Plastic and nonmetallic article shaping or treating: processes – Treating shaped or solid article – By a temperature change
Patent
1978-01-30
1981-01-27
Lee, Lester L.
Plastic and nonmetallic article shaping or treating: processes
Treating shaped or solid article
By a temperature change
264 85, 264235, 264342R, 264342RE, 264346, 528191, 528193, B29C 2500
Patent
active
042475147
ABSTRACT:
Heat treatment of shaped articles, larger than films or fibers, formed from anisotropic-melt-forming polymers provides an increase of at least 25% in energy to break in flexure. In at least one direction of measurement the heat treated articles are characterized by a flexural break strength of at least 10,000 psi, maximum strain to break in flexure of at least 2% and a flexural modulus of at least 500,000 psi. In many instances the heat treated articles can be further characterized by a notched Izod impact strength of at least 2 foot-pounds per inch.
Since the heat-treated shaped articles have high levels of strength, stiffness and toughness, they are useful as replacements for some metals, e.g., brass.
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patent: 3888965 (1975-06-01), Kwolek
patent: 4118372 (1978-10-01), Schaefgen
E. I. Du Pont de Nemours and Company
Lee Lester L.
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