Aqueous dispersion of fluoropolymers of varying particle size

Details Aqueous dispersion of fluoropolymers of varying particle size Aqueous dispersion of fluoropolymers of varying particle size

C - Chemistry, Metallurgy

08

J

C08J 3/05 (2006.01) C08J 3/00 (2006.01) C08L 27/12 (2006.01) C08L 27/18 (2006.01) C09D 127/18 (2006.01) D06M 15/256 (2006.01) D06M 15/353 (2006.01) D06N 3/04 (2006.01)

Patent

CA 2295147

The invention relates to aqueous dispersions of fluoropolymers obtained by emulsion polymerisation, containing at least one fluoropolymer A) with a mean particle size (number average) of at least 200 mn and at least one fluoropolymer B) with a mean particle size (number average) of no more than 100 nm. One of the components A) and B) is a thermoplastic material and the other component cannot be processed from its melted form. In the dispersion as a whole, numeric distribution of particle diameter is non-unimodal. Said dispersions are suitable for soaking, impregnating or coating surfaces, for example fibres or flat structures made of fibres or porous substances, in particular for coating fibre glass tissues, and for the formulation of metal coating systems.

L'invention concerne des dispersions aqueuses de polymères fluorés obtenus par polymérisation en émulsion, qui contiennent au moins un polymère fluoré A) de taille de particule moyenne (moyenne numérique) d'au moins 200 nm, et au moins un polymère fluoré B) de taille de particule moyenne (moyenne numérique) de 100 nm au plus. L'un des constituants A) et B) est un thermoplaste et l'autre constituant ne peut être traité à partir de la matière fondue. La dispersion dans son ensemble présente une distribution numérique non unimodale du diamètre des particules. On utilise ces dispersions aqueuses pour le trempage, l'imprégnation ou l'enduction de surfaces, par exemple de fibres ou de structures de surface en fibres ou étoffes poreuses, en particulier pour l'enduction de tissus de verre, ainsi que pour la formulation de systèmes de métallisation.

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