co-rotating twin-screw extruder with L/D 48; transfer to larger production lines requires scale-up validation.
| Parameter | Range or condition | Standard or equipment |
|---|---|---|
| Polyamide base resin | 60–75 phr | — |
| NOVARES DCPD resin | 20–35 phr | — |
| Antioxidant | 0.5–1.0 phr | — |
| Processing stabilizer | 0.2–0.5 phr | — |
| Extruder barrel set point | 180–210 °C | 25 mm twin-screw L/D 48 |
| Melt flow rate condition | 190 °C, 2.16 kg | ISO 1133-1:2022 |
| Lap shear specimen | degreased steel, 25.4 mm overlap | ASTM D1002 |
In rosin-ester-tackified systems, ester hydrolysis under hot-melt processing can generate carboxylic acid groups that attack polyamide base polymers and shift the melt flow rate. DCPD cycloaliphatic resin has an acid number below 1 mg KOH/g and no ester linkages, so this hydrolytic mechanism is absent. Its dominant aging mechanism is instead thermo-oxidative radical attack at norbornene double bonds and tertiary cyclic carbons. Thermo-oxidative aging at 150 °C in forced-air ovens produces an increase in resin molecular weight through coupling reactions, followed by eventual embrittlement. Oxidative induction time by ISO 11357-6 is used to compare stabilizer packages. A light-stabilizer package containing a hindered phenolic antioxidant and a phosphite processing stabilizer at 0.2–0.5 phr is normally sufficient to control this during standard high-temperature application. Strong oxidizing agents and peroxide-initiated curing systems should be avoided unless residual unsaturation is explicitly included in the cure kinetics.
Grade selection within the NOVARES DCPD series is driven by the hot-tack temperature required by the application. A resin with nominal R&B softening point of 100–120 °C is used for faster wetting on low-energy substrates and lower pump pressure, while a 140–160 °C grade is specified when the adhesive must retain cohesion above 120 °C. The higher-suffix grade requires a higher application temperature and may reduce open time; therefore, the final formulation must be checked by ASTM D3236 for melt viscosity and by ASTM D1002 for lap shear after thermal aging. Production-scale replacement of aromatic C9 resin with DCPD resin should include a full color, odor, and melt-stability trial in the actual hot-melt delivery unit because laboratory open-time measurements do not capture pump shear history.
