Method for preparing an imidized polymer
AssigneeLanxess Elastomers B.V.
InventorsPatric Meessen, Johannes Hendrik Geesink
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Abstract
A process is provided for preparing an imidized polymer in a mixing or kneading device, by a reaction in the presence of an acid of a mixture containing a polymer having anhydride groups or derivatives thereof and an aromatic polyamine compound. A solid multifunctional viscosity modifier is also provided which includes a polymer having between 0.1 and 10 functional groups per 1000 C-atoms. The functional groups include aromatic amine based imide groups with a ratio of imide groups to the functional groups being more than 0.85.
Claims14
Process for preparing an imidized polymer which comprises reacting in a mixing or kneading device a mixture, comprising (i) an olefin copolymer comprising from 15 to 80 wt % of ethylene, from 20 to 85 wt % of a C3-C10 alpha-monoolefin, from 0 to 15 wt % of a polyene selected from non-conjugated dienes and trienes and from 0.1 to 10 anhydride groups or derivatives thereof per 1000 C-atoms, and (ii) an aromatic polyamine compound of which at least one of the amine groups is a primary amine, in the presence of between 1 and 4 mol % based on the amount of the polyamine of an acid.
A solid multifunctional viscosity modifier comprising a polymer comprising between 0.1 and 10 functional groups per 1000 C-atoms, wherein the functional groups comprising aromatic amine-based imide groups, and wherein the imide and functional groups are present in a ratio of the imide groups to the functional groups of more than 0.85.
Dependencies are inferred from the claim text.