Composite polymeric articles formed from extruded sheets containing a liquid crystal polymer

摘要

A process for forming shaped three-dimensional products is described made from a composition containing at least one filler and an aromatic liquid crystal polymer. In one embodiment, the process includes forming a substrate such as a film, a sheet or a tube, through an extrusion process. Once the substrate is formed, the substrate is then heated and fed to a shaping process. The shaping process may comprise a thermal forming process or a blow molding process. In order to form the three-dimensional products, the aromatic liquid crystal polymer has a high heat of crystallization, a high melt temperature and/or a high melt viscosity.

主权项

1. An extruded sheet for use in a thermoformed product, wherein the sheet has a thickness of less than about 7 millimeters, the sheet being formed from a polymeric composition that comprises an aromatic liquid crystal polymer and filler particles, wherein the aromatic liquid crystal polymer contains repeating units derived from p-hydroxybenzoic acid, 4,4′-dihydroxybiphenyl, terephthalic acid, and 2-hydroxy-6-naphthalenecarboxylic acid, and wherein the polymer has a heat of crystallization of greater than about 3.3 J/g as determined in accordance with ISO Test No. 11357, a melting point of greater than about 300° C., and a melt viscosity of greater than about 50 Pa-s as determined in accordance with ASTM Test No. 1238-70 at a shear rate of 1000 s−1 and at a temperature that is 20° C. above the melting point.