Flame spread barrier made from mechanically delaminated vermiculite sheet
AssigneeHercules Incorporated
InventorsHerbert T. Conner, David H. Dumas, Lawrence L. Nelson
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Abstract
One or more layers of a sheet comprising (1) 60% to 99%, based on the weight of solids, of vermiculite delaminated by mechanical means only, (2) 1% to 40%, based on the weight of solids, of at least one fibrous material and (3) 0.1% to 4%, based on the weight of the vermiculite, of at least one flocculating agent, can be used to protect heat-sensitive substrates such as resin matrix composites from fire or heat.
Claims19
A structure comprising a heat-sensitive substrate and a vermiculite-filled fibrous sheet comprising (1) from about 60% to about 99%, based on the weight of solids, of vermiculite delaminated by mechanical means only and having a particle size of less than 200 microns, (2) from 1% to about 40%, based on the weight of solids, of at least one fibrous material and (3) from 0.1% to about 4%, based on the weight of the vermiculite, of a combination of a cationic and an anionic flocculant.
A process for protecting a heat-sensitive substrate from fire and/or heat comprising positioning a vermiculite-filled fibrous sheet adjacent to the substrate, said sheet comprising (1) from about 60% to about 99%, based on the weight of solids, of vermiculite delaminated by mechanical shearing only and having a particle size of less than 200 microns, (2) from 1% to about 40% of at least one fibrous material, based on the weight of solids, and (3) from 0.1% to about 4%, based on the weight of vermiculite, of a combination of a cationic and an anionic flocculant.
Dependencies are inferred from the claim text.