N-(1,3-Dimethylbutyl)-N

OECD SIDS
N-(1,3-DIMETHYLBUTYL)-N´-PHENYL-1,4-PHENYLENEDIAMINE
1.3 Physico-Chemical properties
Table 1
Summary of physico-chemical properties
Property Value Reference IUCLID
Substance type organic compound 1.1.1
Physical state brown solid substance 1.1.1
UV absorbance maximum
at 291 nm
at 350 nm
Mueller et al. 1988
John et al. 1983
Melting point 50 C Hawley 1977 2.1
Boiling point
at 1013 hPa
Density at 50 °C
Vapour pressure
at 25 °C
Octanol/water partition
coefficient (log Kow)
Water solubility
at 20 °C
at 50 °C
Solubility in organic solvents
ca. 370 °C
(calculated)
0.995 g/cm³
(measured)
6.85 10 -3 Pa
(calculated)
4.68
(calculated)
1 mg/l
ca. 1 mg/l (measured
OECD TG 105
modified)
Soluble in acetone,
ethyl acetate, methylene
chloride
Flash point 200 °C
(DIN 51758)
Auto flammability (ignition
temperature)
*Manufacturer data without proof
ca. 500 °C
(measured)
1.1.2
EPA 2003 2.2
Bayer AG 1997 2.3
Bayer AG 1994 2.4
Bayer AG 2003b 2.5
Monsanto 1992
Bayer AG 1997
2.6.1
Bayer AG 2003a* 2.6.1
Bayer AG 2003a* 2.7
Bayer AG 2003a* 2.8
Under the influence of light, 6PPD turns dark brown to blackish brown (Kempermann et al. 1991).
2 GENERAL INFORMATION ON EXPOSURE
2.1 Production Volumes and Use Pattern
In Germany 6PPD is manufactured in an industrial scale only at the Bayer AG Brunsbüttel plant. In
a continuously working closed system 4-aminodiphenylamine is reacted with an excess of methyl
isobutyl ketone (MIBK) to a Schiff´s base. This base is then hydrogenated catalytically. The excess
of MIBK is separated off. The hydrogenation by-products are purged with steam. Impurities are
removed by distillation under reduced pressure yielding 6PPD with a purity of > 98 % (Bayer
Polymers 2003).
There are no data available on the global production of 6PPD. However, the global production
capacity of 4-aminodiphenylamine (4-ADPA) was about 140,000 tonnes in 1995 (OECD SIDS
report 4-Aminodiphenylamine, CAS 101-54-2, agreed upon at SIAM 18 and 19). 4-ADPA is nearly
exclusively used for the manufacturing of antiozonants for the rubber industry. The total
antiozonants production amounted to 117,000 tonnes by approximately 20 producers in 1995, with
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