Abstract
Polychloroprene is an unsaturated chlorine-containing polymer and therefore it does not appear at first sight to have reactive positions. Nevertheless it can be proved to react with isocyanates. Although the chemistry of the reaction has not yet been fully explained, it is possible to determine an isocyanate equivalent weight. Recently a polychloroprene modification which was developed specifically for coating purposes, and which has been attracting more and more attention owing to its special properties, became commercially available under the name Plastifix PC®. This polychloroprene modification is crosslinked exclusively with polyisocyanate (e.g., Desmodur L). Used in this way, the product has already been applied to various practical purposes with favorable results. These applications and the properties of the polychloroprene have already been described elsewhere. The contents of that publication can be briefly summarized as follows: The polymer, which is supplied in the form of granules, is dissolved in solvents like any other resin for surface coating materials—preferably in a mixture of aromatics and esters. After the solution has been pigmented with inert carbon black, the composition is ground with normal grinding equipment. In general an antioxidant, usually an aromatic amine, is added as well. The polyisocyanate is added shortly before processing, though, even after it has been incorporated, the composition generally has a potlife of at least three days. Finishes applied with a brush, roller, or spray dry very fast and adhere very well. They are highly extensible and have long-lasting resistance to water, aqueous solutions of inorganic chemicals, and to petroleum, mineral oils, aliphatic hydrocarbons, and alcohol.
Adsorption of Sodium Hexadecyl Sulfate and Triton X from Binary Aqueous Solutions at Thermally Graphitized Carbon Black
