關於 N-isopropyl-N'-phenyl paraphenylenediamine (IPPD)

Polyisoprene may contain N-isopropyl-N'-phenyl paraphenylenediamine (IPPD) as an additive.

N-isopropyl-N'-phenyl paraphenylenediamine (IPPD) is mainly used as antioxidant/antiozonant in rubber manufacture.
Reference: http://orgs.dermis.net/content/e05eecdrg/e05news/e686/e702/index_ger.html

Polyisoprene is natural rubber
Reference: http://pslc.ws/macrog/isoprene.htm
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2008-11-06 14:21:10 補充：
You have read the two webpages, but you have failed to integrate the contents of the two webpages.

2008-11-06 14:21:17 補充：
The first webpage states that IPPD is used to as an antioxidant/antiozonat in rubber. Among the seven given substances, ONLY polyisoprene is RUBBER. Therefore, IPPD is used as an oxidant/antiozonant in polyisoprene rubber.

Furthermore, IPPD is an additive, but not used in making polyisoprene.

thx so much

i've read the 2 reference. It only mention that IPPD is an antioxidant used to make black rubber, but does not mention specifically that IPPD is used to make any of polyisoprene
polypropylene
polyester
PVC
polyurethane
acrylic
ethylene/ acrylic acid copolymer

2008-11-06 12:34:23 補充：
Is there any reference specifically mention IPPD is used to make any of the above?

thx a million