Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Additional information on environmental fate and behaviour

Administrative data

additional information on environmental fate and behaviour
Type of information:
experimental study
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Reliable with restrictions.

Data source

Referenceopen allclose all

Reference Type:
Polymer Stabilization and Degradation (ACS Symosium Series 280)
Klemchuk, P.P. (Editor), Pospisil, J. (Author)
Bibliographic source:
CIBA-GEIGY Corporation, American Chemical Society, Washington, D.C.
Reference Type:
Antioxidant, antidegradant depletion in tire compounds
Ignatz-Hoover, F.
Bibliographic source:
Rubber & Plastics News (March 19, 2012)

Materials and methods

Principles of method if other than guideline:
no guideline followed
GLP compliance:
Type of study / information:
Mechanistic studies concerning the oxidation behaviour of paraphenylenediamines.

Test material

Constituent 1
Reference substance name:
Paraphenylenediamines, either linked to phenyl and alkyl groups (e.g. 7PPD) or to two alkyl groups (e.g. 77PD).
Paraphenylenediamines, either linked to phenyl and alkyl groups (e.g. 7PPD) or to two alkyl groups (e.g. 77PD).

Results and discussion

Applicant's summary and conclusion

Executive summary:

In mechanistic studies, the reaction of paraphenylenediamines with oxygene and ozone radicals was studied.

  • Reaction with oxygene: Formation of quinone-diimines followed by oxidation of the nitrogene forming N-oxides.
  • Quninone-diimines may also react to mono-quinoneimines which might further react to p-benzoquinone
  • Reaction with ozone: Addition of ozone to nitrogene with cleavage of the C-N structure forming N-oxides. Quinone-iminines and N-oxides are reactive species which might further react forming higher and more complex molecules.