| abstract |
The present invention pertains to a method for continuous cross-linking water-soluble condensates and additives containing amino groups, involving at least bifunctional cross-linking reagents in an aqueous solution or organic solvents in water at a temperature of 20 DEG C to 180 DEG C, resulting in cross-linked reaction products which are water-soluble and characterized, for 20 wt. % of an aqueous solution at a temperature of 20 DEG C, by a viscosity of 50 to 2000 mPas. A mixture of water-soluble condensates and additives containing amino groups and cross-linking reagents, or both reaction partners, are continuously fed into a tubular reactor, inside which they circulate under laminal flow (Reynolds number: 0,005 - 500), then continuously polycondensated in a cylindrical stirrer, whereby the reagents involved in the reaction are let, from one side of a double coaxial cylinder, into the intermediate space between the inner cylinder and the outer cylinder for the purposes of polycondensation. At least one cylinder of the double coaxial cylinder is caused to rotate, with an angular speed relative to the other cylinder, thereby producing Taylor swirls (Taylor number: 20 to 2000) in the reaction mixture. Thereafter, the reaction mixture is isolated at the end of the reactor cycle. |