Petroleum Resin for Rubber CAS NO.64742-16-1

It’s obvious that petroleum resin has become a necessary part in all fields, and at the same time it has been used widely, for example in the oil industry. But we have less knowledge and knowing about what’s the petroleum resin, what’s made of, where is used and so on. So we figure it’s necessary to give you a professional introduction of petroleum resin, hope you can get what you hope to know.

First of all, we would like to tell you what’s the petroleum resin. To be specific, it is a kind of thermal plasticizing hydrocarbon resinproduced by C5, C9 fraction, by-products of petroleum cracking, through pretreatment, polymerization and distillation. It isn’t a high polymer but a low polymer with the molecular weight between 300-3000. Featured by acid value, easy mutual solubilities, resistant to water, resistant to ethanol and chemicals. It has the chemical stabilizing property to acid and alkaline, viscosity adjusting and thermal stabilizing.

Generally, the petroleum resins are not used independently, but have to be used together with other kinds of resins as promoters, adjusting agents and modifiers in hot melt adhesive, pressure-sensitive adhesive, hot melt road marking paint, rubber tires and so on. Petroleum resin, also known as petroleum hydrocarbon resin, is a kind of hydrocarbon resins produced by C5 fraction and C9 fraction, by products of petroleum cracking, through pretreatment, polymerization and distillation.

In addition, it isn’t a high polymer but a low polymer with the molecular weight between 300-3000.  It has the chemical stabilizing property to acid and alkaline,viscosity adjusting and thermal stabilizing. Generally, the resins are not used independently,but have to be used together with other kinds of resins as promoters, adjusting agents, and modifiers in paint, ink, coating, adhesive, rubber tire, and asphalt applications. 

Petroleum Resins are made from petroleum based feedstocks either aliphatic (C5), aromatic (C9), DCPD (dicyclopentadiene), or mixtures of these. There are three basic categories of hydrocarbon tackifier resins, some with several sub-categories.

C5 Aliphatic Petroleum Resins are so named because they are generally polymers of monomers with five carbons. Basic C5 aliphatic resins have Gardner colors between 1.5 and 6 (from light yellow to light brown) and are mostly used to tackify aliphatic polymers, especially natural rubber, EVA, SIS and APO.

Hydrogenated C5 Aliphatic Petroleum Resins are basic C5 hydrocarbon tackifers that have been hydrogenated to improve their color and thermal stability.

C9 Aromatic Petroleum Resins are so named because they are generally polymers of nine-carbon aromatic monomers. They are based on aromatic feedstocks that undergo very little refining prior to the polymerization of the resin. They are usually dark in color within typical Gardner color of 6 to 10 (dark yellow to dark brown). They are used mainly in EVA-based adhesives, contact adhesive for footwear, printing inks, sealants, and paints. C9 liquid resins are especially useful in flooring adhesives. As a class, C9 resins have a distinctive aromatic odor. There are two sub-categories of C9 aromatic tackifiers, each with distinctive properties.

Pure Monomer C9 Aromatic Petroleum Resins are based on aromatic feedstocks that have been highly purified prior to polymerization. These are usually water-white with excellent stability. The lower softening point (< 100°C) types are mainly used in EVA for book binding adhesives and to improve creep resistance in HMA for diapers. The higher softening point pure monomer resin types are useful as end-block re-enforcers (enhance cohesive strength) in styrenic block copolymers, SIS, SBS, and SEBS.

Hydrogenated C9 Aromatic Petroleum Resins are produced through the controlled hydrogenation of basic or pure monomer aromatic resins. A hydrogenated hydrocarbon tackifer resin is the best choice when color and stability are overriding concerns. Usually these resins are colorless (water-white) and are very stable to heat, weathering, and oxidation. Most are hypo-allergenic, with no skin-sensitization properties and are ideally suited for adhesives used in the medical industry where these considerations are critical.

C5/C9 Aliphatic/Aromatic Copolymerization Petroleum Resins are C5 tackifiers co-polymerized with aromatic monomers.They are excellent tackifiers for use in EVA, SBS, and natural rubber polymers.They can also be used in SIS-based HMPSA to provide low melt viscosities with an optimum balance between cohesion and adhesion. Sometimes the slightly aromatic modified C5 resins are used in APO to provide limited compatibility resulting in shorter open times. Darker colored, lower cost types are often used in packaging HMA based on EVA.These resins are mostly C9-based co-polymerized with C5 aliphatic monomers.