Abstract: Mixtures of polyvinylamines and of liquid compositions of cationic amylaceous materials having very specific characteristics in terms of dry matter, viscosity, nitrogen content and pH. With such mixtures, it is possible to produce preparations that are particularly effective at increasing the dry strength of paper and cardboard. Also, the use of such mixtures for the production of paper and cardboard, the corresponding production method and the resulting paper and cardboard.

Abstract: A process for making an aqueous solution containing solids in suspension drinkable, includes a coagulation-flocculation step, which includes the steps of: a) adding coagulants to the aqueous solution to be treated; b) stirring the aqueous solution to which coagulants were thus added; c) separating the coagulated solids by settling out or flotation; d) recovering purified water; wherein the coagulants added in step a) include metal salts chosen from ferric salts and aluminum salts, and also a liquid starchy composition including a cationic waxy starch, the cationic starch having, when it is placed in the form of an aqueous composition, a viscosity, measured according to a test A, greater than 100 mPa·s and less than 1000 mPa·s, this test A consisting in adjusting the dry weight of cationic waxy starch of the aqueous composition to 10% and then measuring the Brookfield viscosity at 25° C. of the resulting composition.

Abstract: Mixtures of polyvinylamines and of liquid compositions of cationic amylaceous materials having very specific characteristics in terms of dry matter, viscosity, nitrogen content and pH. With such mixtures, it is possible to produce preparations that are particularly effective at increasing the dry strength of paper and cardboard. Also, the use of such mixtures for the production of paper and cardboard, the corresponding production method and the resulting paper and cardboard.

Abstract: Novel aqueous suspensions containing a very specific filler/binder pair, in particular a filler based on titanium dioxide and a binder in the form of a liquid composition of cationic amylaceous material having very specific characteristics in terms of dry matter, viscosity, nitrogen content and pH. A method for producing the suspensions, the use of the suspensions for the production of paper and cardboard and the resulting paper and cardboard are also described.

Abstract: An aqueous adhesive composition intended for assembly of corrugated cardboard, consisting of a primary part and a secondary part, wherein the secondary part is made from a mixture including at least one legume starch and at least one cereal and/or tuber starch. A process for preparing corrugated cardboard using such a composition, and the corrugated cardboard thus obtained are also disclosed.

Abstract: A novel cationic liquid starchy composition and uses thereof in industry, in particular, as an additive in paper and cardboard production, as an additive for treatment of industrial water, either from paper or cardboard production or not, or for the preparation of such additives. The cationic liquid starchy composition is characterized by selected dry material, viscosity, total nitrogen content and pH values. The viscosity is 200 mPa·s with a maximum of 1000 mPa·s, (according to a T test). The nitrogen content is at least 0.6% with a maximum of 1.4% (dry/dry). The cationic liquid starchy composition can contain, at least one polyol, preferably a saccharide and used as is or after dilution. The composition is particularly suitable, for the preparation of adhesive agents, particularly of the ASA type for bringing into contact, directly or not, with a fiber composition having a raised calcium ion content.

Abstract: An adhesive composition includes an aqueous dispersion having a primary part, consisting essentially of a gelatinized starch, and a secondary part, comprising essentially a non-gelatinized starch and/or a swollen starch, wherein the starch of the secondary part is a native legume starch, and the starch of the primary part is optionally a native or modified legume starch, the legume starches having an amylose content ranging between 30 and 52%. The invention also concerns the method for preparing such a composition, comprising its use, assembling the parts and drying and satisfying the requirements of modern fast machinery.

Abstract: A novel cationic liquid starchy composition and uses thereof in industry, in particular, as an additive in paper and cardboard production, as an additive for treatment of industrial water, either from paper or cardboard production or not, or for the preparation of such additives. The cationic liquid starchy composition is characterised by selected dry material, viscosity, total nitrogen content and pH values. The viscosity is 200 mPa·s with a maximum of 1000 mPa·s, (according to a T test). The nitrogen content is at least 0.6% with a maximum of 1.4% (dry/dry). The cationic liquid starchy composition can contain, at least one polyol, preferably a saccharide and used as is or after dilution. The composition is particularly suitable, for the preparation of adhesive agents, particularly of the ASA type for bringing into contact, directly or not, with a fibre composition having a raised calcium ion content.

Abstract: An aqueous adhesive composition intended for assembly of corrugated cardboard, consisting of a primary part and a secondary part, wherein the secondary part is made from a mixture including at least one legume starch and at least one cereal and/or tuber starch. A process for preparing corrugated cardboard using such a composition, and the corrugated cardboard thus obtained are also disclosed.