| 摘要 |
Emulsifiable polyethylene waxes are produced by a process which comprises oxidizing a nonemulsifiable polyethylene wax by intimately contacting all of the wax with an oxygen-containing gas (e.g. oxygen alone or air) in the presence of at least one aliphatic monocarboxylic acid. Oxidation is generally effected at 100-250 DEG C. at pressures of up to 70 kg./sq. cm. (gauge), and is preferably continued until the product has an acid number of from 4 to 25. Catalysts, e.g. organic peroxides such as di-t.-butyl peroxide, and stabilizers, e.g. sodium or potassium carbonate, may optionally be present. The initial polyethylenes generally have molecular weights of 250 to 6000, softening points of 88 DEG to 125 DEG C., acid numbers of substantially 0, and densities of 0.90 to 0.97. Monocarboxylic acids specified are acetic, propionic, butyric, isobutyric, valeric, caprylic, nonanoic, lauric, palmitic, stearic, nonadecanoic, acrylic, butenoic, sorbic and oleic acids. |
