Extraction of polyisoprene with high molar mass
AssigneesAssociation pour les Transferts de Technologies du Mans, Centre de cooperation internationale en recherche afronomique pour le developpement (CIRAD)
InventorsAli Amor, Serge Palu, Daniel Auguste Marie Paul Pioch, Michel Dorget
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Abstract
The invention relates to a method for extracting high-quality polyisoprene by grinding plants via rotary shearing using a device comprising at least one rotor and at least one stator, into particles of size smaller than 1 mm, or grinding at a pH higher than 3 and lower than 8. This method is implemented in aqueous phase and allows the preparation of a dispersion of polyisoprene in water having a weight average molecular weight (MW) higher than 800 000 g/mol. The polyisoprene is extracted from plants and in particular from guayule (Parthenium argentatum). It is a method that is particularly heedful of the environment.
Claims20
A method for extracting polyisoprene having a weight-average molecular weight (MW) higher than 800 000 g/mol, in the form of a dispersion in water, comprising:
- grinding, via rotary shearing using a device comprising at least one rotor and at least one stator or grinding at a pH higher than 3 and lower than 8, at least one plant, plant part or plant derivative selected from the group consisting of guayule (Parthenium argentatum), spurge (Euphorbia lathyris), argan (Argania spinose), mariola (Parthenium incanum), rubber rabbitbrush (Chrysothamnus pinifolius), showy milkweed (Asclepias speciose), pale Indian plantain (Cacalia atripikifolia), rubber vine (Cryptostegia grandiflora), Russian dandelion (Taraxacum koksaghyz), scorzonera (Scorzonera sp.), hoary mountain mint (Pycnanthemum incanum), Canada germander (Teucrieum canadense) and Tall Bellflower Campanula americana in a volume of water or in an aqueous solution ranging from 1 to 15 L/kg of plant, into particles of size less than 1 mm;
- and
- separating solid residues from the dispersion.
Dependencies are inferred from the claim text.