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US 5,246,637 AGranted
Method for producing electret filter
AssigneeMitsui Petrochemical Industries, Ltd.
InventorsSatoshi Matsuura, Akira Yokoyama, Yoshio Shinagawa
Life of this patent
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Abstract
A highly efficient, reliable method is provided for producing an electret filter having an excellent collection efficiency. In this method, a film containing a resin material with high molecular weight is formed and split to form split yarns. The split yarns are then subjected to a charging treatment, and the electret filter is produced from the charged split yarns.
Claims15
A method for producing an electret filter comprising the steps of
- forming a film comprising a high molecular weight resin material,
- wherein said high molecular weight resin material is a compound selected from the group consisting of a non-polar high molecular weight compound, a polar high molecular weight compound and a non-polar high molecular weight compound modified by graft polymerization and mixtures thereof,
- splitting the film to form split yarns,
- subjecting the split yarns to a homocharging, and
- producing the electret filter from the charged split yarns.
2 more elements
A method for producing an electret filter comprising the steps of forming a film comprising a high molecular weight resin material,
- wherein the resin material comprises in weight ratio 60 to 99 parts of a non-polar high molecular weight compound,
- 0.5 to 39.5 parts of a polar high molecular weight compound, and
- 0.5 to 20% by weight of a non-polar high molecular weight compound modified by graft polymerization,
- splitting the film to form split yarns,
- subjecting the split yarns to a homocharging and producing the electret filter from the charged split yarns.
2 more elements
Dependencies are inferred from the claim text.