Shaped objects for pyrogen retention and processes for their manufacture

US6632361B2 · kind B2 · utility

Assignee

• Membrana GmbH · DE

Inventors

• Thorsten Niklas · Marburg, DE
• Friedbert Wechs · Bad Mergentheim, DE
• Annekatrin Nothdurft · Elsenfeld, DE

Key dates

• Filing date: Dec 22, 2000
• Grant date: Oct 14, 2003
• Expiry date: Feb 14, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F1/444
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention describes hydrophilically acting shaped objects, in particular semipermeable membranes for pyrogen retention, comprising a synthetic polymer component and an additive made from a copolymer made from vinylpyrrolidone and a vinylimidazole compound, and furthermore processes for manufacturing the shaped objects. The shaped objects of the invention exhibit such a high pyrogen retention capacity that the pyrogen concentrations present in the filtrates are in part below the detection limit of the gel clot LAL test.