C9 hydrogenated petroleum resin can be used as a plastic modifier in polyolefin blends, particularly for improving processability, surface properties, and heat resistance [1][2][3]. Typical addition levels range from 2–8% by weight depending on the base polymer and target properties [1][3][4]. It is not a substitute for elastomeric impact modifiers and should not be used in applications requiring extreme flexibility [1].
1. What Is C9 Hydrogenated Petroleum Resin?
C9 hydrogenated petroleum resin is a thermoplastic resin produced by polymerizing C9 aromatic fractions (vinyltoluene, indene, methylstyrene) derived from petroleum cracking, followed by hydrogenation to saturate residual double bonds [1][5]. The hydrogenation process produces a resin that is:
- Pale yellow to water-white in color [2]
- Low odor [2][5]
- Thermally stable [2][5]
- Compatible with a range of polymers including EVA, natural rubber, SBR, SIS, and SEBS [2][3]
C9 hydrogenated resin is distinct from non-hydrogenated C9 resin (darker, stronger odor, less stable) [1][6].
2. Typical Properties of C9 Hydrogenated Petroleum Resin
| Property | Typical Value | Test Method | Reference |
|---|---|---|---|
| Softening point | 90–120 °C | ASTM E28 | [2] |
| Acid value | <1 mg KOH/g | ASTM D974 | [2] |
| Gardner color | <3 | ASTM D1544 | [2] |
| Molecular weight | 300–3,000 g/mol | GPC | [2][6] |
| Glass transition temperature (Tg) | 40–70 °C | DSC | [2] |
| Bromine number | <5 g Br/100g | Titration | [2] |
| Ash content | <0.1% | - | [2] |
Note: These are typical values. Actual values depend on grade and manufacturer. Always confirm with supplier TDS.
3. How C9 Hydrogenated Resin Works as a Plastic Modifier
3.1 Processability Improvement
C9 hydrogenated resin can reduce melt viscosity when added to polyolefin blends, improving extrusion and injection molding efficiency [1][3]. Its aromatic content provides compatibility with styrenic and aromatic-containing polymers, promoting even dispersion [1][5].
3.2 Mechanical Property Modification
Research on PP/PE blends shows that hydrogenated C9 petroleum resin achieves optimal tensile strength (33.0 MPa), bending strength (42.6 MPa), and impact strength (5.33 kJ/m²) at 2 wt.% loading, while maximum bending modulus (1,257 MPa) and fracture elongation (28.5%) are achieved at 4 wt.% loading [4].
3.3 Heat Resistance
C9 hydrogenated resin has a softening point of 90–120 °C, which is higher than many aliphatic C5 grades [2]. This makes it suitable for applications where elevated temperature stability is required [1][5].
3.4 Surface Properties and Adhesion
Hydrogenated C9 resin can improve compatibility with polar substrates and pigments due to its aromatic content [1][5]. Research shows that hydrogenated C9 petroleum resin exhibits better compatibility with chemical fiber materials compared to hydrogenated C5 resin, attributed to its larger molecular polarity [6].
4. Typical Addition Levels
| Application | Typical Loading (wt.%) | Key Effect | Reference |
|---|---|---|---|
| PP/PE blend modification | 2–4% | Optimal tensile, bending, and impact strength | [4] |
| General plastic additive | 3–8% | Processability and surface property improvement | [1][2] |
| Recycled fiber composite | Up to 39.5% | Bonding and dispersion of fiber materials | [6] |
Note: Optimal loading depends on base polymer, grade, and target properties. Always validate with application-specific testing.
5. How C9 Hydrogenated Resin Compares to Other Resins
| Resin Type | Softening Point | Heat Resistance | Compatibility | Typical Cost |
|---|---|---|---|---|
| C9 hydrogenated | 90–120 °C | Good | Broad (EVA, SBR, SIS, PP, PE) | Moderate |
| C9 non-hydrogenated | 100–140 °C | Moderate | Good with aromatic polymers | Lower |
| Aliphatic C5 | 80–120 °C | Lower | Best with non-polar polymers | Lower |
| Hydrogenated DCPD | 90–130 °C | Good | Moderate | Higher |
Key takeaway: C9 hydrogenated resin offers a balance of heat resistance, compatibility, and color stability. It is not always the lowest-cost option, but it can reduce total cost when processing improvements and reduced defect rates are considered [1][2][3].
6. What C9 Hydrogenated Resin Is NOT
- Not an elastomeric impact modifier. For applications requiring extreme flexibility (rubber hoses, stretch films), dedicated elastomer modifiers are more appropriate [1].
- Not a universal replacement for all modifiers. Each base polymer and application requires grade-specific evaluation [1][3].
- Not suitable for all clarity requirements. Non-hydrogenated C9 resin can cause discoloration. Hydrogenated grades with low color are available for clarity-sensitive applications [2][5].
- Not a food-contact material without grade-specific validation. Compliance is grade-specific; request supplier documentation [2].
7. Quality Parameters to Request Before Evaluation
| Parameter | Typical Method | What It Tells You |
|---|---|---|
| Softening point | ASTM E28 | Thermal performance and processing window [2] |
| Gardner color | ASTM D1544 | Color contribution to final product [2] |
| Acid value | ASTM D974 | Residual acidity; compatibility indicator [2] |
| Molecular weight | GPC | Viscosity, compatibility, and thermal behavior [2][6] |
| Tg | DSC | Low-temperature performance [2] |
| Batch-specific COA | Supplier COA | Confirms actual values for delivered batch |
8. Next Step
If you are evaluating C9 Hydrogenated Petroleum Resin as a plastic modifier, send us:
- Base polymer type (PP, PE, PS, EVA, etc.)
- Target property improvement (processability, heat resistance, adhesion, surface finish)
- Processing method (extrusion, injection molding, blow molding)
- Target addition level
- Color and odor requirements
- Required documentation (TDS, COA, regulatory statements)
We will recommend a suitable grade and provide batch-specific data for your evaluation.
Request C9 Hydrogenated Petroleum Resin TDS and Sample →
References
- US Patent US6458902B1. Process for Producing Hydrogenated C9 Petroleum Resin and Hydrogenated C9 Petroleum Resin Obtained by the Process. Assignee: Arakawa Chemical Industries. The hydrogenated C9 petroleum resin is useful as an additive for plastics such as polyolefin films or sheets, optical plastics and transparent plastics. [7]
- Anhui Liwei Chemical Co., Ltd. C9 Hydrogenated Petroleum Resin – Product Data Sheet. Softening point: 90–120 °C; acid value <1 mg KOH/g; Gardner color <3; molecular weight 300–3,000 g/mol; Tg 40–70 °C. [6]
- Research on the Optimization of the Blending Modification Process for Polypropylene (PP)/Polyethylene (PE) and Petroleum Resin. DOAJ, 2025. Hydrogenated C9 petroleum resin attained optimal tensile strength (33.0 MPa), bending strength (42.6 MPa), and impact strength (5.33 kJ/m²) at 2 wt.% loading. [8]
- Study on Properties of Recycled Mixed Polyester/Nylon/Spandex Modified by Hydrogenated Petroleum Resin. Science and Engineering of Composite Materials, 2023. Hydrogenated C9 petroleum resin had better compatibility with chemical fiber materials due to its larger molecular polarity. [9]
- Kolon Industries. HIKOREZ® Hydrogenated C9 Resins – Product Data. Excellent thermal stability, light resistance, and low fluorescence.
- Eastman Chemical. Regalite™ Hydrogenated Hydrocarbon Resins – Technical Data. Hydrogenated C9 resins for adhesives, plastics, and rubber modification.
