26 results about "Paraphenylene diamine" patented technology

Para-Phenylenediamine (PPD), also known as paraphenylenediamine, p-phenylenediamine or 1, 4 diaminobenzene, is an aromatic amine with many industrial and cosmetic applications. The chemical is a common ingredient in permanent hair dye products, as well as dyes for fabrics, fur and dark makeup.