Process for devulcanizing vulcanized fluoroelastomers, fluoroelastomers thereof and their use
AssigneeDott. Viola & Partners Chemical Research S.R.L.
InventorsAlessandro Cervellati, Gian Tommaso Viola
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Abstract
A process for devulcanizing fluoroelastomers having a fluorine content between 62% and 74% by weight vulcanized by ionic systems, preferably selected from bisphenol A and bisphenol AF, i.e. 2,2-bis(4-hydroxyphenyl)hexafluoropropane, the process including a step of heating the vulcanized fluoroelastomers in the presence of a hydrolysis composition having one or more chemical selected from water, water soluble alcohols, water soluble glycols and mixtures thereof, at a temperature from 350° C. to 430° C. Fluoroelastomers obtainable by this process and their use for the preparation of compounds and vulcanized compositions are also described.
Claims16
A process for devulcanizing vulcanized fluoroelastomers having a fluorine content between 64% and 73% by weight and vulcanized by ionic systems, said process comprising a step of:
- heating said vulcanized fluoroelastomers in presence of a hydrolysis composition, wherein said hydrolysis composition consists of one or more chemical selected from the group consisting of water, water soluble alcohols, water soluble glycols and mixtures thereof, at a temperature from 350° C. to 430° C.
Dependencies are inferred from the claim text.