초록 ▼

Non-thermoplastic starch fibers having no melting point and having apparent peak wet tensile stress greater than about 0.2 MegaPascals (MPa). The fibers can be manufactured from a composition comprising a modified starch and a cross-linking agent. The composition can have a shear viscosity from abou

Non-thermoplastic starch fibers having no melting point and having apparent peak wet tensile stress greater than about 0.2 MegaPascals (MPa). The fibers can be manufactured from a composition comprising a modified starch and a cross-linking agent. The composition can have a shear viscosity from about 1 Pascal쨌Seconds to about 80 Pascal쨌Seconds and an apparent extensional viscosity in the range of from about 150 Pascal쨌Seconds to about 13,000 Pascal쨌Seconds. The composition can comprise from about 50% to about 75% by weight of a modified starch; from about 0.1% to about 10% by weight of an aldehyde cross-linking agent; and from about 25% to about 50% by weight of water. Prior to cross-linking, the modified starch can have a weight average molecular weight greater than about 100,000 g/mol.

대표청구항 ▼

What is claimed is: 1. A starch fiber having an apparent peak wet tensile stress greater than about 0.2 MegaPascals (MPa). 2. The fiber according to claim 1, wherein the apparent peak wet tensile stress of the fiber is greater than about 0.5 MPa. 3. The fiber according to claim 1, wherein the a

What is claimed is: 1. A starch fiber having an apparent peak wet tensile stress greater than about 0.2 MegaPascals (MPa). 2. The fiber according to claim 1, wherein the apparent peak wet tensile stress of the fiber is greater than about 0.5 MPa. 3. The fiber according to claim 1, wherein the apparent peak wet tensile stress of the fiber is greater than about 1.0 MPa. 4. The fiber according to claim 1, wherein the apparent peak wet tensile stress of the fiber is greater than about 2.0 MPa. 5. The fiber according to claim 1, wherein the apparent peak wet tensile stress of the fiber is greater than about 3.0 MPa. 6. The fiber according to claim 1 wherein the fiber comprises crosslinked starch. 7. The fiber according to claim 1, wherein the fiber is manufactured from a composition comprising a starch and a cross-linking agent. 8. The fiber according to claim 7 wherein the starch comprises a modified starch. 9. The fiber according to claim 7 wherein the starch comprises an oxidized starch. 10. The fiber according to claim 7, wherein the cross-linking agent comprises an aldehyde cross-linking agent selected from the group consisting of formaldehyde, glyoxal, glutaraldehyde, urea glyoxal resin, urea formaldehyde resin, melamine formaldehyde resin, methylated ethylene urea glyoxal resin, and any combination thereof. 11. The fiber according to claim 7, wherein the composition further comprises a polycationic compound selected from the group consisting of divalent or trivalent metal ion salts, natural polycationic polymers, synthetic polycationic polymers, and any combination thereof. 12. The fiber according to claim 11, wherein the divalent or trivalent metal ion salt is selected from the group consisting of calcium chloride, calcium nitrate, magnesium chloride, magnesium nitrate, ferric chloride, ferrous chloride, zinc chloride, zinc nitrate, aluminum sulfate, ammonium zirconium carbonate, and any combination thereof. 13. The fiber according to claim 7, wherein the composition further comprises an acid catalyst in the amount sufficient to provide a pH of the composition in the range from about 1.5 to about 5.0. 14. The fiber according to claim 13, wherein the acid catalyst is selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, citric acid, and any combination thereof. 15. The fiber according to claim 7, wherein the composition has a shear viscosity from about 1 Pascal쨌Seconds to about 80 Pascal쨌Seconds measured at the processing temperature and at a shear rate of 3000 sec-1. 16. The fiber according to claim 7, wherein the composition has an apparent extensional viscosity from about 150 Pascal쨌Seconds to about 13,000 Pascal쨌Seconds measured at the processing temperature and at an extension rate of about 90 sec-1. 17. The fiber according to claim 7, wherein the starch has a weight average molecular weight greater than about 100,000 g/mol. 18. The fiber according to claim 1, wherein the fiber has an average equivalent diameter of less than about 20 microns. 19. The fiber according to claim 1, wherein the fiber has an average equivalent diameter of less than about 10 microns. 20. The fiber according to claim 1, wherein the fiber has an average equivalent diameter of less than about 6 microns.