Lead/sulphuric acid-accumulator, separator for lead/sulphuric acid accumulators and process to reduce the formation of colored deposits in a lead/sulphuric acid accumulators

US6403264B1 · kind B1 · utility

Assignee

• DARAMIC, LLC · US

Inventors

• Hellmut Bunsch · Hamburg, DE
• Klaus Heinrich Ihmels · Hamburg, DE
• Frank Otto Theubert · Norderstedt, DE

Key dates

• Filing date: Dec 21, 1999
• Grant date: Jun 11, 2002
• Expiry date: Dec 21, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An invention is described through which it is possible to reduce in quantity the coloured, mostly dark, and frequently adhesive deposits which form in lead accumulators with separators of filled poly-olefins during formation and operation. The essential feature is that the separators contain as plasticizer a process oil with a CA value of ≦6%, a sulphur content of ≦2000 ppm and a polar part of ≦1%. Preferred process oils to be used as plasticizers are relatively naphthenic and naphthenic oils.