Patent · US Expired

Process for modifying hydrophilic polymers

US6300423A · kind A · utility

34Cited by

1References

12Claims

0Family size

Assignee

Cassella Aktiengesellschaft · DE

Inventors

Friedrich Engelhardt · Frankfurt, DE
Uwe Stuven · Bad Soden, DE
Manfred Mayer · Niedernhausen, DE

Key dates

Filing date	Apr 21, 1994
Grant date	Oct 9, 2001
Priority date	—
Expiry date	Apr 21, 2014

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J3/203
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.