| 摘要 |
<p>The present invention is directed to a process for the production of agglomerates of a blend of a sterically hindered phenol antioxidant and an acid neutralizer such that the agglomerates have a balanced hardness to resist abrasion during conveyance yet being readily dispersed in a host plastic. Such agglomerates are achieved through the use of a processing aid consisting of an alcohol of the formula ROH wherein R is an alkyl group of 1 to 8 carbon atoms, either alone or having up to 80% by volume of a cosolvent selected from the group consisting of methylene chloride, chloroform, toluene, acetone, methylethylketone, xylene, cyclohexane, styrene, methylcyclohexane, and hexane. The cosolvent processing aid has at least 1 gram of antioxidant dissolved therein per 100 mL of solvent. The processing aids are used to form a paste of a mixture of antioxidant and an acid neutralizer. The resulting paste is then subjected to agglomeration and the resulting agglomerates are thereafter dried. Through the controlled use of alcohol in the processing aid there is achieved a control on the hardness of the resulting agglomerates which is inverse to the amount of alcohol employed in the system.</p> |
