Process for producing a high purity cyclized polymer of isoprene

Details Process for producing a high purity cyclized polymer of isoprene Process for producing a high purity cyclized polymer of isoprene

1983-11-22

1985-04-02

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253593, C08F 848

Patent

active

045088772

ABSTRACT:
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 Cl.sub.3-n H.sub.n CCOOH (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.

REFERENCES:
patent: 2661340 (1953-12-01), Van Veerson
patent: 3245974 (1966-04-01), Angelo

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