C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
C08B 31/18 (2006.01) C08B 30/18 (2006.01) C08B 31/00 (2006.01) D21H 17/28 (2006.01) D21H 21/16 (2006.01)
Patent
CA 2457887
The invention relates to a method for the modification of starch in such a way that it is suitable for surface sizing at high dry matter contents of > 15%, typically > 20%, even more than 25%. The modification of starch comprises at least degradation and stabilisation of the starch, whereby the degradation of starch is carried out by means of a chemical treatment, such as hypochlorite oxidation or acid treatment, to such a degree of degradation at which the viscosity of the surface size prepared from the starch, calculated to a dry matter content of 10% and to a temperature of 60~C, still is at > 10 mPas, typically > 20 mPas, most typically > 25 mPas, Brookfield RVTD II 100 rpm. The invention also relates to a starch intended for use in surface sizing at a high dry matter content and its use in surface sizing.
La présente invention concerne un procédé de modification d'amidon de façon que ce dernier convienne pour le collage en surface à contenus riches en matière sèche > 15 %, habituellement > 20 % et même > 25 %. La modification de l'amidon comprend au moins la dégradation et la stabilisation de cet amidon. La dégradation de l'amidon est conduite à l'aide d'un traitement chimique tel qu'une oxydation d'hypochlorite ou qu'un traitement à l'acide, à un stade de dégradation dans lequel la viscosité de la colle de surface préparée à partir de l'amidon calculée pour un contenu en matière sèche de 10 % et une température de 60?0¿ C, est toujours > 10mPas, habituellement > 20mPas et le plus fréquemment > 25 mPas, avec un viscosimètre Brookfield RVTD II tournant à 100 tours/minute. Cette invention concerne aussi un amidon destiné au collage en surface à contenus riches en matière sèche et l'utilisation de cet amidon dans le collage en surface.
Bruun Stig-Erik
Ketola Hannu
Laine Timo
Chemigate Oy
Gowling Lafleur Henderson Llp
Raisio Chemicals Ltd
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