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Information @ a Glance

  • Alkyd coatings are a class of polyester coatings derived from the reaction of an alcohol (alkohol) and an acid or acid anhydride. Alkyd coatings today are typically manufactured from acid anhydrides such as phthalic anhydride or maleic anhydride and polyols such as glycerine or pentaerythritol and are modified with unsaturated fatty acids to give them air drying properties.
  • The first alkyd resins were obtained by W. J.Smith in 1901, but as a moulding material were only developed from 1948 onwards. Apart from being used in the paint industry; alkyds are used to make car parts, electric switches, engine insulators, electronic components and television parts.

Production Methods

  • Synthetic resins are widely used in the manufacture of a variety of products including paints, inks, adhesives, plastics and many coatings. During the production of synthetic resins such as alkyds and polyesters, the product viscosity and acid number are the primary characteristics used to monitor the overall reaction progress.
  • PET is used as raw materials in the production of secondary, specialized products, such as alkyd resins used
    as enamel paints or coatings is investigated. Given the scale of production of alkyd resins this new use of the recycled PET in alkyd resin syntheses provides a beneficial means for mass consumption of recycled PET.

Application & Technology

  • Alkyd resin dyes modified by very long, long and middle oils make it possible to take advantage of pentaerythritol's properties. If pentaerythritol is mixed with dihydric alcohol, it may be used with short oils. The properties of alkyd resin dyes change greatly when they are compressed together with other resins.
  • Within the framework of a research project together with a paint producer, the development of alkyd resins with low intrinsic viscosity was aimed for. In order to achieve this, we explored the potential of two types of renewable, carbohydrate derived resources as the polyhydric alcohol part of alkyd resins, i.e. sucrose and inulin.
  • In technical terms a true alkyd is also a polyester but in trade terms “alkyd” is mostly used to describe the oil modified material and “polyester” is generally used to describe what are in technical terms, unsaturated polyesters in styrene or similar reactive solvents, or saturated polyesters either as solutions in organic solvents or in solid form.


  •  The annual global growth rate of Phthalic Anhydride is about 2 to 2.5%, though in the traditional industrialized regions like the US, Western Europe and Japan only a moderate increase in demand is to be expected. The highest growth rates are anticipated in emerging markets like China, India and South East Asia where demand is surging by more than 5%, partly even up to 10% annually.
  • Present global demand of Phthalic Anhydride is in the order of 4 million tons per year. Today, a wide variety of chemical companies produce the polymer emulsions and resins that form the backbone (binders) of the coating industries. Unsaturated polyester resins are profitable due to their high(er) selling price. Currently, ERG Pustków has a relatively low market share in this growing market.

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