Plastic and nonmetallic article shaping or treating: processes – Utilizing special inert gaseous atmosphere or flushing mold...
Patent
1984-02-27
1986-03-04
Czaja, Donald
Plastic and nonmetallic article shaping or treating: processes
Utilizing special inert gaseous atmosphere or flushing mold...
264176F, 264234, 264211, 528190, 524599, D01D 102, D01D 508, D01D 1002
Patent
active
045740666
ABSTRACT:
Melt extruded poly(6-oxy-2-naphthoate-4-oxybenzoate) shaped articles of relatively high strength and modulus are produced in a lesser period of time than commonly heretofore required in the prior art. The required polymer is capable of exhibiting an anisotropic melt phase and is formed through the reaction of 6-acetoxy-2-naphthoic acid and 4-acetoxybenzoic acid under a combination of melt polymerization conditions which surprisingly has been found to yield a shaped article following melt extrusion which may be heat strengthened in an unusually brief period of time (i.e. two hours or less). The polymerization is catalyzed by a potassium salt (e.g. potassium acetate), and the polymerization conditions require a relatively highly elevated final polymerization temperature. Substantially all of the acetic acid by-product is removed from the polymerization zone prior to concluding the polymerization under reduced pressure conditions. The process of the present invention through the reduction of the required heat strengthening time accordingly makes possible a substantial productivity increase for a given production facility.
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Charbonneau Larry F.
Gibbon John D.
Lawler Terry E.
Yoon Hyun-Nam
Celanese Corporation
Czaja Donald
Lorin Hubert C.
Stine Forrest D.
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