Brief description of the object of the physical properties of the products of paper, paper thus treated, the additive composition had use, the production of paper products, products of the paper obtained and to increase the resistance of the paper in the wet state

摘要

The invention relates to a process in order to improve the physical properties of the products of paper. / p & & p & according to the invention, it is possible to prepare an amine salt of the polymer of polyurethane in preparing a cap of the isocyanate prepolymer, which is composed of a mixture of 2,9 is approximately 50% by weight of a polyol cap of isocyanate having a hydroxyl functionality between 3 and 8 before be cap, and about 97,1 is approximately 50 by weight of a polyoxyethylene diol having a hydrophilic cover of the isocyanate of ethylene oxide content of at least 40 mol%, by react this prepolymer with about 0,8 a 1,2 population of a ketoxime chosen from the group consisting of acetone oxime, butanone oxime, cyclohexanone oxime and their mixtures in order to lock the nco groups of the prepolymer in order to form a prepolymer, which blocks the oxime, by react this prepolymer with an amine polyfunctional containing at least two functional groups and capable of forcing the polyurethane to harden at low temperatures, in order to form a reaction product of amine and by react this product with an organic or inorganic acid to form an amine salt of the polymer of polyurethane which hardens at low temperature, and highly miscible in water, it forms a piece of the system of paper, and it is thus intimately the salt in the product of paper, either before or after the formation of the piece, but before the passage of this piece in the stage of drying of the operation of the formation of paper in a quantity sufficient to produce a concentration of the salt of the order of 0,1 to approximately 10 based on the weight of the fibers dry. / p & & p & the invention applies in particular in the papermaking.