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AssigneeCommonwealth Scientific and Industrial Research Organisation
InventorsEzio Rizzardo, Gordon F. Meijs, San H. Thang
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A process for the production of polymers by free radical polymerization, characterized in that there is added to the polymerization system one or more compounds of the general formula (A). ##STR1## where R.sup.1 is hydrogen or a group capable activating the vinylic carbon towards free radical addition; Y is OR.sup.2 or CH.sub.2 X(R.sup.2).sub.n where R.sup.2 is an optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, or optionally substituted saturated, unsaturated or aromatic, aromatic carbocyclic or heterocyclic ring; X is an element other than carbon selected from Groups IV, V, VI or VII of the Periodic Table or a group consisting of an element selected from Groups IV, V, or VI to which is attached one or more oxygen atoms; and n is a number from 0 to 3, such that the valency of the group X is satisfied and, when n is greater than 1, the groups represented by R.sup.2 may be identical or different.
An improved process for the production of polymers or oligomers of controllably reduced molecular weight by the free radical polymerization of monomers in the presence of an initiator and a chain transfer agent which is present in an effective amount to control the molecular weight thereof;
An improved process for the production of polymers or oligomers of controlled molecular weight by the free radical polymerization of monomers in the presence of an initiator and a chain transfer agent which is present in an effective amount to control the molecular weight thereof;
An improved process for the production of polymers or oligomers of controlled molecular weight by the free radical polymerization of monomers in the presence of an initiator and a chain transfer agent which is present in an effective amount to control the molecular weight thereof;
An improved process for the production of polymers or oligomers of controlled molecular weight by the free radical polymerization of monomers in the presence of an initiator and a chain transfer agent which is present in an effective amount to control the molecular weight thereof;
Dependencies are inferred from the claim text.