Whitford Corporation

Whitford Plastics Limited

Andrew J Melville

David J Topping

David P Willis

Leonard W Harvey

Michael Coates

Julie K Wright

Joel Ginies

Joel Gines

Robert Iain Whitlow

A method for applying an additive, e.g. a fluoropolymer, to cellulose. The method comprises a number of steps. First, solid cellulose, a solvent capable of dissolving cellulose, e.g. NMMO and a dispersion of the additive are brought into contact with each other. The additive is allowed to diffuse into the dissolved cellulose, which is possible as a result of the dissolution of the surface layer of the solid cellulose. The solubility of cellulose in the solvent is then reduced, whereby the additive that has diffused into the dissolved cellulose is incorporated into the resulting solid cellulose. A method for applying a fluoropolymer to cellulose as a surface coat is also described. Flexible bearing components comprising a mat of cellulose fibers and a fluoropolymer which may be made by the methods described.

Bearing components and processes for depositing additives, especially fluoropolymers, on cellulose

A method for the preparation of a modified fluoropolymer powdered material is disclosed. A suspension of solid fluoropolymer particles together with PTFE particles in an aqueous carrier, is frozen and the frozen carrier is then removed by sublimation at sub-atmospheric pressure to produce a dry powder of modified fluoropolymer particles.

Method for the preparation of fluoropolymer powdered materials

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Cheshire, United Kingdom

Andrew J Melville