| 摘要 |
<p>This invention relates to a block copolymer of polydiorganosiloxane and thiuram disulphide of formula : <IMAGE> prepared by reaction of the appropriate alpha , omega -(amino)diorganopolysiloxane with CS2 in the presence of a tertiary amine and an oxidising agent such as I2. Use of the copolymer of formula (I) as a "polyiniferter", that is to say as a free radical initiator, transfer agent and chain blocking agent during the radical polymerisation of vinyl monomers such as acrylate and styrene monomers, with the objective of obtaining a polydiorganosiloxane/polyvinyl block copolymer.</p> |
