Process for producing a high purity cyclized polymer of isoprene

摘要

A process for producing cyclized isoprene polymers having a dispersion degree not higher than 2, which comprises living-polymerizing isoprene monomers using as initiator an organometal compound which is expressed by a general formula RM (where R is alkyl, aryl or aralkyl group and M is lithium, sodium or potassium atom), to obtain an isoprene polymer having a dispersion degree not larger than 1.1, which is close to a unit dispersion, and bringing the obtained polymer into contact with a catalyst composed of a boron trifluoride-ether complex and a carboxylic acid expressed by a general formula Cl3-nHnCCOOH (where n is an integer ranging from 0 to 3) under a mild condition. The cyclized polymer is very useful for negative resists in integrated circuits.