| 摘要 |
<p>A method for the continuous manufacture of hydrocarbon resins starting from polymerizable insaturated hydrocarbons adapted to selectively obtain clear resins having well determined viscosities or softening points and to control the temperature of the polymerization reaction conducted in the presence of a Lewis acid as catalyst and recycling a fraction of the reaction mixture, due to the improvement comprising the steps of forming a close mixture of the catalyst and of the hydrocarbon fraction to be polymerized in a reactor, said mixture containing, by weight, from 0.05 to 0.8 part, and preferably from 0.1 to 0.4 part, of catalyst for 100 parts of hydrocarbons, diluting and dispersing said mixture homogeneously by means of, and/in, a portion of stream of the medium issuing from the reactor in the proportion of from 60 to 300 parts, by volume, of said stream, and preferably of from 80 to 140 parts, for one part, by volume, of the hydrocarbon fraction to be polymerized, said polymerization being, in addition, contingently carried out in the presence of water added in the proportion of from 0 to 2.2 moles per mole of catalyst, and drawing off the remaining portion of the medium issuing from the reactor so as to isolate the resin obtained therefrom, the temperature of the reaction medium being maintained constant through heat-exchange, between 30 DEG and 120 DEG C, and preferably between 40 DEG and 110 DEG C, for a dwell time of from 10 to 60 minutes, and preferably of from 20 to 40 minutes, in the reactor.</p> |
