The Petroleum Resins are synthetic hydrocarbon resins created through the polymerization of mixtures of unsaturated monomers (olefins, diolefins, and aromatic vinyl compounds) that are produced as by-products from the cracking of natural gas liquids, gas oil, or petroleum naphthas. The resins range in physical form from liquids to brittle solids and have generally low molecular weights. The majority of widely used plastics and resins, including polyethylene, polypropylene, polystyrene, etc., are also made from petroleum, but they differ from the petroleum resins being considered here in that they are created from pure monomers, have known, precise compositions, and are polymerized to much higher molecular weights.
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