What exactly do carbon 5 and carbon 9 refer to? ?

C5-C9 copolymerized petroleum resin is a thermoplastic resin produced from the C5 and C9 fractions obtained as by-products of petroleum cracking, through processes such as pretreatment, polymerization, and distillation. It is not a polymer, but rather an oligomer with a molecular weight ranging from 300 to 3000. It features a low acid value, good miscibility, resistance to water, ethanol, and chemicals, chemical stability in the presence of acids and bases, as well as excellent properties for regulating viscosity and thermal stability. Petroleum resins are generally not used alone, but rather in combination with accelerators, regulators, modifiers, and other resins. Applications of the product: This product is used as a viscosity-enhancing resin in hot melt adhesives, hot melt pressure-sensitive adhesives, solvent-based pressure-sensitive adhesives, and sealants. It can also be employed in various rubbers and adhesives as well as in plastic modification purposes, serving as a viscosity enhancer and processing aid. Additionally, it finds use in industries such as ink additives, coatings, paper manufacturing, and road marking paints. 1. Hot melt adhesive: Characteristics of petroleum resin in hot melt adhesives include good fluidity, which enhances the wettability of the base material; good adhesion; and excellent initial sticking properties. It boasts excellent anti-aging properties, a light color, transparency, low odor, and low volatile compounds. It can also be mixed with other tackifying resins to improve certain characteristics of hot melt adhesives. 2. Coatings: The use of this product in coatings can enhance the gloss, adhesion, water resistance, and weather resistance of the paint film; it also improves the dispersion of pigments and the drying speed of the paint film. It is an ideal resin for manufacturing high-quality coatings. Its application in the coating industry holds broad prospects for development. 3. Rubber: Rubber primarily uses petroleum resins with a low softening point; such resins are highly soluble in natural rubber particles and have no significant impact on the vulcanization process of rubber. Adding petroleum resins to rubber helps to increase its viscosity, enhance its strength, and soften it. It not only increases the adhesion between rubber particles but also enhances the adhesion between these particles and cord fibers. 4. Adhesive: It possesses excellent bonding properties; adding petroleum resin to adhesives and pressure-sensitive tapes improves their adhesion, acid resistance, alkali resistance, and water resistance, while also helping to reduce production costs. 5. Hot-melt road marking paint: This product enhances the toughness, hardness, and adhesion of the coating, resulting in a smooth finish. By adding additives, it keeps the resin in a stable state throughout the four seasons, and it mixes well with rosin-based resins. In high-end paint formulations, it enables the paint film to acquire water resistance, UV resistance, and chemical resistance, while also significantly improving its brightness and drying speed. 6. Papermaking: Petroleum resin is modified with maleic anhydride and then alkalized, after which it becomes soluble in water. The papermaking industry used rosin as a sizing agent in the past. Compared to rosin, petroleum resins produce less foaming, result in a smoother paper surface, and are suitable for higher drying temperatures. Gluing paper can reduce its absorption of water, ink, etc., which helps to improve the paper’s smoothness, hydrophobicity, and printability. Packaging and storage: This product is packaged on fumigation-free wooden pallets, with a net weight of 750 kg or 1000 kg per pallet. Each package is wrapped in a triple-layer kraft paper bag, with a net weight of 25 kg per bag. Our company can provide other packaging methods and specifications according to customer requirements. This product can be transported by car, train, ship, etc. During transportation, it must be protected from sunlight, rain, moisture, and hooks. It must not be stored or transported together with alkalis and oxidizing agents. This product is not a **chemical; it should be stored in a well-ventilated, cool, and dry place, with a shelf life of 1 year. Product quality specifications: Q/SQL018-2014, Item G – Series quality indicators. Softening point range, °C ( Global method): G–80 to G–120. Color code (sample: toluene = 1:1): 1#–7#. Acid value (based on potassium hydroxide), (mg/g): ≤ 0.1–0.2. Ash content, %: ≤ 0.03–0.05. Octane capacity at 25°C, (mL/2g): ≥ 15. Bromine value (based on bromine), (g/100g): ≤ 50. Viscosity at 25°C, (mPa·s): ≥ 350–600. Appearance: Milky white, yellow to dark brown flaky or granular solid; transparent and shiny. Note: The octane capacity specification is only applicable when the product is used in inks; it is not a control parameter for other uses.

This is quite unclear, as C5 and C9 themselves have many isomers; without the context of that industry, such a statement is inaccurate. Does the poster mean that industry?

It is a general term for the petrochemical industry; structures containing a certain number of carbon atoms are simply referred to as \"carbon X\", and this notation can be used for communication on a limited scale. For example, c4