FIELD: rubber industry. SUBSTANCE: cyclopolyisoprene is manufactured via partially destructive cyclization of polyisoprene, preferably cis-1,4- polyisoprene, in particular natural or synthetic isoprene rubber, carried out in organic solvent solution in presence of catalyst containing titanium tetrachloride and alkylaluminum dior sesquichloride wherein alkyl is linear or branched C1-C8-alkyl group at titanium tetrachloride/aluminum compound molar ratio between 10:1 and 1:10. Once cyclization is ended, solution is supplemented by at least one hydrocarbon-soluble proton-donor compound containing at least one functional group selected from hydroxy, amino, aldehyde, mercapto, or CH acid group at proton-donor compound/titanium tetrachloride molar ratio 0.1:1. Thus obtained cyclopolyisoprene has neutral reaction. EFFECT: improved film-forming properties. 2 cl, 2 tbl, 11 ex
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