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84 results about "P-Phenylenediamine" patented technology

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P-Phenylenediamine (PPD) is an organic compound with the formula C₆H₄(NH₂)₂. This derivative of aniline is a white solid, but samples can darken due to air oxidation. It is mainly used as a component of engineering polymers and composites like kevlar. It is also an ingredient in hair dyes and is occasionally used as a substitute for henna.