Abstract:
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 DEG 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.
Abstract:
The invention relates to a liquid finishing agent based on a degraded starch which is stabilized by a reducing agent. The invention further relates to a process for preparing said finishing agent and to its use in several applications, such as in finishing textile and blanket adhesives.
Abstract:
Die Erfindung betrifft ein Verfahren yur Oxidation von Stärke zurGewing von Carbonyl-substituerter Stärke unter Verwendung von V, Cr, Mn, Fe, Co, oder Cu, wobei Fe und/oder Cu bevorzugt sind als Katalysator. Ihre Oxidation erfolgt in quasi-trockener Form durchBesprühen der trockenen Stärke mit Lösungen enthaltend Wasserstoffperoxid und/oder den Katalysator und Durchmischen des befeuchteten pulvers. Erhältlich ist oxidierte Stärke mit bis zu etwa 10 Carbonylgruppen pro 100 Glucoseeinheiten.
Abstract:
The invention relates to a liquid finishing agent based on a degraded starch which is stabilized by a reducing agent. The invention further relates to a process for preparing said finishing agent and to its use in several applications, such as in finishing textile and blanket adhesives.
Abstract:
The invention pertains to a process for the regeneration and recovery of periodate from a spent iodate solution, by reacting the iodate with at least an equimolar amount of peroxosulphate. The regenerated periodate is especially suitable for oxidising carbohydrates to dialdehyde carbohydrates. The oxidation and regeneration can also be carried out in a single stage using a catalytic amount of periodate only.
Abstract:
The invention provides a method of preparing a stable enzyme-thinned starch dispersion characterized by a selected degree of thinning including the steps of: (a) combining a derivatized granular starch with an alpha-amylase enzyme to form a starch/enzyme slurry; (b) passing said starch/enzyme slurry through a jet cooker under conditions selected to gelatinize the starch; (c) treating the starch/enzyme slurry to complete gelatinization and achieve the selected degree of thinning such that the concentration of starch hydrolyzate product having a molecular weight greater than 1,000,000 daltons is 5 % or greater; and (d) deactivating the enzyme.
Abstract:
The invention provides a process of producing a superabsorbent polysaccharide derivative by oxidation of a alpha -glucan, glucomannan or galactomannan to introduce aldehyde functions, the oxidised poly-saccharide subsequently being reacted with sulphur dioxide or an equivalent thereof to produce a hydroxysulphonated polysaccharide. The polysaccharide may be crosslinked before or after the oxidation. The preferred polysaccharide is starch or guar.
Abstract:
A temporary wet strength polymer and compositions for paper products, e.g., toilet tissue, is disclosed. The temporary wet strength polymer is the oxidation product of an esterified polyhydroxy polymer, more preferably of an esterified polysaccharide. The esterified polymer compound is formed by reacting the polyhydroxy polymer with a 1,2-disubstituted alkene compound that has at least one carboxylic acid group. The temporary wet strength polymer provides paper products having an initial wet strength that enables use of the product in the moistened condition, along with a suitable wet strength decay rate.
Abstract:
The invention relates to a method for the oxidation of starches or starch derivatives with ozone in an aqueous medium, wherein at least a part of the primary hydroxyl groups are selectively oxidized. In particular, root starches, such as tapioca starch, tuber starches, such as potato starch, and waxy cereal starches, such as waxy maize starch, are treated using the method according to the invention.
Abstract:
In a method of oxidising carbohydrates, particularly starch and dextrin, the oxidation is effected by molecular oxygen in an alkaline aqueous medium in the presence of a catalytic quantity of a metal ion selected from the metals of group VIII of the periodic table, copper or silver and a substance which acts as a ligand for the metal ion and is preferably constituted by a polydentate amine ligand.