C9 hydrocarbon resin is a low-molecular-weight, thermoplastic aromatic resin produced by catalytic polymerization of the petroleum-derived C9 aromatic fraction. It is available in light yellow to transparent granular form. It is characterized by good solubility and mutual compatibility, water resistance, electrical insulation, chemical stability under acid/alkali conditions, good adhesion, and flow/leveling performance in coatings.
Featured Features
- Thermoplastic structure: Facilitates film formation and re-softening.
- Good solubility: High solubility in aromatic and aliphatic solvents, insoluble in water.
- Chemical resistance: Good stability in acid/alkaline environments, resistance to water.
- Adhesion and wetting: Good adhesion with resinous binders on metal, wood and mineral surfaces.
- Shine and flow: Supports surface smoothness and shine in paints/varnishes.
- Electrical properties: Supports insulation performance in coatings.
Typical Application Areas
- Industrial paints and varnishes (alkyd, epoxy modified, etc.) – balance of flow/leveling, gloss and hardness
- Printing inks – wetting, rheology and drying balance in the recipe
- Adhesives (hot-melt, solvent-based) – viscosity and adhesion modification
- Rubber/rubber blends – processability with fillers/lubricants
- Road marking systems in some places – as an additive resin depending on the formulation
Compatibility & Resolution
- Compatibility (general): Good compatibility with aromatic-based resins, alkyd and some phenolic/epoxy modified systems.
- Solubility: Good in toluene, xylene, high boiling aliphatic solvents, some ketones/esters; insoluble in water.
- Alcohol tolerance: May be limited depending on formulation.
- Typical Technical Values (representative – may vary by grade)
- Softening Point (R&B): ~ 90–140 °C (different grades available)
- Color (Gardner, melt): ~ ≤ 6–9
- Acid Number: ~ ≤ 1.0 mg KOH/g
- Bromine Number: typically 20–60 g Br/100 g
- Volatiles: ~ ≤ 0.5%
- Ash: ~ ≤ 0.1%
- Density (25 °C): ~ 1.05 g/cm³
