Method for preparing fibrous mats from a fibrous suspension
AssigneeThe Dow Chemical Company
InventorGeorge R. Killat
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Abstract
Nonwoven mats or sheets having improved tensile strengths are prepared from a fibrous suspension of synthetic fibers thickened with a synthetic, addition polymer bearing pendant carboxamide groups and a cross-linking agent for the polymeric thickener. For example, a fibrous suspension comprising glass fibers, a polymer of acrylamide and a water-soluble hypohalite can be employed to prepare strong, glass fiber mats useful as effective reinforcement for roofing shingles.
Claims16
An improved method for preparing a fibrous mat or sheet by depositing a layer of a thickened fibrous suspension of synthetic fibers and an aqueous suspending medium thickened by a carboxamide synthetic addition polymer on a support, removing substantially all of said suspending medium to leave a fibrous mat with a residuum of a minor amount of said carboxamide polymer on the fibers, the improvement wherein said carboxamide polymer is reacted with a hypohalite to form a reaction product in said suspending medium, which as said residuum will cross-link to provide a fibrous mat of improved strength.
A thickened, fibrous suspension comprising an aqueous suspension of synthetic fibers thickened with a synthetic carboxamide polymer and an amount of a water-soluble hypohalite cross-linking agent for the polymeric thickener such that a fibrous mat or sheet prepared from the thickened, fibrous suspension exhibit increased tensile strength.
Dependencies are inferred from the claim text.