Polyester Resin

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polyester resin

[′päl·ē‚es·tər ′rez·ən]
(organic chemistry)
A thermosetting or thermoplastic synthetic resin made by esterification of polybasic organic acids with polyhydric acids; examples are Dacron and Mylar; the resin has high strength and excellent resistance to moisture and chemicals when cured.

Polyester Resin


an unsaturated oligomer (oligoesters)— for example, polymaleinates and oligoester acrylates. Mixtures of these oligoesters and their solutions in monomers that are capable of copolymerization (styrene, methyl methacrylate, dial-lylphthalate, and so on) are also called polyester resins.

Oligoesters are produced by polycondensation in a melt or inert solvent. Polymaleinates,

are produced from maleic acid, HOOCCH =CHCOOH, or its anhydride (sometimes mixed with another dicarboxylic acid or anhydride) and glycol. Oligoester acrylates,

are produced from an unsaturated monocarboxylic acid, usually acrylic acid, CH2=CHCOOH, or methacrylic acid, CH2 = C(CH3)COOH; glycol; and a dicarboxylic acid. In the above formulas A and A′ are divalent radicals forming parts of the glycol and dicarboxylic acid molecules, respectively; X = — H, — CH3, or — Cl; x = 1–5, y = 0–5, and n = 1–20. The most commonly used glycols are ethylene, diethylene, triethy-lene, and 1,2—propylene; sometimes, mainly during the preparation of oligoester acrylates, the glycols are partially or completely replaced by glycerol, pentaerythritol, or xylitol. The dicarboxylic acids used in this process include adipic, sebacic, phthalic, isophthalic, terephthalic, and tetrachlorophthalic acids.

Unsaturated oligoesters are viscous liquids or solid substances with softening point 30°–150°C, molecular weight 300–3,000, and density 1.1–1.5 g/cm3(20°C).

Oligoester solutions are usually liquids with viscosity 75–7,000 millinewton - sec per sq m, or centipoise, which can convert to cross-linked solid polymers upon curing. Cured polyester resins have high strength; good adhesion to glass fiber, paper, and metals; resistance to water, mineral and organic acids, gasoline, oils, and oxidizing agents; and good electrical insulating properties.

Most polyester resins are used as binders for fiber glass reinforced plastics. They are also widely used in the preparation of paints and varnishes, as poured insulation for sealing components in radio engineering and electrotechnical equipment, and in the impregnation of porous metal castings for hermetic sealing, as well as in the manufacture of haberdashery. Polyester resins also serve as the basis of compounds for poured flooring and of cements and adhesives for bonding fiber glass reinforced plastics to one another and to asbestos cement, fiberboard, and cellular plastics. Polyester resins are manufactured in the USSR (PN-1, PN-3, PN-8), the USA (Atlac, Selectron, Hetron), Great Britain (Crystic, Cellobond), France (Rhodester, Sterpon), and the Federal Republic of Germany (Leguval, Palatal). World production of polyester resins in 1973 was about 1.3 million tons.


Spravochnik po plasticheskim massam, vol. 2. Edited by M. I. Garbar [et al.]. Moscow, 1969. Page 7.
See also references under .


polyester resin

One of a group of synthetic resins which undergo polymerization during curing; advantageous because high pressure is not required for curing; has excellent adhesive properties, high strength, good chemical resistance; esp. used in laminating and impregnating materials.
References in periodicals archive ?
These unsaturated polyester resins are expected to grow within the forecast period on account of their increasing usage in applications such as building and construction, marine, transport and artificial stone among others.
Curing agents for polyester resins include several peroxides under the Peroximon brand: MEK peroxide (K1 and K10), methylisobutyl ketone peroxide (K2), acetylacetone (K3), and cumene hydroperoxide (CH).
Where one finds fairly high utilization within the North American unsaturated polyester resin (UPR) market (composites), there are more players and more free capacity in the UPR market in Europe.
In tests with several types of polyester resins, replacement of 20-50% of the resin with this additive increased toughness with no loss of dimensional or surface control, Reichhold says.
This increase has been necessitated by escalation of the costs of key raw materials which comprise unsaturated polyester resins due to increased and sustained crude oil prices as well as tightness of supply for ethylene and propylene and their derivatives as a result of a fire in April at the Huntsman Port Arthur, Texas olefins manufacturing plant," said Al Naser, Reichhold Vice President of Sales, Composites North America.
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2 Product range and specification of certain unsaturated polyester resins
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Lower prices may be in store for unsaturated polyester resins sometime this quarter if styrene monomer prices start to decline as expected and slumps in the resins' key markets continue.