Methods for preparing agglomerated pellets of polytetrafluoroethylene and molded articles and the agglomerated pellets of polytetrafluoroethylene and molded articles prepared thereby
AssigneeAsahi Glass Fluoropolymers USA, INC.
InventorsPamela J. Baron, Gary Eckrote, Tonya James, Ronald Partridge, Timothy C. Duzick
Life of this patent
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Abstract
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.
Claims52
A method for preparing agglomerated pellets of PTFE, said method comprising:
- (1) wetting a PTFE powder with a solvent, to obtain a wetted PTFE powder;
- (2) forming said wetted PTFE powder into agglomerated pellets of PTFE;
- and
- (3) drying said agglomerated pellets of PTFE,
- wherein said drying of said agglomerated pellets of PTFE is carried out in a fluidized bed drier.
Agglomerated pellets of PTFE, prepared by a process comprising:
- (1) wetting a PTFE powder with a solvent system, to obtain a wetted PTFE powder;
- (2) forming said wetted PTFE powder into agglomerated pellets of PTFE;
- and
- (3) drying said agglomerated pellets of PTFE,
- wherein said drying said agglomerated pellets of PTFE is carried out in a fluidized bed drier.
A method for preparing a molded article of PTFE, said method comprising:
- (1) wetting a PTFE powder with a solvent, to obtain a wetted PTFE powder;
- (2) forming said wetted PTFE powder into agglomerated pellets of PTFE;
- (3) drying said agglomerated pellets of PTFE, to obtain dried agglomerated pellets of PTFE;
- and
- (4) molding said dried agglomerated pellets of PTFE, to obtain a molded article, wherein said drying of said agglomerated pellets of PTFE is carried out in a fluidized bed drier.
A molded PTFE article, prepared by a process comprising:
- (1) wetting a PTFE powder with a solvent, to obtain a wetted PTFE powder;
- (2) forming said wetted PTFE powder into agglomerated pellets of PTFE;
- and
- (3) drying said agglomerated pellets of PTFE,
- wherein said drying said agglomerated pellets of PTFE is carried out in a fluidized bed drier.
Dependencies are inferred from the claim text.