Polythiol compositions and their process of preparation from terpenes or from terpene derivatives
AssigneeArkema France
InventorsPierre-Thomas SKOWRON, Sophie MENDES, Kévin TOURNEUR
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for the preparation of a polythiol from a terpene or from a terpene derivative, and also to polythiol compositions and novel polythiols. The process comprises the following stages: a) a terpene or a terpene derivative is reacted with a thiocarboxylic acid in the presence of oxygen (O2) and of at least one organic solvent, so as to obtain a reaction medium comprising a polythioester and said at least one organic solvent; b) a stage of deprotection of the polythioester obtained in stage a) is carried out, so as to obtain a polythiol; in which stage a) and stage b) are carried out in one-pot synthesis.
Claims12
Process for the preparation of a polythiol comprising the following stages:
- a) a terpene or a terpene derivative is reacted with a thiocarboxylic acid in the presence of oxygen (O2) and of at least one organic solvent, so as to obtain a reaction medium comprising a polythioester and said at least one organic solvent;
- and
- b) a stage of deprotection of the polythioester obtained in stage a) is carried out, so as to obtain a polythiol;
- in which stage a) and stage b) are carried out in one-pot synthesis.
Polythiol composition A obtained from a terpene or from a terpene derivative having x C═C double bonds, said composition comprising:
- the polythiol corresponding to said terpene or to said terpene derivative comprising x —SH functions;
- and
- the thiol(s) corresponding to said terpene or to said terpene derivative comprising (x-1) —SH functions;
- with x being an integer greater than or equal to 3.
Polythiol chosen from the trithiol obtained from dihydrofarnesene, the heptathiol obtained from isosqualene and the tetrathiol obtained from camphorene.
Dependencies are inferred from the claim text.