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US 7,452,593 B2Granted
Method of producing a porous plastic film, and plastic film
AssigneeValtion Teknillinen Tutkimuskeskus
InventorsMikko Karttunen, Satu Kortet, Mika Paajanen
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Abstract
A method of producing a porous plastic film, and a porous plastic film. The plastic film is prepared from a raw material blend comprising a polymer-containing basic material and an additive. Pores are generated in the film by stretching a film preform. The additive comprises a POS(S) chemical.
Claims23
A method of producing a porous plastic film, the method comprising:
- producing a stretchable preform from a raw material blend comprising a polymer-containing basic material and an additive;
- stretching the preform so as to form a film comprising pores;
- and
- charging the porous film by directing an electric field over the porous film, wherein,
- the additive comprises a POS(S) chemical,
- at least part of the POS(S) chemical is in agglomerates, and
- each agglomerate has a diameter in a range of 1 μm to 5 μm.
4 more elements
A porous plastic film produced from a raw material blend comprising:
- a basic material and an additive mixed therewith;
- a
- plurality of pores being arranged in the structure of the plastic film, the pores being produced by stretching a preform made from the raw material blend;
- and
- an electrical charge, wherein,
- the additive comprises a POS(S) chemical,
- at least part of the POS(S) chemical is in agglomerates, and
- each agglomerate has a diameter in a range of 1 μm to 5 μm.
5 more elements
Dependencies are inferred from the claim text.