Process for modifying amylaceous materials, the so obtained products and their applications, especially for the manufacture of paper, adhesives and gelified products

摘要

Transforming a starchy material comprises heating it at 60 - 100 degrees C for 5 - 30 minutes, in a dry phase with a chemical agent, to bring about hydrolysis. Starchy material is transformed by a continuous process of chemical fluidification in a dry phase, (i.e. less than 25% humidity, preferably 8 - 22% humidity), using a chemical agent having a hydrolyzing action, the temperature being 60 - 100 degrees C and the period of action being 5 - 30 minutes. The starchy material used may be any of the following: raw starch, flours, products resulting from the etherification, esterification, sulfonation, oxidation, cationization, hydroxy alkylation, and/or acetylation of these starches and flours, and their mixtures. The chemical agents used may be mineral or organic acids or (per)oxidizing agents, in liquid, solid, or gaseous form. The use of 0.01 - 0.4% hydrochloric or sulfuric acids, calculated on dry weight of starchy material, is especially preferred. During or after this process the product may be transformed by chemical modification, such as etherification, esterification, sulfonation, cationization, hydroxy alkylation or acetylation. Independent claims are also included for cationic starchy material having a water fluidity of at least 65, preferably 70 - 79, a nitrogen content of 0.3 - 0.5%, preferably 0.3 - 0.48% expressed in relation to the weight of dry cationic starchy material.