Title: Battery separator manufacturing process

Abstract: Battery separators and the like are produced from non woven mats of thermoplastic fibers which fibers contain an internal wetting agent that is relatively insoluble in battery electrolite and tends to bloom under conditions of use. After preliminary formation the nonwoven mat is heated and then compressed to increase the effectiveness of the wetting agent. The fibers may be formed from polypropylene resin that is treated at unusually high temperatures prior to extrusion and the extrudate attenuated, collected on a drum and compressed to form a preferred separator with small pores and high porosity.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Palmer, Nigel Innes (Lexington, MA, US)
Sugarman, Nathan (Needham, MA, US)

Application Number: 537052
Filing Date: 1974-12-27
Publication_date: 1976-01-20
Assignee: W. R. Grace & Co. (Cambridge, MA)
Primary Class(es): 429/254 429/246, 429/250
Other Classes:
US Patent Ref:

3154436	Oct, 1964	Tomaino	136/146.
3387073	Jun, 1968	Larsen	264/211.
3627723	Dec, 1971	Kealy et al.	264/211.
3765948	Oct, 1973	Johnson	136/146.
3849241	Nov, 1974	Buntin	264/176.

Other Refs:
Primary Examiner: Walton, Donald L.
Assistant Examiner:
Attorney: Hanson, Jr.; Edward J., Parker; C. E.