High-Purity Solvents, Polyurethane (PU) and Resin

Petroleum Resin

Petroleum resin, often referred to as hydrocarbon resin, is a low-molecular-weight thermoplastic polymer produced through the polymerization of unsaturated hydrocarbons derived from petroleum cracking fractions. Depending on the feedstock, these are categorized primarily into C5 (aliphatic) and C9 (aromatic) resins. CAS 64742-16-1 typically identifies the aromatic C9 varieties, while CAS 68131-77-1 represents a more general classification of hydrocarbon resins. These resins serve as essential tackifiers and modifiers in various industrial formulations.

Characterized by their relatively low molecular weight (usually less than 2,000 Daltons) and high solubility in organic solvents, petroleum resins offer an economical alternative to natural resins like rosin or terpene. They are prized for their ability to improve wetting, increase adhesion, and enhance the water resistance of the final product. While inherently chemically stable, their specific performance characteristics—such as softening point, color, and compatibility—are finely tuned during the thermal or catalytic polymerization process to meet the stringent requirements of the adhesives, coatings, and rubber industries.

Attributes

Key Features and Benefits

Superior Tackification: Acts as a highly effective tackifier, significantly enhancing the initial “grab” and peel strength in adhesive formulations.
Chemical Stability: Exhibits excellent resistance to acids, alkalis, and moisture, ensuring longevity and durability in harsh environments.
Solubility and Compatibility: Demonstrates broad compatibility with various elastomers (EVA, SIS, SBS) and excellent solubility in industrial solvents like toluene, xylene, and naphtha.
Thermoplastic Nature: Allows for easy processing in hot-melt applications due to its reversible softening and hardening cycles.
Cost-Efficiency: Provides a stable, high-performance alternative to more price-volatile natural resins.
Low Volatility: High thermal stability ensures minimal outgassing and weight loss during high-temperature processing.

Specifications

Technical Highlights

Softening Point: Ranges typically from 80°C to 150°C (Ring and Ball method), dictating the heat resistance and application temperature of the end product.
Color Grade: Measured on the Gardner scale; ranges from water-white (hydrogenated versions) to dark brown (standard C9), impacting the aesthetics of coatings and adhesives.
Bromine Value: Indicates the degree of unsaturation; lower values signify better oxidative stability and UV resistance.
Molecular Weight Distribution: Narrow polydispersity ensures consistent viscosity and predictable performance in polymer blending.
Acid Value: Characteristically low (usually <0.1 mg KOH/g), preventing unwanted chemical reactions with pigments or other additives.
Glass Transition Temperature ($T_g$): High $T_g$ contributes to the cohesive strength of the final compound.

Download Technical Data Sheet (TDS)

Practical industry uses

Applications

Adhesives and Sealants: Used extensively in Hot-Melt Adhesives (HMA) and Pressure-Sensitive Adhesives (PSA) for packaging, woodworking, and hygiene products.
Rubber Compounding: Functions as a processing aid and reinforcing agent in tire manufacturing, improving filler dispersion and reducing Mooney viscosity.
Road Marking Paint: Enhances the adhesion, durability, and drying speed of thermoplastic road markings, providing resistance to abrasion and weathering.
Printing Inks: Improves gloss, drying time, and pigment wetting in offset and gravure inks.
Coatings and Varnishes: Utilized in marine and industrial coatings to increase water resistance and improve the hardness and gloss of the film.
Paper Chemicals: Applied as a sizing agent to improve water repellency and ink receptivity.