process for the production of chlorothalonil having suitable crystallographic texture

摘要

PCT No. PCT/EP86/00218 Sec. 371 Date Dec. 17, 1986 Sec. 102(e) Date Dec. 17, 1986 PCT Filed Apr. 15, 1986 PCT Pub. No. WO86/06066 PCT Pub. Date Oct. 23, 1986.Process for the production of 2,4,5,6-tetrachloroisophtalonitrile, with formula (I), having a crystallographic structure suited for producing fungicide compositions remaining stable throughout time and having a high biological activity, wherein a thermal and/or mechanical treatment is carried out on the non-suited crystallographic structure, both by gradually decreasing the temperature during the de-sublimation phase, subsequent to industrial synthesis, and by supplying thermal energy-in static or dynamic conditions-and/or mechanical energy to the industrial technical product having a nonsuited crystallographic structure eventually during the phase of preparation or of micronization of said product.