Methods of producing cross-linked polysaccharide particles

A - Human Necessities – 61 – K

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A61K 8/73 (2006.01) C08B 37/00 (2006.01) C08J 3/24 (2006.01)

Patent

CA 2732506

A substantially boron-free method for making a cationic guar comprising: reacting particles of polysaccharide with a derivatizing agent to produce derivatized polysaccharide particles, washing the particles, and contacting, prior to or after the step of washing, the particles with a crosslinking agent compound. Also disclosed are methods for making crosslinked derivatized polysaccharides that include contacting particles of a polysaccharide with a first crosslinking agent and/or second cross-linking agent in an aqueous medium under conditions appropriate to intra-particulately crosslink the particles. The first and/or second crosslinking agent can include a copper compound, a magnesium compound, a calcium compound, an aluminum compound, p--benzoquinone, glyoxal, a titanium compound, a dicarboxylic acid, a dicarboxylic acid salt, a phosphite compound or a phosphate compound. The crosslinked polysaccharide of the present invention is especially useful in personal care formulations, especially formulations comprising silicone since it improves silicone deposition.

La présente invention concerne un procédé sensiblement exempt de bore pour la fabrication de gomme de guar cationique comprenant: la réaction de particules de polysaccharides avec un agent de dérivatisation pour produire des particules de polysaccharides dérivatisées, le lavage des particules, et la mise en contact, avant ou après létape de lavage, des particules avec un composé dagent de réticulation. Linvention concerne également des procédés de fabrication de polysaccharides réticulés dérivatisés comprenant la mise en contact des particules dun polysaccharide avec un premier agent de réticulation et/ou un second agent de réticulation dans un milieu aqueux dans des conditions appropriées pour la réticulation intra-particules des particules. Le premier et/ou le second agent de réticulation peut inclure un composé de cuivre, un composé de magnésium, un composé de calcium, un composé daluminium, du p-benzoquinone, du glyoxal, un composé de titane, un acide dicarboxylique, un sel dacide dicarboxylique, un composé de phosphite ou un composé de phosphate. Les particules de polysaccharides réticulées selon la présente invention sont particulièrement utiles dans des formulations de soins personnels, notamment des formulations comportant de la silicone étant donné quelles améliorent le dépôt de silicone.

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