초록 ▼

The present invention relates to a process for modifying hydrophilic polymers by mixing with a modifier, characterized in that the pulverulent polymer and the modifier are introduced continuously into a vertical, cylindrical mixer, mixed at a power of from 1,000 to 5,000 Wh/m.sup.3 of powder by mean

The present invention relates to a process for modifying hydrophilic polymers by mixing with a modifier, characterized in that the pulverulent polymer and the modifier are introduced continuously into a vertical, cylindrical mixer, mixed at a power of from 1,000 to 5,000 Wh/m.sup.3 of powder by means of rotating blades at a blade rate of from 100 to 300 s.sup.-1 at a residence time of 1-10 seconds, during which the powder is passed through zones having energy dissipation densities of 300-600 W/l of mixer volume.

대표청구항 ▼

[ What is claimed is:] [1.]1. Process for modifying hydrophilic polymers selected from a group consisting of homopolymers and copolymers of acrylic acid, methacrylic acid and acrylamido-propanesulphic acid and graft polymers of said hydrophilic monomer components on starch or polyalkylene oxides of

[ What is claimed is:] [1.]1. Process for modifying hydrophilic polymers selected from a group consisting of homopolymers and copolymers of acrylic acid, methacrylic acid and acrylamido-propanesulphic acid and graft polymers of said hydrophilic monomer components on starch or polyalkylene oxides of the general formula IR.sup.1 and R.sup.2 are H, alkyl or aryl, each of which is optionally substituted,X is H or --CH.sub.3 andn is a number from 1 to 10,000,by mixing with a modifier selected from a group consisting of ethylenediamine, diethylenetri-amine, ethylene glycol diglycidyl ether, propyylene glycol diglycidyl ether, polyethylene glycol diglycidylether, glycerol polyglycidyl ether and polyamidoamines comprising introducing continuously said modifier into a vertical cylindrical mixer being equipped with a rotating shaft which is mounted coaxially to the mixing tube and which has seated thereon 1 to 3 cutter heads, each cutter head having plurality of rotating blades, and mixing at a power of from 1,500 to 5,000 Wh/m.sup.3 of powder by means of said rotating blades at a blade rate of from 100 to 300 s.sup.-1 at a residence time of 1 to 10 seconds, during which the powder is passed through zones having energy dissipation densities of 300 to 600 W/l of mixer volume.