摘要:
Disclosed is a protective transparent overcoat comprising a protective polymer and a surfactant compound having multiple non-end-group hydrogen bonding groups directly or indirectly bonded to the backbone chain of the surfactant compound. The coating enables simplified manufacturing of a thermal sublimation dye transfer donor of high quality.
摘要:
Disclosed is a protective transparent overcoat comprising a protective polymer and a surfactant compound having multiple non-end-group hydrogen bonding groups directly or indirectly bonded to the backbone chain of the surfactant compound. The coating enables simplified manufacturing of a thermal sublimation dye transfer donor of high quality.
摘要:
Salts of citric acid are separated from a fermentation broth by a two-step process utilizing an adsorbent comprising a water-insoluble, macroreticular gel, weakly basic, anionic exchange resin possessing tertiary amine functional groups or pyridine functional groups, said anionic exchange resin comprising a crosslinked acrylic or styrene resin matrix and a desorbent comprising water or dilute sulfuric acid. The pH of the feed, a fermentation broth, containing citric acid, is adjusted and maintained below the first ionization constant (pKa.sub.1) of citric acid to maintain selectivity in the first step wherein citric acid is adsorbed onto the adsorbent. Then, citric acid is converted to a salt by a reaction with an aqueous alkaline liquid solution and is eluted immediately at the void volume in the alkaline solution.