C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
C08B 30/12 (2006.01) C08B 30/00 (2006.01) C08B 31/18 (2006.01) C08B 33/08 (2006.01)
Patent
CA 2486688
A method for the modification of a starch or a starch derivative for decreasing the viscosity of the same in the presence of hydrogen peroxide, a metal catalyst, especially copper sulphate and optionally an agent for increasing the pH so that the dry matter content at the beginning of the modification is at least 60 %. The invention also involves use of the modified starch in i.a. surface sizing of paper.
L'invention concerne un procédé pour modifier un amidon ou un dérivé d'amidon en vue de réduire sa viscosité, ce procédé consistant à traiter cet amidon ou ce dérivé d'amidon avec du peroxyde d'hydrogène en présence d'un catalyseur métallique, en particulier du sulfate de cuivre, et éventuellement d'un agent destiné à augmenter le pH de telle sorte que la teneur en matière sèche au début de la modification soit au moins égale à 60 %. L'invention concerne également l'utilisation de l'amidon modifié, notamment pour encoller du papier.
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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