Patent ID: 8420803
Filing Date: 2013-04-16
Classification: B29C,B29K,C08B,C08J,C08L

Abstract:
1. Continuous extrusion process for preparing cold water swelling phosphate-cross-linked starch derivatives, wherein the process comprises the steps of gelatinising an alkaline starch in a first zone ( 10 ) in an extruder; adding of POCl 3 as cross-linking reagent in a second zone ( 11 ) in the extruder; cross-linking the obtained gelatinised starch by means of the POCl 3 in the second and third zone ( 11 , 12 ) in the extruder, and neutralising the obtained cross-linked gelatinised starch that is present in a fourth zone ( 13 ) in the extruder; and recovering the obtained cross-linked, gelatinised starch in a fifth zone ( 14 ) in the extruder.