Method for producing submicron polytetrafluoroethylene...

C - Chemistry – Metallurgy – 08 – J

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C08J 3/12 (2006.01) B29C 35/08 (2006.01) C08J 3/02 (2006.01) C08J 3/28 (2006.01) C08L 27/18 (2006.01)

Patent

CA 2514218

A method for treating polytetrafluoroethylene (PTFE) in its reactor latex form to produce a dry submicron PTFE powder that remains stable without rheology modifiers, surfactants, wetting agents, pH adjusters or other stabilizing additives. Reactor latex PTFE formed during an emulsion polymerization process can be irradiated, with an electron beam or gamma rays, during or after the polymerization to form a product where the dry submicron PTFE powder is free- flowing, tends not to self-agglomerate and tends not to dust into the air upon handling so that the PTFE is readily dispersible when placed in a desired application system or medium.

L'invention concerne un procédé de traitement de polytétrafluoroéthylène (PTFE) sous sa forme latex réacteur afin de produire une poudre sèche de PTFE submicronique qui reste stable sans addition de modificateurs de rhéologie, tensioactifs, agents mouillants, ajusteurs de pH ou autres additifs de stabilisation. Le PTFE sous forme latex réacteur formé au cours d'un procédé de polymérisation en émulsion peut être irradié, à l'aide d'un faisceau d'électrons ou de rayons gamma, pendant ou après la polymérisation afin de former un produit dans lequel la poudre sèche de PTFE submicronique à écoulement fluide, ne tend pas à s'auto-agglomérer et ne tend pas à dégager de la poussière dans l'air lors de la manipulation, de sorte que le PTFE peut être facilement dispersé lorsqu'il est placé dans un système d'application ou dans un milieu souhaité.

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