Celanese Gmbh

Fiber Industries, Inc.

Arnold J Cobb

Sintered bauxite particles having defined physical and chemical properties are disclosed as being surprisingly eminently suitable as filtration media for molten polymer, such as polyester polymer. Broadly, the particles have a roundness of at least 0.8, and an API standard mesh size of at least 12; in addition, such particles inherently contain significant amounts of ferric oxide. It is preferred that the sintered bauxite particles (i) be microcrystalline, and therefore sintered under critical conditions; (ii) exhibit high crush strength; (iii) be compaction and fracture resistant up to pressures of 6000 psi by defined permeability tests; and (iv) have an API standard mesh size not greater than 70. Also, the sintered particles may have a microporous internal structure and surface. Also disclosed is an improved annular melt-spinning pack, including a bed of sintered bauxite particles, and means for preventing the bed of free-flowing particles from being deformed during use of the pack.

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Florence, SC, United States of America

Arnold J Cobb