Manufacturing Industry
Molecular markers could aid recycling. (Technology News: Recycling)
Plastics Technology, August, 1993 by Ogando, Joseph
One of the most fundamental recycling problems--the sorting of mixed plastics into pure waste steams--will soon have two new chemical solutions. Both Eastman Chemical Corp. of Kingsport, Tenn., and Germany's Bayer AG each have developed identification technology that allows sorting based on "marker" chemicals that are readily detectable and do not affect the resin's properties.
PVC, for example, already has a built-in marker--the chlorine atom, which fluoresces in response to x-rays. PET and polyolefins normally have no such "tag." Now Eastman has applied for a patent on a molecular marker that would be built onto PET's polymer backbone during resin manufacture. The company envisions other markers that would be added to polyolefins during color compounding....
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