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Monday, 23 September 2019
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Raw materials & technologies, Technologies, Powder coatings

Producing powder coatings with new coatings binders

Monday, 15 September 2014

A new one-pot method for the melt synthesis of polyarylates based on resorcinol and phthalic acids has been developed.

Oligomers are promising materials for the preparation of powder coatings.

Source: artjazz/Fotolia

Oligomers are promising materials for the preparation of powder coatings.

Source: artjazz/Fotolia

The method consists in the reaction of diphenyl carbonate, phthalic acids and resorcinol using titanium butoxide as catalyst. Model reactions have shown that the diaryl ester is generated in situ by reaction of the aromatic diacid and of the aromatic diol with diphenyl carbonate. It is thus possible to obtain polymers with tailored end-groups and molecular weight, by changing the molar ratio of the monomers and the reaction conditions.

Resorcinol based polyarylates present high UV stability

More specifically, the researchers applied this method to the synthesis of low molecular weight polymers with carboxylic end-groups, suitable for powder coating applications. The literature actually reports that resorcinol based polyarylates present an outstanding long-term UV stability and therefore COOH terminated oligomers are highly promising materials for the preparation of super-durable powder coatings. Such method can also be applied to the preparation of polyarylates with high molecular weight, that are based not only on resorcinol and phthalic acids.

The study is published in: Progress in Organic Coatings, Volume 77, Issue 11, November 2014, Pages 1701-1708.

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