Production of filled polyolefin molding compound and the molding of articles therefrom

Claim 1

IN A METHOD OF MAKING A BATTERY PLATE SEPARATOR, THE STEPS COMPRISING; FORMING AN ACID RESISTING POLYOLEFIN TAKEN FROM THE CLASS CONSISTING OF POLYETHYLENE, POLYPROPYLENE AND COPOLYMERS THEREOF, IN SITU FROM A MONOMERIC MATERIAL DIRECTLY UPON THE SURFACES OF A FILLER MATERIAL SUSPENDED IN A NON AQUEOUS LIQUID TOGETHER WITH A CATALYST CONSISTING OF ETHYL ALUMINUM SESQUIBROMIDE AND AN ORGANIC TITANATE TAKEN FROM THE CLASS CONSISTING OF TETRA 2 ETHYLHEXYLORTHOTITANATE, TETRATIDECYLORTHOTITANATE AND TETRALAURYLORTHOTITANATE, SAID FILLER MATERIAL BEING TAKEN FROM THE CLASS CONSISTING OF ALPHA CELLULOSE, DIATOMACEOUS EARTH, SILICA GEL AND BENTONITE, REMOVING THE THUS COATED DISCRETE PARTICLES OF FILLER MATERIAL FROM AID LIQUID, FORMING THE COATED MATERIAL INTO A MAT AND THEN SINTERING THE MAT TO FORM A MICROPOROUS BATTERY SEPARATOR CONSISTING OF A CONTINUOUS PHASE OF THE POLYOLEFIN HAVING THE FILLER MATERIAL IN A DISPERSED PHASE THERETHROUGH.