Stabilized halogen-containing polymer composition

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

Reexamination Certificate

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C524S094000, C524S110000, C524S393000, C524S399000, C524S434000, C524S569000, C524S330000, C252S397000, C252S400520, C252S404000, C252S405000, C252S406000, C252S407000

Reexamination Certificate

active

06897254

ABSTRACT:
Halogen-containing polymer compositions containing a heat stabilizer comprising a latent mercaptan, a zinc salt, and a free mercaptan as a separate entity are protected during processing by the degradation products of the latent (i.e., blocked) mercaptan. A free mercaptan is among those products. The separate free mercaptan (i.e., an alien free mercaptan) enhances the activity of the latent mercaptan in a synergistic manner.

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