Preparation of polyisoprene having high content of 1,2- and 3,4- structural units by anionic polymerization

摘要

Polyisoprenes having a high content of 1,2- and 3,4-structural units, a process for their preparation, and their use.PP The previous processes for the preparation of polyisoprene having a high content of 1,2- and 3,4-structural units were still unsatisfactory in terms of the cocatalyst employed.PPThe use of ethylene glycol dialkyl ethers of the formulaPPR.sub.1 --O--CH.sub. 2 --CH.sub.2 --O--R.sub.2PPin which R.sub.1 and R.sub.2 are alkyl groups having different numbers of C atoms, from the group consisting of methyl, ethyl, n- and isopropyl and n-, iso-, sec.- and tert.-butyl, has, in particular, the advantage that the "living polymers" formed during the anionic polymerization are not damaged.P PThe production of tires and damping elements using these polyisoprenes.