US 4,267,016 A · Polyvinyl alcohol fiber for binding a fibrous sheet and a process for the preparation thereof

Abstract

A water-soluble polyvinyl alcohol fiber is obtained by subjecting to the conventional dry or wet spinning process, a solution prepared by adding to a polyvinyl alcohol aqueous solution, an adduct composed of a polyamide condensation product and 1-halogen-2,3-epoxy propane or ethylene glycol diglycidyl ether in the range from 5 to 50 percent by weight based upon the polyvinyl alcohol-after the solution's pH has been adjusted to 2 to 7. The resulting fiber, which has not been subjected to any heat treatment at a temperature above 120.degree. C. is blended with a fibrous material to make a fibrous sheet such as paper or non-woven fabric. By virtue of a subsequent heat-treatment, said polyvinyl alcohol fiber becomes boiling water-resistant; as a result, the wet strength of the fibrous sheet is significantly increased.

Claims10

Dependent claims

A fibrous sheet exhibiting enhanced wet strength comprising a dispersion of paper stock fibers and from 2 to 30 percent by weight of polyvinyl alcohol fibers, said polyvinyl alcohol fiber comprising a water-soluble polyvinyl alcohol fiber containing from 5 to 50 percent by weight of an adduct comprising a polyamide condensation product and a 1-halogen-2,3-epoxy propane or ethylene glycol diglycidyl ether, said fiber, when not having been heat treated at a temperature about 120.degree. C., possesses the latent ability of becoming boiling-water resistant upon being heat treated at a temperature above 120.degree. C., said sheet having been heat treated at a temperature above 120.degree. C.

Dependencies are inferred from the claim text.

Polyvinyl alcohol fiber for binding a fibrous sheet and a process for the preparation thereof

Life of this patent

Polyvinyl alcohol fiber for binding a fibrous sheet and a process for the preparation thereof

Life of this patent

Abstract

Claims10