High cohesive strength composite materials and, E.G., cigarette filters shaped therefrom
AssigneeRhodia Operations
InventorsRobert Eberhardt, Eric Perin
Life of this patent
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Abstract
Composite materials having high cohesive strength, formed from at least one polymer and from at least one compound selected from among mineral oxides, aluminosilicates and active carbon, are characterized by a mean particle size of at least 100 mm, a pore volume (Vd1) formed by pores having a diameter ranging from 3.6 to 1,000 nm, equal to at least 0.2 cm3/g, a cohesive strength such that its content of particles having a size of less than 100 mm, obtained after being subjected to an air pressure of 2 bar, of less than 1.5%, preferably 0.0%, by volume; such composite materials are formed into useful liquid supports, catalyst supports, additives, or liquid or gas filters, in particular into cigarette filters.
Claims34
A composite material comprised of at least one polymer (P) selected from celluloses, starches, and derivatives thereof and at least one compound (C) selected from mineral oxides, silicoaluminates and activated carbon, wherein the composite material has:
- a median particle size of at least 100 μm;
- a pore volume (Vd1), made up of pores of diameters ranging from 3.6 to 1,000 nm, of at least 0.2 cm3/g;
- and
- a cohesion such that the amount of particles thereof having a size of less than 100 μm, obtained after an air pressure stress of 2 bar, is less than 1.5% by volume.
Dependencies are inferred from the claim text.