| 摘要 |
<p>PROCESS FOR MANUFACTURING ULTRA-THIN SINTERED PVC BATTERY SEPARATORS Dry mixed and sintered PVC battery separators having predetermined thicknesses less than 0.012 inch, porosities greater than about 50%, and pores sufficiently small to substantially prevent interplate "treeing" (i.e., less than about 10 microns average) are produced by: mixing about 3% to about 15% by volume of leachable, pore-forming particles with the PVC particles; scraping the particle mix into a layer less than about 0.012 inch thick; sintering the PVC into a continuous strip; cooling the strip to a temperature of about 250.degree. F. to about 300.degree.F., and thereat compressing it to a thickness no greater than about 50% of its as-sintered thickness; while still warm, allowing the strip to recover much, but not all, of its as-sintered thickness; and cooling the strip to substantially fix the separator thickness at the recovered thickness. The leachable, pore-forming particles are preferably formed in situ by the thermal degradation of a gasifiable filler such as sodium bicarbonate.</p> |
