Patent · US Active

Single-shaft extruder and use of a single-shaft extruder, and method for altering morphology of a superabsorbent polymer, specifically an SAP polymer gel, using a single-shaft extruder

US11560456B2 · kind B2 · utility

0Cited by

15References

22Claims

0Family size

Assignee

BASF SE

Inventors

Monica Haag · Ludwigshafen, DE
Stephan Deuerlein · Ludwigshafen, DE
Roland Krauss · Neustadt, DE
Volker Klock · Ludwigshafen, DE
Holger Barthel · Oftersheim, DE

Key dates

Filing date	Dec 15, 2017
Grant date	Jan 24, 2023
Priority date	—
Expiry date	Jan 23, 2040

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2333/02
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A single-screw extruder for changing a morphology of superabsorbent polymer gel. The single-screw extruder has an input aperture, a channel, a screw and an output aperture. The screw in the invention has a first pitch value of a pitch of the screw flights along the conveying zone of the channel and, following in conveying direction, has a second pitch value of the pitch of the screw flights along the conveying zone of the channel, where the second pitch value is smaller than the first pitch value.

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