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US 5,852,123 AGranted
Graft copolymer with a urea or imid functional group as a pigment dispersant
AssigneeE. I. Du Pont de Nemours and Company
InventorJozef Huybrechts
Life of this patent
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Abstract
A polymeric dispersant for pigments based on an acrylic graft copolymer wherein the graft copolymer has a weight average molecular weight of at least 1500 and has 2 to 97% by weight of a polymeric backbone and 97-2% by weight of macromonomer side chains attached to the backbone and wherein the graft copolymer has at least about 1 weight percent of an imid or urea functional dispersing substituent attached to the backbone, the macromonomer, or both the backbone and the macromonomer.
Claims17
A pigment dispersant, comprising:
- (a) from about 2 to 97 weight percent of a polymeric backbone of ethylenically unsaturated monomers;
- (b) from about 97 to 2 weight percent of a macromonomer having one terminal ethylenically unsaturated group, said macromonomer grafted onto said backbone by said terminal group;
- and
- (c) at least about 1 weight percent of a dispersing substituent attached at a location selected from the group consisting of the backbone, the macromonomer, and both the backbone and the macromonomer, said dispersing substituent selected from the group consisting of
- i) imid functional compounds represented by the formula ##STR9## ii) urea functional compounds represented by the formula ##STR10## and iii) mixtures of i) and ii), wherein each R and each R' is independently selected from the group consisting of hydrogen;
- saturated, substituted aliphatic and alicyclic compounds;
- saturated, unsubstituted aliphatic and alicyclic compounds;
- unsaturated, substituted aliphatic and alicyclic compounds;
- unsaturated, unsubstituted aliphatic and alicyclic compounds;
- substituted aromatic and heterocyclic compounds;
- unsubstituted aromatic and heterocyclic compounds;
- and divalent radicals including --NH--, oxygen and sulfur.
9 more elements
A process for producing a pigment dispersant, comprising the steps of:
- a) polymerizing a macromonomer is the presence of a cobalt chain transfer agent such that said macromonomer contains one terminal ethylenically unsaturated group;
- and
- b) grafting said macromonomer onto a polymeric backbone comprising ethylenically unsaturated monomers, and
- c) adding a dispersing substituent during step a), b), or both a) and b) such that said dispersing agent attaches to the macromonomer, the backbone, or both the macromonomer and the backbone, said dispersing substituent selected from the group consisting of
- i) imid functional compounds represented by the formula ##STR11## ii) urea functional compounds represented by the formula ##STR12## and iii) mixtures of i) and ii), wherein each R and each R' is independently selected from the group consisting of hydrogen;
- saturated, substituted aliphatic and alicyclic compounds;
- saturated, unsubstituted aliphatic and alicyclic compounds;
- unsaturated, substituted aliphatic and alicyclic compounds;
- unsaturated, unsubstituted aliphatic and alicyclic compounds;
- substituted aromatic and heterocyclic compounds;
- unsubstituted aromatic and heterocyclic compounds;
- and divalent radicals including --NH--, oxygen and sulfur.
9 more elements
Dependencies are inferred from the claim text.