Process for the peparation of finely divided, water-swellable po

Details Process for the peparation of finely divided, water-swellable po Process for the peparation of finely divided, water-swellable po

1991-10-25

1993-02-02

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carbohydrate or derivative as a reactant

527312, 527313, 527314, 527315, C08F25100, C08F 218, A61F 1315, A61L 1522

Patent

active

051838729

ABSTRACT:
Polysaccharide graft polymers are prepared by semi-continuous reverse-phase suspension polymerization, partial dewatering and crosslinking, wherein during and after the suspension polymerization, in which an aqueous solution of an at least partially neutralized, olefinically unsaturated carboxylic acid is added to a suspension of a polysaccharide in a nonpolar organic solvent, the viscosity is reduced by adding amphoteric ammonium compounds or quaternary imidazolinium salts to the reaction medium.

REFERENCES:
patent: 4131576 (1978-12-01), Iovine et al.
patent: 4464523 (1984-08-01), Neigel et al.
patent: 4777232 (1988-10-01), Heidel
patent: 5032659 (1991-07-01), Heidel
Billmeyer, Jr. "Textbook of Polymer Science" Third Edition, Wiley & Sons, New York 1984, pp. 126-127.

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