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- noun chemistry A
polymerformed by ring-opening polymerization, originally developed in the 1950s as an alternativeto a similar patentedpolymer.
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In finalizing the ruling on imports of nylon 6, or polycaprolactam, from the U.S., the EU, Russia and Taiwan, China hit the U.S. with the highest duty for the material, which is used to make goods ranging from toothbrushes to gun frames to chiffon.