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Polyester resins are synthetic resins formed by the reaction of dibasic organic acids and polyhydric alcohols. Maleic anhydride is a commonly used raw material with diacid functionality in unsaturated polyester resins. [1] Unsaturated polyester resins are used in sheet moulding compound, bulk moulding compound and the toner of laser printers.
In the natural stone sector the most frequently implemented adhesive systems are based on epoxy resins (EP resins) and unsaturated polyester resins (UP resins) as well as acrylic resins, methacrylate resins and polyurethane systems (PUR resins). However, there are also products which are a combination of two types of resin, e.g. epoxy acrylate.
Jotun manufactures paints and varnishes for marine and industrial purposes, synthetic resins, floor coverings, polyurethane foam, heavy-duty coatings, binders, unsaturated polyesters, glass-fiber reinforced polyester pipes, tanks, and more. [3]
Around 50% of world maleic anhydride output is used in the manufacture of unsaturated polyester resins (UPR). Chopped glass fibers are added to UPR to produce fiberglass reinforced plastics that are used in a wide range of applications such as pleasure boats , bathroom fixtures, automobiles, tanks and pipes.
Unsaturated polyester resins are an extremely versatile, [12] [13] and fairly inexpensive class of thermosetting polymer formed by the polycondensation of glycol mixtures often containing propylene glycol, with a dibasic acid and anhydrides usually maleic anhydride to provide backbone unsaturation needed for crosslinking, and phthalic anhydride ...
Performance Material Products Division: general polymers (alkyd resins, unsaturated polyester resins, plasticizers, waterborne resins, acrylic resins, phenolic resins) specialty polymers (epoxy resins, ultraviolet (UV)-curable resins, polyurethane resins, fluorochemicals), metal carboxylates, sulphur chemicals, fiber and textile colorants
Solutions of 30 to 40% MEKP are used in industry and by hobbyists as catalyst to initiate the crosslinking of unsaturated polyester resins used in fiberglass, and casting. For this application, MEKP often is dissolved in a phlegmatizer such as dimethyl phthalate , cyclohexane peroxide , [ clarification needed ] or diallyl phthalate [ de ] to ...
More economical alkyd resins are produced from the alcoholysis or glyceride process, in which end-product quality control is not as paramount. In this process, raw vegetable oil, high in unsaturated component, is combined with additional polyol and heated to cause transesterification of the triglycerides into a mixture of mono- and diglyceride ...