Method for making a thermoplastic stock shape

Details Method for making a thermoplastic stock shape Method for making a thermoplastic stock shape

1989-10-23

1993-06-15

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264119, 264120, 264122, 264126, 264323, 26433121, B29C 6704

Patent

active

052195023

ABSTRACT:
A method for making stock shapes from a composition which includes a liquid crystal polymer having a high crystallization temperature, the method including: (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.

REFERENCES:
patent: 3662052 (1972-05-01), Nowak et al.
patent: 4820466 (1989-04-01), Zachariades
patent: 4879081 (1989-11-01), Keep

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