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Categories

Categories

Category name:
Dimerised fatty acids and its derivatives

Justifications and discussions

Category definition:
The Dimerised Fatty Acids and its Derivatives (DFA) category covers C16-C18 unsaturated fatty acids derived monomers, dimers and trimers, as well as their hydrogenated products in different proportions and in accordance with their corresponding production and purification processes. They are all prepared by the dimerisation or in some cases isomerisation of C16-18 unsaturated fatty acids, or other C18 unsaturated fatty acids. As UVCB substances derived from natural sources, members of this category are chemically similar as they are all essentially a complex mixture of C16 - C18 unsaturated and saturated, branched and linear fatty acids, their monomers, dimers and trimers with varying structural geometric isomers.
Category order description:
See attached report
Category rationale:
The Dimerised Fatty Acids and its Derivatives (DFA) category covers C16-C18 unsaturated fatty acids derived monomers, dimers and trimers, as well as their hydrogenated products in different proportions and in accordance with their corresponding production and purification processes. They are all prepared by the dimerisation or in some cases isomerisation of C16-18 unsaturated fatty acids, or other C18 unsaturated fatty acids. As UVCB substances derived from natural sources, members of this category are chemically similar as they are all essentially a complex mixture of C16 - C18 unsaturated and saturated, branched and linear fatty acids, their monomers, dimers and trimers with varying structural geometric isomers. In the category family, all substances have an overlap in regard to their composition. With reference to information of existing category, the category of Dimerised Fatty Acids and its Derivatives is based on similarities in physicochemical, environmental and toxicological properties, where by 2 sub-categories were further defined on the basis of their environmental fate properties. The first sub-category (1) covers three monomeric (by-) products of the dimerization process (readily biodegradable). The second sub-category (2) covers the dimeric and trimeric products of dimerization (not readily biodegradable).