Back to results
US 12,173,430 B2Granted
Process for producing carbon fibers and carbon fibers made therefrom
AssigneeCytec Industries Inc.
InventorsJeremy Moskowitz, Thomas Taylor, Amy Tucker, Alan Thomas, Billy Harmon
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to a process for producing carbon fibers utilizing a salt of an organic cation containing C═N imine group, and carbon fibers produced by such process.
Claims17
A process for producing carbon fibers, the process comprising:
- a) preparing a polymer solution comprising polyacrylonitrile (PAN) polymer
- b) spinning the polymer solution in step (a) by wet spinning or air-gap spinning to form carbon fiber precursor fibers, wherein spinning the polymer solution comprises filtering and extruding the polymer solution into a coagulation bath;
- c) drawing the carbon fiber precursor fibers through one or more draw and wash baths, resulting in drawn carbon fiber precursor fibers that are substantially free of solvent;
- and
- d) oxidizing the drawn carbon fiber precursor fibers of step c) to form stabilized carbon fiber precursor fibers and then carbonizing the stabilized carbon fiber precursor fiber thereby producing carbon fibers;
- wherein at least one salt of an organic cation containing a C═N imine group is added to the polymer solution in step a) and/or to the coagulation bath in step b);
- wherein at step a) comprises polymerizing acrylonitrile with one or more co-monomer(s) in a medium in which the resulting PAN polymer is sparingly soluble or non-soluble to form a mixture, adding the salt of an organic cation containing a C═N imine group to the mixture, isolating the resulting polymer, and dissolving the resulting polymer in one or more solvents to form the polymer solution.
4 more elements
A process for producing carbon fibers, the process comprising:
- a) preparing a polymer solution comprising polyacrylonitrile (PAN) polymer
- b) spinning the polymer solution in step (a) by wet spinning or air-gap spinning to form carbon fiber precursor fibers, wherein spinning the polymer solution comprises filtering and extruding the polymer solution into a coagulation bath;
- c) drawing the carbon fiber precursor fibers through one or more draw and wash baths, resulting in drawn carbon fiber precursor fibers that are substantially free of solvent;
- and
- d) oxidizing the drawn carbon fiber precursor fibers of step c) to form stabilized carbon fiber precursor fibers and then carbonizing the stabilized carbon fiber precursor fiber thereby producing carbon fibers;
- wherein at least one salt of an organic cation containing a C═N imine group is added to the polymer solution in step a) and/or to the coagulation bath in step b);
- wherein preparing the polymer solution comprises polymerizing acrylonitrile with one or more co-monomer(s) in a medium in which the resulting PAN polymer is soluble to form a solution, and adding the salt of an organic cation containing a C═N imine group to the solution to form the polymer solution.
4 more elements
A process for producing carbon fibers, the process comprising:
- a) preparing a molten polymer comprising polyacrylonitrile (PAN) polymer and at least one salt of an organic cation containing a C═N imine group;
- b) spinning the molten polymer prepared in step (b) using a spinneret;
- thereby forming carbon fiber precursor fibers;
- c) drawing the carbon fiber precursor fibers through one or more draw and wash baths, resulting in drawn carbon fiber precursor fibers that are substantially free of solvent;
- and d) oxidizing the drawn carbon fiber precursor fibers of step (c) to form stabilized carbon fiber precursor fibers and then carbonizing the stabilized carbon fiber precursor fiber, thereby producing carbon fibers, wherein step (a) comprises polymerizing acrylonitrile with one or more co-monomer(s) in a medium in which the resulting PAN polymer is sparingly soluble or non-soluble to form a mixture, adding the at least one salt of an organic cation containing a C═N imine group to the mixture, isolating the resulting PAN polymer, and heating the PAN polymer until it is in a molten state.
2 more elements
Dependencies are inferred from the claim text.