Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Noninterengaged fiber-containing paper-free web or sheet...
Patent
1984-11-01
1986-05-06
Van Balen, William J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Noninterengaged fiber-containing paper-free web or sheet...
128 92C, 264280, 26433117, 264348, 428364, 526352, 528481, 528950, B32B 2732
Patent
active
045871639
ABSTRACT:
An isotropic semicrystalline morphology of ultra-high-molecular-weight polyethylene and a method of making it. An original powder stock or a partially fused, melt-crystallized stock having a granular memory, is heated to a temperature at which the stock fuses completely to form a homogeneous melt which loses memory of the granular structure of the original stock. The resultant melt is cooled to ambient temperatures under compression to provide a novel homogeneous isotropic semicrystalline morphology. An anisotropic morphology of ultra-high-molecular-weight polyethylene may then be made by solid-state deforming that semicrystalline morphology at a temperature near but below its crystalline melting point at a deformation ratio of about 5 to 8.
REFERENCES:
patent: 4055862 (1977-11-01), Farling
patent: 4116892 (1978-09-01), Schwarz
patent: 4164531 (1979-08-01), Shiraki et al.
patent: 4489033 (1984-12-01), Uda et al.
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