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Coatings Ingredients
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Coatings Ingredients

Polyester Polyols for Water-Resistant Polyurethane Coatings

SpecialChem / Dec 3, 2003

Polyurethanes provide an obvious route to very high performing coatings, and have long been used in solventborne systems. Polyurethanes can be made waterborne, and have been used successfully as such or in acrylic-urethane hybrids. However, the hydrolytic sensitivity of the commonly used adipate polyester backbones has often resulted in poor storage stability and film durability. This problem can be countered through a range of hydrolytically stable polyester polyols developed by Uniqema, based on dimerized fatty acids. Natural oils and fats have for years provided polyurethane chemists with a variety of building blocks, such as glycerin and castor oil. Less known is the use of a fatty acid derivative, the so-called dimerized fatty acids, for polyurethane chemistry. These dimerized acids are obtained by the conversion of unsaturated fatty acids (from sources like soybean oil or tall oil) by a combination of pressure, temperature and catalysis. This process generates a mixture of products, the most important being dimerized fatty acid. Others are trimerized fatty acid and isostearic acid. Figure 1 gives an overview of the dimerization process

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