Patent ID: 6129847
Filing Date: 2000-10-10
Classification: B29B,B29K,B29L,C08J,Y02W

Abstract:
A process for separately recovering the magnetic powder and the substrate material from finely chopped wastes of magnetic recording media, consisting of a polymeric substrate and a magnetic layer present thereon, in which finely divided magnetic powder is dispersed in crosslinked or uncrosslinked polymeric binder, whereinthe finely chopped waste of magnetic recording media is treated in a solution consisting ofa) the potassium salt of a polyunsaturated fatty acid, orb) a biodegradable cleaning agent comprising phosphates, surfactants and a complexing agent,and one or more organic solvents or water while being subjected to mechanical action, andthe magnetic powder removed is then separated from the substrate material by washing or sedimentation or in a magnetic separator.