Patent ID: 6403264
Filing Date: 2002-06-11
Classification: C08K,C08L,H01M,Y02E

Abstract:
In a lead/sulfuric acid accumulator having a series of positive plates and negative plates and one or more separators made from a microporous filled polyolefin and the one or more separators containing a process oil as a plasticizer, the process oil being selected from the group consisting of naphthenic oil, relatively naphthenic oil and paraffinic oil and containing an aromatic carbon, sulfur and polar part, the improvement consisting essentially of the process oil having an aromatic carbon value (CA, according to DIN 51378, without sulfur correction) of &lE;6%, sulphur content of &lE;2000 ppm and a polar part of &lE;1%, with the proviso that in the case that said process oil is a paraffinic oil, said aromatic carbon value is more than 0.1% and said sulphur content is greater than 100 ppm.