| 摘要 |
<p>Grinding wheels are manufactured by adding a catalyst, inert or reactive additives and abrasives to an unreacted mixture comprising at least one unsatd. polyester and one other olefinically unsatd. cpd., shaping the resulting mass into the grinding wheel and curing the wheel by copolymerisation. Suitable reactive additives are polyisocyanates, polystyrene and/or trialkylcyanurate, and cumene hydroperoxide catalyst.</p> |
