Dispersants with multiple aromatic imide anchor groups
AssigneeLubrizol Advanced Materials, Inc.
InventorsAndrew J. Shooter, Dean Thetford, Stuart N Richards, Robert A. Jennings
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Abstract
A polyurethane dispersant is described that comprises a reaction product of a polyisocyanate with a) a component supplying a anchoring imide group wherein the carbonyl groups of the imide are bonded to a fused or non-fused aromatic ring, b) at least one solvent-solubilizing chain, and other optional components to build molecular weight or modify the interaction of the dispersant with various particulates or continuous media.
Claims15
A polymer comprising a polymer chain having at least three imide groups, wherein each imide group is chemically bonded to an aromatic ring, the polymer is represented by Formula (1):
- wherein each variable is independently
- R1 is a non-hydrogen substituent and R1 is independently represented by one or more of an electron withdrawing selected from the group —NO2, —SO2NR′2, —C(O)R′, —SO3M, halogen, —NH2, and OR′, or an electron releasing alkyl group of 1 to 3 carbon atoms, the number of non-H substituted groups on Q defined by a is from 0 to 2;
- wherein M is H, a metal cation, NR′4+, or mixtures thereof;
- R′ is H or an optionally-substituted alkyl typically containing 1 to 20, and the optional substituent of R′, when present, is hydroxyl or halogen or mixtures thereof;
- Q is a fused or non-fused aromatic ring containing 4n+2 π-electrons, wherein n=1 or more, and Q is bonded to the imide group in such a way to form a 5 or 6 membered imide ring;
- b is 1 or 2, and when b is 2 the imide group is a side chain attached to Pol by two chemical bonds;
- d is 1, 2, or 3;
- and the imide groups are optionally attached to R2 at different carbon atoms of R2;
- R2 is a C1 to C20 hydrocarbylene group or a C1 to C20 hydrocarbonylene group or mixtures thereof;
- R2 optionally includes oxygen and/or nitrogen atoms wherein there is at least 2 carbon atoms per every oxygen or nitrogen of R2;
- W′ is a nitrogen atom, an oxygen atom or a direct bond;
- when b is 2 then one of the W′ is derived from a secondary amine reacted with said isocyanate and be in the R2 linking group between the imide and the other W′ group, when b is 2, each W′ group is the same or different;
- Pol is a polyurethane comprising at least two urethane and/or urea linkages and at least one of polyether, polyester, polyolefin and polyacrylate terminal chains, or mixtures of said terminal chains;
- wherein said at least one of polyether, polyester, polyolefin and polyacrylate terminal chains have a number average molecular weight of 700-4000 g/mole;
- wherein said polyurethane is from a polyisocyanate having isocyanate functionality of three or more, and
- w is 1 or more.
Dependencies are inferred from the claim text.