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US 11,078,601 B2Granted
Compositions and methods for gel spinning of polyamides
AssigneeAdvanSix Resins & Chemicals LLC
InventorsTerry Chern, Nathan Heldenbrand, Yue Hu, John A. Young, David J. Loy, James A. Kweeder
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Abstract
A composition for forming a fiber includes at least one polyamide and caprolactam. The at least one polyamide has a number average molecular weight between 38,000 Da and 100,000 Da. The polyamide is at least partially dissolved in the caprolactam. The caprolactam comprises between 20 wt. % and 90 wt. % of the composition.
Claims12
A composition for forming a fiber, the composition comprising:
- at least one polyamide having a number average molecular weight between 38,000 Da and 88,000 Da, derived from formic acid viscosity (FAV) as determined according to ASTM D789 according to the relationship:
- Mn=4791.8×(log(FAV))2.4056 ;
- and
- caprolactam, wherein the polyamide is at least partially dissolved in the caprolactam, the caprolactam comprising between 30 wt. % and 90 wt. % of the composition.
1 more element
A method of producing a fiber, the method comprising:
- dissolving at least one polyamide having a number average molecular weight between 38,000 Da and 88,000 Da, derived from formic acid viscosity (FAV) as determined according to ASTM D789 according to the relationship:
- Mn=4791.8×(log(FAV))2.4056, into caprolactam to form a spinnable solution;
- and
- spinning the spinnable solution by extruding the spinnable solution through a spinneret to form the fiber, wherein the spinnable solution includes between 30 wt. % and 90 wt. % caprolactam.
1 more element
Dependencies are inferred from the claim text.