The term "Petroleum Resins" is used frequently to refer to thermoplastic hydrocarbon resins with low molecular weights of 500–5,000 that are generated from cracked petroleum fractions. They should be separated from high polymers like polystyrene and polypropylene, which are essentially pure monomer-based resins manufactured from styrene and propylene, respectively, as their starting constituents. The petroleum resin is appropriate for use in literally thousands of applications, including paints and varnishes, coatings, printing ink, lithographic inks, paper, adhesives, rubber, concrete-curing compounds, and other areas where tackiness is required.
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