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US 12,305,336 B2Granted
Ply fibrous product
AssigneeEssity Hygiene and Health Aktiebolag
InventorsUlrika Husmark, Frida Ryttsén
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AssigneeEssity Hygiene and Health Aktiebolag
InventorsUlrika Husmark, Frida Ryttsén
Estimating the term…
A ply fibrous product comprises at least one ply selected from a nonwoven ply and a tissue paper ply, wherein the at least one ply selected from a nonwoven ply and a tissue paper ply comprises cellulosic fibers comprising an organic polycarboxylic acid and wherein the organic polycarboxylic acid has at least one carboxyl group covalently bound to the cellulosic fibers and at least one free carboxyl group. Due to the presence of covalent chemical bonds between a carboxyl group of the polycarboxylic acid and hydroxy groups of the cellulosic fibers present in all substrates, the ply fibrous products display a long-lasting acidic pH even after having been rinsed with water. In some embodiments a long-lasting acidic pH may be achieved in the nonwovens treated with an organic polycarboxylic acid even after washing with a washing detergent.
A ply fibrous product comprising at least one nonwoven ply, wherein the nonwoven ply comprises cellulosic fibers, wherein said nonwoven ply is treated with an organic polycarboxylic acid, and wherein the organic polycarboxylic acid has at least one carboxyl group covalently bound to the cellulosic fibers and at least one free carboxyl group, wherein a surface of the ply fibrous product has a pH after washing in a range of from 2.0 to 5.0, and
Method for producing a ply fibrous product comprising at least one nonwoven ply, wherein the nonwoven ply comprises cellulosic fibers, the method comprising the steps of
Dependencies are inferred from the claim text.