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Sprinkling powder, process for preparing a sprinkling powder, process for preparing a sprinkling fluoropolymer powder that cannot be transformed into fibrils Improvement in the process for sprinkling a substrate, Sprinkling fluoropolymer powder that cannot be transformed into fibrils and sprinkling fluoropolymer powder processable in fusion
Sprinkling powder, process for preparing a sprinkling powder, process for preparing a sprinkling fluoropolymer powder that cannot be transformed into fibrils Improvement in the process for sprinkling a substrate, Sprinkling fluoropolymer powder that cannot be transformed into fibrils and sprinkling fluoropolymer powder processable in fusion
"ASPERSIBLE POWDER, PROCESSES FOR THE PREPARATION OF AN ASPERSIBLE POWDER, PROCESS FOR THE PREPARATION OF A NON-TRANSFORMABLE FLUOROPOLYMER PERSPECTIBLE FLUOROPOLYMER POWDER, PERFECTING THE PROCESS FOR THE SPRAYING OF A SUBSTRATE PURPLE, SUFFERING FLUOROPOUS POWDER ASPERSIBLE FLUOROPOLYMER PROCESSABLE IN FUSION ". In a first embodiment, the present invention features a sprinkling powder comprising friable granules of agglomerated primary particles of non-fibrillable fluoropolymer and at least one other component, the powder having a nominal density of at least 20 g / 100 cc and an average particle size of 5 to 100 micrometers. The sprayable powder is preferably devoid of water-immiscible liquid, and more preferably devoid of halocarbon liquid. Other components include inorganic substances, pigments, and high temperature resistant polymer binders. In another embodiment, the invention features a sprayable powder comprising friable granules of primary particles agglomerated from a first fluoropolymer that cannot be transformed into fibrils and at least one other component of fluoropolymer that cannot be transformed into fibrils. The invention further presents a process for preparing the sprayable powder by spray-drying a liquid dispersion of primary fluoropolymer particles which cannot be transformed into fibrils and at least one other component to obtain friable granules. The dispersion is preferably free of water-immiscible liquid, and more preferably free of halocarbon liquid. In a preferred embodiment, the process includes preparing the sprinkling powder of the non-fibrillable fluoropolymer and, optionally, at least one other component, and densifying the granules of the agglomerated primary particles that result from spray drying. Densification can be carried out through mechanical compaction or by placing the granules in contact with a heated gas to form a fluidized bed. Optional crushing and heat treatment steps can be employed to obtain a desired nominal density and particle size for specific applications.
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