Process for surface treatment of N-alkyl-N'phenyl-p-phenylenediamine
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United States of America Patent
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Nov 26, 1991
Issued Date -
N/A
app pub date -
Dec 7, 1989
filing date -
May 11, 1984
priority date (Note) -
Expired
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Abstract
N-Alkyl-N'-phenyl-p-phenylenediamine particles, which are not easily broken during transportation or in a hopper and can be easily automatically metered, are prepared by a surface treating process wherein granulated N-alkyl-N'-phenyl-p-phenylenediamine particles are charged in a rotatable vessel and the vessel is then rotated at a temperature lower than the melting point of the N-alkyl-N'-phenyl-p-phenylenediamine, to cause the N-alkyl-N'-phenyl-p-phenylenediamine particles to freely flow.
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