Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By treating occluded solids
Patent
1979-06-27
1981-02-24
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By treating occluded solids
264 54, 264126, 264DIG5, 429254, B29D 2700, B29D 2708
Patent
active
042527562
ABSTRACT:
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; compressing the strip in the temperature range of about 250.degree. F.-450.degree. F. to a thickness no greater than about 50% of its as-sintered thickness; thereafter immediately 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.
REFERENCES:
patent: 3002040 (1961-09-01), Orsino et al.
patent: 3123654 (1964-03-01), Malischewski
patent: 3518332 (1970-06-01), Sklarchuk et al.
patent: 3551210 (1970-12-01), Bahler et al.
patent: 3784490 (1974-01-01), Rainer et al.
Anderson Philip
General Motors Corporation
Plant Lawrence B.
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