Plastic and nonmetallic article shaping or treating: processes – Utilizing special inert gaseous atmosphere or flushing mold...
Patent
1988-08-25
1990-06-19
Lorin, Hubert C.
Plastic and nonmetallic article shaping or treating: processes
Utilizing special inert gaseous atmosphere or flushing mold...
264 292, 264 87, 26417713, 26417717, 26417719, 264182, 264206, 2642106, 2642107, 2642108, 264211, 26421115, 26421117, D01D 510, D01F 618, D01F 922
Patent
active
049351800
ABSTRACT:
An acrylic multifilamentary material possessing an internal structure which is particularly suited for thermal conversion to high strength carbon fibers is formed via a specifically defined combination of processing conditions. The acrylic polymer while in substantially homogeneous admixture with appropriate concentrations (as defined) of acetonitrile and water is melt extruded and is drawn at a relatively low draw ratio which is substantially less than the maximum draw ratio achievable. This fibrous material which is capable of readily undergoing drawing is passed through a heat treatment zone wherein the evolution of residual acetonitrile and water takes place. The resulting fibrous material following such heat treatment is subjected to additional drawing to accomplish further orientation and internal structure modification and to produce a fibrous material of the appropriate denier for carbon fiber production. One accordingly is provided a reliable route to form a fibrous acrylic precursor for carbon fiber production without the necessity to employ the solution-spinning routes commonly utilized in the prior art for precursor formation. One can now eliminate the utilization and handling of large amounts of solvent as has heretofore been necessary when forming an acrylic carbon fiber precursor. Also, acrylic fiber precursors possessing a wide variety of cross-sectional configurations and a highly uniform internal structure now are made possible which can be thermally converted into carbon fibers of a similar cross-sectional configuration which are substantially void free when examined in cross section at a magnification of 2,000X.
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Daumit Gene P.
Ko Yoon S.
Slater Christopher R.
Venner Jozef G.
Young Chi C.
BASF - Aktiengesellschaft
Lorin Hubert C.
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