Copolymers comprising three segments of different ion density, processes for preparing them and use thereof
AssigneeBYK-Chemie GmbH
InventorBernd Gobelt
Life of this patent
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Abstract
The invention relates to copolymers comprising three segments of different ion density, the fraction of the ionic monomers in each segment being from 1 to 100 mol %, the second and third segment containing ethylenically unsaturated monomers of the respectively preceding segment, and the copolymers being preparable by means of a monofunctional initiator by way of NMP or RAFT. The invention further relates to a process for preparing copolymers and to their use as dispersants.
Claims23
A copolymer comprising three segments of different ion density, the fraction of the ionic monomers in each segment being from 1 to 100 mol %, the second and third segment containing ethylenically unsaturated monomers of the respective preceding segment, and the copolymers being the result of an NMP or RAFT polymerization with a monofunctional initiator, wherein
- the polymerization of the first segment takes place up to a degree of conversion of 10 to 95 mol % of the monomer or monomer mixture employed,
- the polymerization of the second segment onto the first segment takes place with inclusion into the second segment of the unreacted monomers of the first segment and with inclusion of a monomer or monomer mixture which differs from the monomer or monomer mixture of the first segment at least in the amount of ionic monomers or ionic monomer precursors employed, the polymerization of the second segment taking place up to a degree of conversion of 10 to 95 mol % of the monomers available for reaction, and
- the polymerization of the third segment onto the second segment takes place with inclusion into the third segment of the unreacted monomers of the second segment and, where appropriate, of unreacted monomers of the first segment and with inclusion of a monomer or monomer mixture which differs from the monomer or monomer mixture of the second segment at least in the amount of ionic monomers or ionic monomer precursors employed,
- and the ionic monomer precursors, where used, are converted wholly or partly into ionic monomers.
A process for preparing a copolymers comprising three segments of different ion density, the fraction of the ionic monomers in each segment being from 1 to 100 mol %, each segment containing at least one non-ionic monomer and at least one ionic monomer, the second and third segment containing monomers of the respectively preceding segment, and the copolymers being prepared using a monofunctional initiator and an NMP or RAFT polymerization, wherein
- the polymerization of the first segment takes place up to a degree of conversion of 10 to 95 mol % of the monomer or monomer mixture employed,
- the polymerization of the second segment onto the first segment takes place with inclusion into the second segment of the unreacted monomers of the first segment and with inclusion of a monomer or monomer mixture which differs from the monomer or monomer mixture of the first segment at least in the amount of ionic monomers or ionic monomer precursors employed, the polymerization of the second segment taking place up to a degree of conversion of 10 to 95 mol % of the monomers available for reaction, and
- the polymerization of the third segment onto the second segment takes place with inclusion into the third segment of the unreacted monomers of the second segment and, where appropriate, first segment and with inclusion of a monomer or monomer mixture which differs from the monomer or monomer mixture of the second segment at least in the amount of ionic monomers or ionic monomer precursors employed,
- and the ionic monomer precursors, where used, are converted wholly or partly into ionic monomers.
Dependencies are inferred from the claim text.