Thermoplastic stock shape and method for making the same

Details Thermoplastic stock shape and method for making the same Thermoplastic stock shape and method for making the same

1988-02-29

1990-01-02

Thomas, Alexander S.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

428 1, B32B 2736

Patent

active

048912611

ABSTRACT:
A method for making stock shapes from a composition which includes a liquid crystal polymer having a high crystallization temperature, said method comprising: (a) densifying the composition into a compact; and (b) processing the compact at one or more temperatures below the crystallization temperature using a moderate to high strain rate. For the liquid crystal polymer consisting essentially of p, p' biphenol, p-hydroxybenzoic acid and terephthalic acid monomers and sold under the trademark "Xydar.RTM.", a preferred embodiment includes heating the compact to one or more temperatures between about 400.degree.-650.degree. F.; and extruding the heated compact in the solid state through a uniform flow-type die at a strain rate of at least about 2 sec.sup.-1. Thermoplastic stock shapes weighing about four or more pounds and having thicknesses in all dimensions greater than the maximum thickness obtainable through injection molding are also disclosed.

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