Polypropylene
The second most commonly used Polypropylene in the world is thermoplastic. Its production requires propylene polymerization.
Polypropylene’s main applications are filaments, moulding, fibres, and films. In our everyday life, we can find it in moulded containers and cars.
Polypropylene resin comes in three main grades with changes in specific properties based on the composition of the polymer chain.
Polymerization of propylene with catalysts results in the production of thermoplastic resins called polypropylene homopolymers. They are used in different processing technologies, such as blow moulding, injection moulding, film, sheet extrusion and thermoforming. Homopolymer features and properties are widely used in healthcare, packaging, and production of household goods, textiles, film, and pipes. They are popular in the automotive and electrical sectors.
Polymerization of propylene, with ethylene or butene bonds introduced in the polymer chain results in the creation of other thermoplastic resins, called polypropylene random copolymers. They are widely used in high-transparency packaging, blow moulding and injection moulding.
Another type of thermoplastic resin is polypropylene impact copolymers. They are the result of copolymerization with ethylene, but in this reaction, the ethylene content is much higher than with random copolymers. This produces a very tough material with excellent impact strength even at low temperatures.
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