Methods for preparing agglomerated pellets of...

C - Chemistry – Metallurgy – 08 – L

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C08L 3/00 (2006.01) C08J 3/12 (2006.01)

Patent

CA 2486271

PTFE pellets with good bulk density, homogeneity, and flowability properties may be obtained by: (1) wetting a PTFE powder with a solvent, to obtain a wetted PTFE powder; (2) forming the wetted PTFE powder into agglomerated pellets of PTFE; and (3) drying the agglomerated pellets of PTFE pellets, in which the drying of the agglomerated pellets of PTFE is carried out in a fluidized bed drier. The PTFE pellets so obtained may be used to prepare molded articles of PTFE.

L'invention concerne des granules en polytétrafluoroéthylène (PTFE) possédant de bonnes propriétés de poids volumétrique, d'homogénéité, et d'aptitude à l'écoulement qui peuvent être obtenues: (1) par mouillage d'une poudre PTFE avec un solvant, en vue d'obtenir une poudre PTFE mouillée; (2) par formage de la poudre PTFE mouillée en granules agglomérées de PTFE; et (3) par séchage des granules agglomérées de PTFE. Le séchage des granules agglomérés de PTFE est réalisé dans un sécheur à lit fluidisé. Les granules PTFE ainsi obtenues peuvent être utilisées en vue de préparer des articles moulés en PTFE.

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