Daramic, Inc.

Klaus Heinrich Ihmels

Jörg Deiters

Werner Bohnstedt

Jurgen Ruhoff

Karsten Fischer

Hellmut B&uuml;nsch

Frank Otto Theubert

The invention relates to a thermoplastic polymer-based battery separator, which contains a compound of formula R (OR)(COOM). In said formula, R represents a non-aromatic hydrocarbon group comprising between 10 and 4,200 carbon atoms, which can be interrupted by oxygen atoms, Rrepresents H, &#x2014;(CH)COOMor &#x2014;(CH)&#x2014;SOM, whereby k stands for 1 or 2, M represents an alkali or earth alkaline metal ion, Hor NH, whereby not all variables of M are defined simultaneously as H, n stands for 0 or 1, m stands for 0 or a whole number from 10 to 1,400 and x stands for 1 or 2. The ratio of oxygen atoms to carbon atoms in the compound according to the aforementioned formula ranges between 1:1.5 and 1:30 and n and m cannot simultaneously represent zero.

Battery separator with improved oxidation stability

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 C value of &lE;6%, a sulphur content of &lE;2000 ppm and a polar part of &lE;1%. Preferred process oils to be used as plasticizers are relatively naphthenic and naphthenic oils.

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

Separator for sealed lead accumulators

Process for repairing manufacturing defects in porous separator webs for accumulators in which a repair material is deposited in targeted manner onto the defect in-line repair as production of the separator web proceeds and the defect is thus sealed, or in which the defect is heated in-line at certain points and thereby welded. Suitable as repair materials are in particular polymers and/or resins dispersible in a dispersion agent, polymerizable materials and hot-melts. Welding preferably takes place using ultrasonics.

Process for repairing battery separators

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Hamburg, Germany

Klaus Heinrich Ihmels