| 摘要 |
<p>Compositions for coating onto polymeric surfaces such as photographic film supports to reduce static include alkali metal salts of alkylphosphoric acid esters, arylphosphoric acid esters or aralkylphosphoric acid esters. The alkyl chains of the phosphoric acid esters contain from about eight to 22 carbon atoms and the alkali metal has an atomic weight of at least 23, the preferred alkali metals being potassium, rubidium and cesium. The salts are applied to the polymeric surfaces from aqueous or organic solvent solutions which may contain a binder such as a polyvinyl acetal, cellulose esters and ethers, etc. The phosphoric acid salts have distinctive properties as antistatic agents compared to lower alkyl phosphate salts such as alkali metal amylphosphates; for example, they impart good static protection at low humidity and do not transfer to adjacent film surfaces so to interfere with coating of photographic emulsions thereon. They also function as film lubricants.</p> |
