Bearing components and processes for depositing additives,...

C - Chemistry – Metallurgy – 08 – J

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C08J 7/04 (2006.01) C08J 5/04 (2006.01) C08J 5/16 (2006.01) F16C 33/18 (2006.01)

Patent

CA 2677719

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 fibres and a fluoropolymer which may be made by the methods described.

L'invention concerne un procédé d'application d'un additif, tel qu'un fluoropolymère, sur de la cellulose. Ce procédé comprend plusieurs étapes. Premièrement, de la cellulose solide, un solvant pouvant dissoudre la cellulose, tel que du NMMO, et une dispersion de l'additif sont mis en contact les uns avec les autres. On laisse l'additif se diffuser dans la cellulose dissoute, cette diffusion étant possible après la dissolution de la couche superficielle de la cellulose solide. Ensuite, la solubilité de la cellulose dans le solvant est réduite, l'additif diffusé dans la cellulose dissoute étant alors incorporé dans la cellulose solide résultante. L'invention concerne également un procédé destiné à appliquer un fluoropolymère sur de la cellulose en tant que revêtement de surface. L'invention se rapporte en outre à des composants pour paliers souples comprenant un mat de fibres de cellulose et un fluoropolymère, et pouvant être fabriqués au moyen des procédés susmentionnés.

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