Recycling of cured polysulfide and/or polymercaptan...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 11/28 (2006.01)

Patent

CA 2224390

The invention concerns a process for recycling hardened or partially hardened polysulphide and/or polymercaptan compositions. Processing is carried out in a non-volatile liquid, with the addition of a depolymerization agent, preferably a sulphurous vulcanization accelerator known from rubber technology. The depolymerisate can be added in high proportions to the hardener component of two-component polysulphide and/or polymercaptan adhesives, sealants or coating materials without substantially modifying its hardening characteristics or properties concerning stability during storage.

L'invention concerne un procédé de recyclage de compositions à base de polysulfures et/ou de polymercaptans durcies ou partiellement durcies. Le traitement s'effectue dans un liquide non volatil, sous apport d'un agent de dépolymérisation, de préférence un accélérateur de vulcanisation contenant du soufre, connu dans la technologie du caoutchouc. Le dépolymérisat peut être ajouté dans des proportions élevées au constituant durcisseur de substances adhésives/d'étanchéité à base de polysulfures et/ou de polymercaptans à deux composants, sans que ses propriétés de stabilité au stockage ou ses caractéristiques de durcissement s'en trouvent sensiblement modifiées.

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