- Patent Title: 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
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Application No.: US16470270Application Date: 2017-12-15
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Publication No.: US11560456B2Publication Date: 2023-01-24
- Inventor: Monica Haag , Stephan Deuerlein , Roland Krauss , Volker Klock , Holger Barthel
- Applicant: BASF SE
- Applicant Address: DE Ludwigshafen am Rhein
- Assignee: BASF SE
- Current Assignee: BASF SE
- Current Assignee Address: DE Ludwigshafen am Rhein
- Agency: Marshall, Gerstein & Borun LLP
- Priority: EP16205991 20161221
- International Application: PCT/EP2017/083106 WO 20171215
- International Announcement: WO2018/114702 WO 20180628
- Main IPC: C08J3/075
- IPC: C08J3/075 ; B29C48/68 ; B29C48/00 ; B29C48/395 ; B29C48/53 ; B29C48/625 ; B29C48/685 ; B29B7/42 ; B29B7/82 ; B29C48/05 ; B29C48/345 ; B29C48/535 ; B29C48/04 ; C08J3/24
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.
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