PENTAERYTHRITOL ESTERS OF DISPROPORTIONATED TALL OIL ROSIN
UDC 665.947.2:665.947.3:665.944.824.5
Abstract
In order to obtain high-quality pentaerythritol rosin esters (with a color on the Gardner scale of no more than 3 and a softening point of no less than 101 °C), which are mainly used as adhesives in road marking compositions, the possibility of using disproportionated tall oil rosin as a source of resin acids with Gardner scale color no more than 2. The application of disproportionated rosin as a raw material made it possible to carry out the esterification in the temperature range of 260–270 °C which traditionally used in the synthesis of rosin esters without catalysts, technological additives, protective inert atmosphere and vacuum distillation. As a result, pentaerythritol rosin esters with high quality characteristics were obtained: color on the Gardner scale no more than 3, acid number no more than 10 mg KOH∙g-1, softening point no less than 103 °C. Similar esters of disproportionated tall oil rosin can also be obtained from other alcohols (methanol, ethanol, ethylene glycol and glycerol) and used as the basis for adhesive compositions and additives for various purposes, in which their color and its stability are important.
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