Dispersants resistant to color change
AssigneeE. I. Du Pont de Nemours and Company
InventorMichael W. J. West
Life of this patent
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Abstract
Acrylic AB block copolymers that are useful as pigment dispersants and which are resistant to yellowing and other color changes, characterized by aromatic substituents bonded to the A segment of the block copolymer.
Claims11
A block copolymer having at least one A segment and at least one B segment, each segment having a molecular weight of at least about 500 and the backbones of which consist essentially of at least one polymerized methacrylate or acrylate ester, at least 20% of the acrylic moieties of the A segment having bonded thereto a moiety derived from a carboxylic acid, an amide or sulfonamide which is a substituent of a phenyl aromatic;
- the phenyl aromatic having another substituent which is a conjugating group;
- the phenyl aromatic having no nitrogen, thiol, or OH group directly bonded to an aromatic ring, and wherein the B segment contains less than 20% of the acid, amide or sulfonamide moieties present in the A segment.
Dependencies are inferred from the claim text.