Branched polymers
AssigneeThe University of Liverpool
InventorsSteve Rannard, Pierre Chambon, Savannah Cassin
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Abstract
A method of preparing a branched polymer comprises the free radical polymerisation of a multivinyl monomer in the presence of a chain transfer agent, using a source of radicals, wherein the extent of propagation is controlled relative to the extent of chain transfer to prevent gelation of the polymer. The average length of each vinyl polymer chain within the product is short.
Claims27
A method of preparing a branched polymer comprising the free radical polymerisation of one or more multivinyl monomers in the presence of one or more chain transfer agents, using a source of radicals, wherein the extent of propagation is controlled relative to the extent of chain transfer to prevent gelation of the polymer.
A method of preparing a branched polymer comprising the free radical polymerisation of a multivinyl monomer in the presence of a chain transfer agent, using a source of radicals, wherein propagation is controlled relative to chain transfer to achieve a polymer having a multiplicity of vinyl polymer chain segments wherein the average vinyl polymer chain contains between 1 and 3 multivinyl monomer residues.
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A branched polymer product comprising multivinyl monomer residues and chain transfer residues, wherein the branched polymer product comprises a multiplicity of vinyl polymer chain segments having an average length of between 1 and 3 multivinyl monomer residues.
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A branched polymer product comprising multivinyl monomer residues, and chain transfer residues wherein the multivinyl monomer residues comprise less than 20 mol % unreacted double bond functionality.
A branched polymer product comprising multivinyl monomer residues and chain transfer residues, comprising on average 0.5 to 6 chain transfer agent residues per divinyl monomer residue.
A branched polymer product comprising multivinyl monomer residues and chain transfer residues, wherein each vinyl residue of the multivinyl monomer is directly vinyl polymerised to on average 0.1 to 1.5 other multivinyl monomer residues.
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Dependencies are inferred from the claim text.