Intumescent sheet material
AssigneeMinnesota Mining and Manufacturing Company
InventorRoger L. Langer
Life of this patent
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Abstract
The invention provides an intumescent sheet material comprising 20 to 80 dry weight percent of at least one unexpanded intumescent material, 10 to 40 dry weight percent of at least one processed vermiculite selected from ground expanded vermiculite and delaminated vermiculite, greater than 0 to 5 dry weight percent of inorganic fibers having diameters greater than 5 microns, and greater than 0 to 10 dry weight percent of organic fibers; wherein said sheet material comprises substantially no ceramic fibers of less than 5 microns.
Claims20
A pollution control device comprising:
- (a) a housing:
- (b) a pollution control element disposed within said housing;
- and
- (c) a flexible intumescent sheet material comprising 20 to 80 dry weight percent of at least one unexpanded intumescent material, 10 to 40 dry weight percent of vermiculite platelets selected from at least one of expanded vermiculite ground into platelets and expanded vermiculite delaminated into platelets, greater than 0 to 5 dry weight percent of inorganic fibers having diameters greater than 5 microns, and greater than 0 to 10 dry weight percent of organic fibers;
- wherein said sheet material comprises substantially no ceramic fibers having a diameter of less than 5 microns, said sheet material being disposed between said pollution control element and said housing.
A process of forming a flexible intumescent mat comprising the steps of:
- forming expanded vermiculite;
- processing the expanded vermiculite into platelets;
- forming a slurry by mixing, in aqueous solution, components comprising:
- 20 to 80 dry weight percent of at least one unexpanded intumescent material;
- 10 to 40 dry weight percent of the platelets;
- greater than 0 to 5 dry weight percent of inorganic fibers having diameters greater than 5 microns;
- and
- greater than 0 to 10 dry weight percent of organic fibers;
- the components having substantially no ceramic fibers having a diameter of less than 5 microns;
- and
- drying the slurry to form a flexible mat.
A flexible intumescent sheet material consisting essentially of 20 to 80 dry weight percent of at least one unexpanded intumescent material, 10 to 40 dry weight percent of vermiculite platelets selected from at least one of expanded vermiculite ground into platelets and expanded vermiculite delaminated into platelets, greater than 0 to 10 dry weight percent of inorganic fibers having diameters greater than 5 microns, greater than 0 to 10 dry weight percent of organic fibers and greater than 0 to less than 1 dry weight percent of glass fibers having a diameter of less than about 2 microns, and substantially no ceramic fibers having a diameter of less than 5 microns.
Dependencies are inferred from the claim text.