| 摘要 |
<p>A process for the manufacture of a heat-curable mixture which is preferably solid at room temperature and forms thermoset materials upon curing, for example a reactive hot-melt adhesive, comprises (A) the preparation of a first premixture (I) by directly introducing (a) a meltable solid resin, and at least one of the following components: (b) a liquid resin, (c) a flexibiliser, (d) an adhesion promoter, (e) a plasticiser, of which at least one is liquid, into a mixing zone, in which the components are melted; (B) the preparation of a second premixture (II) by directly mixing a heat-activatable hardener and one of the following: a thixotropic agent, a hardening accelerator, additives lending electric conductivity and fillers; (C) introducing the melt into an extruding zone, (D) introducing the powdered premixture (II) into the extruding zone downstream of the introduction of the melt, which premixture has a temperature below the hardening temperature and is introduced in such an amount that the content of premixture (II) in the final product is from 10 to 50, preferably 20 to 35% by weight, avoiding air inclusions in the melt and in the extruded material. An installation for carrying out the above process having a special extruder inlet chamber for the melt is likewise described. <IMAGE></p> |
