Method for obtaining an elongate polysaccharide element, in particular a chitosan thread
US9567406B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 4, 2011 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | Feb 11, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/431
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for obtaining an elongate polysaccharide element, in particular a chitosan thread, includes extruding a hydroalcoholic extrusible solution containing a polyalcohol of said polysaccharide through an extrusion die, coagulating the extruded solution by neutralization, and at least one operation of removing the polyalcohol. The ratio of water to polyalcohol in the extrusible solution is determined such as to obtain in the elongate element a polysaccharide with the crystalline structure thereof mainly in the form of an anhydrous allomorph. Since the polysaccharide used to prepare the extrusible solution has a weight-average molar mass Mw0, the polysaccharide in the elongate element obtained preferably has a weight-average molar mass Mw1 comprised between Mw0 and 0.7 Mw0. Since the purpose is to obtain a chitosan thread, the latter has properties of mechanical strength and flexibility that allow the thread to be tied into overhand knots and to be woven without breaking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.