Hydrogel fibers and fibrous structures
AssigneeCarl Freudenberg KG
InventorsWiebke Schmitz, Julia Schmidt, Bernd Schlesselmann, Gunter Scharfenberger
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Abstract
A plurality of fibers or one-dimensional, two-dimensional, or three-dimensional fibrous structures are provided, having fibers from a first raw fiber material. The first raw fiber material contains unsubstituted or partially substituted polyvinyl alcohol and/or unsubstituted or partially substituted polyvinyl alcohol copolymer. The fibers can be crosslinked by tempering the fibers or fibrous structures, with the result that the fibers or the fibrous structure are configured to be gel, in particular hydrogel, fibers or fibrous structures and have excellent stability.
Claims14
A plurality of fibers, comprising:
- at least 30 wt. % of first fibers made of a first raw fiber material consisting of an unsubstituted polyvinyl alcohol, a partially substituted polyvinyl alcohol, or a mixture thereof;
- and
- optionally, 1 wt % to 70 wt % of second fibers consisting of a polyolefin, polyamide, polyester, polyacrylonitrile, polyvinyl chloride, polyester amide, polyvinyl amine, polyvinyl acetate, polyethylene glycol, polyvinylpyrrolidone, polyurethane, gelatine, collagen, or a mixture of two or more of any of these,
- wherein the polyvinyl alcohol is directly cross-linked by tempering at a temperature of 100 to 200° C., such that cross-linked polyvinyl alcohol is present,
- wherein the first fibers have a fiber titer of 1.5 to 5 dtex,
- wherein the first and second fibers comprise no polyacrylate,
- wherein the plurality has an absorption capacity for 0.9% sodium chloride solution of from 300 to 3500% by weight as measured by DIN 53923, and
- wherein the plurality is configured to be gelling or hydrogelling and has a structural shrinkage of at most 60%.
Dependencies are inferred from the claim text.