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US 5,171,505 AGranted
Process for spinning polypeptide fibers
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert L. Lock
Life of this patent
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Abstract
Polypeptide fibers, fiber spinnable solutions, and a process for forming polypeptide fibers are disclosed. The invention includes forming polypeptide fibers from spinning solutions containing a polypeptide, and a solvent selected from the group consisting of hexafluoroisopropanol, and a mixture of formic acid and at least one lithium halide.
Claims17
A process for forming polypeptide fibers, comprising the steps of:
- a) forming a spinnable solution comprising 5% to 30% by weight of a polypeptide, in a solvent, selected from the group consisting of hexafluoroisopropanol, and a mixture of formic acid and at least one lithium halide, and
- b) extruding the solution through a spinneret.
A process for forming polypeptide fibers, comprising the steps of:
- a) forming a spinnable solution comprising 5% to 30% by weight of a polypeptide, urea, and hexafluoroiso*propanol;
- and
- b) extruding the solution through a spinneret.
A process for forming polypeptide fibers comprising the steps of:
- a) forming a spinnable solution comprising 5% to 30% by weight of a polypeptide, in a solvent, selected from the group consisting of hexafluoroisopropanol, a mixture of formic acid and lithium chloride, and a mixture of formic acid and lithium bromide;
- and
- b) extruding the solution through a spinneret.
Dependencies are inferred from the claim text.