Alkenyl succinic anhydride size emulsification with a...

D - Textiles – Paper – 21 – H

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D21H 21/16 (2006.01) D21H 17/16 (2006.01) D21H 17/31 (2006.01) D21H 17/32 (2006.01) D21H 23/02 (2006.01)

Patent

CA 2327293

A natural gum is used to provide improved emulsification of alkenyl succinic anhydride (ASA) sizing agents for paper products. The natural gum can be nonionic, cationic, anionic, amphoteric, oxidized, derivatized, or modified. The preferred natural gum is from the family of galactomannan gums in which guar gum is a primary example. The alkenyl succinic anhydride (ASA) size emulsion formed with the natural gum improves stability and the film formed is evenly distributed, thereby promoting more uniform sizing of the paper product. The ratio of the ASA to natural gum in the emulsion ranges from 0.01:1 to 100:1, and preferably 0.1:1 to 20:1. The amount of ASA size is 1 lb./ton to 10 lbs./ton of finished paper product and preferably 2 lbs./ton to 8 lbs./ton. A surfactant may be used to further improve the stability of the emulsion.

On utilise une gomme naturelle pour améliorer l'émulsification d'agents de collage à base d'anhydride succinique alcényle (ASA) destinés à des produits de papier. Cette gomme naturelle peut être non ionique, cationique, anionique, amphotère, oxydée, dérivatisée ou modifiée. La gomme naturelle préférée fait partie de la famille des galactomannanes qui comprend notamment la gomme de guar. L'émulsion de colle à base d'anhydride succinique alcényle (ASA) préparée avec la gomme naturelle améliore la stabilité de cette émulsion. Le film ainsi formé est distribué de manière égale, ce qui favorise un collage du produit de papier plus uniforme. Le rapport entre l'ASA et la gomme naturelle dans l'émulsion se situe entre 0,01:1 et 100:1, et de préférence entre 0,1:1 et 20:1. La proportion de colle à base d'ASA varie entre environ 0,5 kg/tonne et environ 4,5 kg/tonne de produit de papier fini et de préférence entre environ 1 kg/tonne et environ 3,6 kg/tonne. On peut utiliser un tensioactif pour renforcer la stabilité de l'émulsion.

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