Process for manufacturing multisequence star or network polycondensates by di- or multi-aldehyde coupling, and polycondensates obtained
AssigneeElf Atochem S.A.
InventorYves Gnanou
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Abstract
A novel process for coupling living polymers containing terminal (meth)acrylic units, which enables an increase in molecular weight and/or a defined multi-sequencing and/or a star structure with a defined number of branches, is disclosed. The disclosed process comprises the steps of: (i) anionic polymerization using an initiator system consisting of a bi-functional initiator and a ligand to obtain a living polymer containing living terminal (meth)acrylics units; (ii) reacting it with an aldehyde compound of formula R--(CHO).sub.r in which r>2; and (iii) recovering the final polycondensate by means known per se.
Claims49
A process for coupling a living polymer comprising living terminal (meth)acrylic units, which process comprises the steps of:
- (i) anionically polymerizing with an initiator system having a bi-functional initiator and a ligand to obtain a living polymer comprising living terminal (meth)acrylic units;
- (ii) reacting the living polymer with an aldehyde compound of formula:
- R--(CHO).sub.r
- in which r>2;
- R is an alkyl, cycloalkyl, aryl, or aralkyl group having from 2 to 24 carbon atoms, unsubstituted or substituted by at least one substituent comprising a C.sub.1-6 alkoxy or di(C.sub.1-6 alkyl)amino, halogen, or trifluoromethyl;
- and
- (iii) recovering the final polycondensate.
The process according to claim 11, wherein A is a vinylaromatic monomer and B is a methacrylate monomer.
Dependencies are inferred from the claim text.