While composition in order aliphatic conjugate diene not to be included butyl, the peroxide hardenability compound null a.

摘要

This invention aliphatic conjugate diene is not included while composition, at the same time as under flowing back 60 minutes in boiling cyclohexane solid amount content of insoluble solution 15 weight % been under butyl, as at least contained one which includes the polymer peroxide hardenability compound the molding item and said butyl contains one which includes the polymer peroxide hardenability compound at least, the sealing material and the medical device, and the said butyl way it regards the production manner of the polymer.