Hydrocarbon dac-b resin prepared by polymerizing dac-b using two polymerization temperature ranges followed by hydrogenation
Abstract
Abstract THIS INVENTION PROVIDES A TWO-STAGE IMPROVED PROCESS FOR THE PREPARATION OF LIGHT-COLOR, HIGH SOFTENING POINT HYDROCARBON RESINS WHICH COMPRISES POLYMERIZING A MIXED HYDROCARBON FRACTION USING ALUMINUM CHLORIDE AS A CATALYST IN A TWO-STAGE REACTION SYSTEM. THE TEMPERATURE IN THE FIRST STAGE IS LOWER THAN THAT IN THE SECOND STAGE TO OBTAIN A SOLUTION CONTAINING A HIGH SOFTENING POINT CRUDE RESIN IN GOOD YIELDS. THE CHLORIDES ARE REMOVED FROM THE RESIN SOLUTION BY METHANOL EXTRACTION OR HIGH TEMPERATURE LIME TREATMENT FOLLOWED BY LOW PRESSURE HYDROGENATION AND/OR ALUMINA TREATMENT FOLLOWED BY HIGH PRESSURE-HIGH TEMPERATURE HYDROGENATION TO REMOVE COLOR AND REDUCE UNSATURATION AND THEREAFTER STRIPPING THE RESIN SOLUTION TO OBTAIN A LOW COLOR, COLOR STABLE, MELT STABLE, HIGH SOFTENING POINT HYDROCARBON RESIN IN GOOD YIELDS.
Inventors
- 👤 Hugh J Hagemeyer Jr
- 👤 Harold E Hogan
- 👤 Sam H Johnson Jr
Bibliographic Details
Claims Analysis
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