POLYMER COMPOSITION FOR PREPARING MICROPOROUS PLASTIC SEPARATOR Russian patent published in 2005 - IPC

FIELD: polymer materials.

SUBSTANCE: invention relates to composition based on powderlike emulsion polyvinylchloride efficiently processed into microporous plastic separator to separate opposite-charge electrodes of lead accumulators. Composition containing 85-95% emulsion polyvinylchloride, preferably the one with Fikentcher constant equal to 62-69, and 5-15% suspension polyvinylchloride with Fikentcher constant equal to 80-110. Composition is characterized by thermostability 342-365 sec. Caking of composition leads to separators with following properties: volume porosity 40.0-50.3%, resistivity of equivalent layer 0.25-0.30 cm, rupture strength 5.2-6.7 MPa, and maximum pore size 28.0-31.0 μm. Hourly productivity of caking draw frame is 242-250 m2 separators.

EFFECT: increased volume porosity and lowered resistivity of equivalent layer of microporous plastic separator.

2 cl, 1 tbl