Process for preparing low viscosity fatty acid-modified polyesters
AssigneeDeutsche Texaco Aktiengesellschaft
InventorAdolf Buschfeld
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Abstract
In contrast to the known alkyd resins (fatty acid-modified polyesters) produced by way of esterification reaction, the alkyd resins according to this invention are produced by way of successive addition reactions. As a result, the structure and the chain length of the molecules can be predetermined, and the products obtained consist of uniform polyester molecules. Such products have viscosities lower than that of the known alkyd resins, thereby permitting the production of baking varnish systems comprising a low solvent content.
Claims20
A multi-stage process for preparing low viscosity, fatty acid-modified polyesters for use in varnish systems of low solvent content which comprises the following stages conducted in sequential order at elevated temperatures:
- a. reacting a monocarboxylic acid glycide ester with a compound selected from the group consisting of a polycarboxylic acid and an ester polycarboxylic acid to form a polyhydric ester alcohol,
- b. reacting the said polyhydric ester alcohol with a polycarboxylic acid anhydride to form an ester polycarboxylic acid,
- c. reacting the said ester polycarboxylic acid formed in (b) with a material selected from the group consisting of an alkylene oxide, an epoxyalkanol and a polyhydric alcohol to form the fatty-acid modified polyester product.
Dependencies are inferred from the claim text.