Method for manufacturing high-cationic starch solutions

C - Chemistry – Metallurgy – 08 – B

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C08B 31/18 (2006.01) C08B 31/12 (2006.01)

Patent

CA 2333541

The invention relates to a method for producing starch solutions of high cation equivalent value (with a DS of 0.1 - 1.0). The starch to be cationized, advantageously an oxidized starch, is slurried to form a suspension of about 10 - 80 % solids content in an aqueous mixture of a cationizing agent. In the cationization 2,3-epoxypropyltrimethylammonium chloride or an equivalent chlorohydrin-functional cationizing agent is used by about 90 - 1100 g per kg starch solids, and a catalyst is added to the slurry. The reaction is carried out at a high solids content of 40 - 80 %, preferably 50 - 60 %, in at least two successive steps, in the first of which a temperature of about 5 - 40 ~C is maintained, and in the second step a temperature of about 70 - 180 ~C.

L'invention concerne un procédé de production de solutions d'amidon à haute valeur équivalent cations (avec un degré de substitution de 0,1 à 1,0). L'amidon à cationiser, de préférence un amidon oxydé, est transformé en une suspension épaisse, d'une teneur en solides d'environ 10 à 80 %, dans un mélange aqueux d'un agent cationisant. Dans la cationisation, du chlorure de 2,3-époxypropyltriméthylammonium ou un agent cationisant à fonctionnalité chlorhydrine équivalent est utilisé à raison d'environ 90 à 1100 g par kg de solides d'amidon, et un catalyseur est ajouté à la suspension. La réaction a lieu à une teneur en solides élevée de 40 à 80 %, de préférence de 50 à 60 %, en au moins deux étapes successives, dans la première desquelles une température d'environ 5 à 40 ·C est maintenue, et dans la seconde étape une température d'environ 70 à 180 ·C.

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