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US 2011/0256374 A1Published application
Composite article made by a process
AssigneeE. I. Du Pont de Nemours and Company
InventorsJ. David Booze, James E. Weishampel
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Abstract
Disclosed herein is a consolidated or densified composite article comprising polymer, particularly fluoropolymer, and carbon fiber.
Claims7
A process for making a consolidated composite article having a density, Dc, and comprising:
- (i) a polymer having a softening temperature and (ii) fibers, said process comprising:
- providing a matte, wherein said matte is a mixture comprising:
- from about 1 wt % to about 90 weight percent of said fibers;
- and from about 10 weight percent to about 90 weight percent particles of a polymer, said matte having a density, Dm, that is less than Dc;
- densifying said matte to a compressed density greater than 1.1 times Dm and less than 0.999 times Dc while at least a portion of said matte is at a temperature less than softening temperature of polymer, to provide a compressed matte;
- heating said compressed matte throughout to a temperature greater than said softening temperature at a density greater than 1.1 times Dm and less than 0.999 times Dc, to provide a preconsolidated matte;
- cooling at least a portion of said preconsolidated matte to a temperature less than said softening temperature, to provide a consolidated matte;
- stacking a plurality of said consolidated matte to provide an article having selected fiber orientation of adjacent and contacting mattes, or pluralities of mattes;
- compressing the height of said article and heating throughout to a temperature greater than said softening temperature, to provide a consolidated composite article;
- and
- cooling at least a portion of said consolidated composite article to a temperature less than said softening temperature.
8 more elements
Dependencies are inferred from the claim text.