Beyond Oil: The Diverse World of Petroleum Resins

Petroleum resins are the by-product of polymerization of petroleum distillates. They are hydrocarbon resins which are obtained by polymerizing C5 or C9 petroleum fractions. These fractions are derived from the catalytic cracking of petroleum. Petroleum resins are amorphous, solid or semi-solid thermoplastics that are obtained through polymerization at high temperature and pressure. Let's take a deeper look into these versatile resins.

Types of Petroleum Resins
There are mainly three types of Petroleum Resins which are categorized on the basis of feedstock monomers used for polymerization:

Petroleum Resins 
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C5 Resins
C5 resins are obtained from the polymerization of mixtures containing predominantly C5 aromatic and aliphatic hydrocarbons. They have softening point between 90-130°C and find use in applications requiring flexibility like rubber compounding, hot melt adhesives, road marking inks etc. C5 resins provide good adhesion and flexibility.

C9 Resins
C9 resins use C9 aromatic feedstock primarily. They have higher molecular weight and softening point between 100-150°C. C9 resins offer better temperature and chemical resistance compared to C5 resins. They find use in applications like latex compounding, construction sealing.

Turbostratic Resins
These resins use C5 feedstock along with dicyclopentadiene which results in more ordered molecular structure. They have higher softening point of 140-170°C. Turbostratic resins exhibit good UV resistance and low volatility making them suitable for road markings, coatings etc.

Manufacturing Process
The manufacturing process of petroleum resins majorly involves three steps:

1. Pre-treatment of Feedstock
The C5 or C5 aromatic feedstock obtained from petroleum refining process undergoes pre-treatment steps like fractionation, hydrogenation etc. to obtain desired properties in final resin.

2. Polymerization Reaction
The pre-treated feed is then subjected to polymerization reaction at temperature ranging from 120-230°C and pressure of 10-30 bars in presence of Friedel-Crafts catalysts like aluminum chloride. This results in linking of petroleum molecules to form resin polymers.

3. Post-polymerization Treatment
The polymerized resin then undergoes processes like hydrogenation, distillation to remove unreacted feedstock and improve color & stability. The final product is obtained as brown or yellow translucent, thermoplastic solid.

Properties and Applications
Petroleum resins are known for their balanced properties making them suitable for wide range of applications:

- Good adhesion to substrates like rubber, thermoplastics, paper etc.

- Flexibility and impact resistance

- Resistance to chemicals, moisture and weathering

- Thermal stability (softening point 100-150°C)

- Solvency in aromatic and aliphatic hydrocarbon solvents

Owing to above properties, petroleum resins find major uses as:

- Hot melt adhesives

- Pressure sensitive adhesives

- Coatings and inks

- Road marking

- Rubber compounding

- Construction sealants

- Printing inks

- Asphalt modification

Global petroleum resins market size was valued over USD 1.3 billion in 2019 and is expected to grow at 4-5% annually up to 2025 driven by:

- Increasing road construction and infrastructure development leading to higher demand from road marking and construction sealants applications.

- Growing paper, packaging and labeling industry boosting demand from pressure sensitive adhesives.

- Rapid growth of asphalt industry worldwide with emphasis on modifiers for better performance of roads.

- Replacement of solvent-based systems with environmental friendly water-based technologies will open new areas for petroleum resins.

- Development of new grades with properties like lower odor, higher flexibility will support market growth.

Thus, petroleum resins are projected to witness steady growth in coming years owing to their versatile properties and growing end-use industries globally.

 

 

 

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