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US 5,085,698 AGranted
Aqueous pigmented inks for ink jet printers
AssigneeE. I. Du Pont de Nemours and Company
InventorsSheau-Hwa Ma, Howard Matrick, Arthur C. Shor, Harry J. Spinelli
Life of this patent
Estimating the term…
Abstract
A pigmented ink for ink jet printers which comprises an aqueous carrier medium, and pigment particles dispersed in an AB or BAB block copolymer having a hydrophilic segment and a segment that links to the pigment. The A block and the B block(s) have molecular weights of at least 300. These inks give images having good print quality, water and smear resistance, lightfastness, and storage stability.
Claims25
A pigmented ink comprising an aqueous carrier medium and particles of pigment stabilized by an AB or BAB block copolymer wherein:
- (a) the A segment is a hydrophobic homopolymer or copolymer of an acrylic monomer having the formula
- CH.sub.2 .dbd.C(X)(Y)
- wherein X is H or CH.sub.3;
- and Y is C(0)OR.sub.1, C(O)NR.sub.2 R.sub.3, or CN, wherein R.sub.1 is an alkyl, aryl, or alkylaryl group having 1 to 20 carbon atoms, and R.sub.2 and R.sub.3 are hydrogen or an alkyl, aryl, or alkylaryl group having 1 to 9 carbon atoms;
- said A segment having an average molecular weight of at least approximately 300 and being water insoluble;
- and
- (b) the B segment is a hydrophilic polymer, or salt thereof, of
- (1) an acrylic monomer having the formula
- CH.sub.2 .dbd.C(X) (Y.sup.1),
- wherein X is H or CH.sub.3;
- and Y.sup.1 is C(O)OH, C(O)NR.sub.2 R.sub.3, C(O)OR.sub.4 NR.sub.2 R.sub.3 or C(O)OR.sub.5 ;
- wherein R.sub.2 and R.sub.3 are hydrogen or an alkyl, aryl, or alkylaryl group having 1 to 9 carbon atoms;
- R.sub.4 is an alkyl diradical having 1 to 5 carbon atoms;
- and R.sub.5 is an alkyl group having 1 to 20 carbon atoms and containing one or more hydroxyl or ether groups;
- or
- (2) a copolymer of the acrylic monomer of (1) with an acrylic monomer having the formula
- CH.sub.2 .dbd.C(X)(Y)
- where X and Y are the substituent groups defined for said A segment;
- said B segment having an average molecular weight of at least approximately 300 and being water soluble, with the proviso that said B segment(s) constitute approximately 10 to 90% of said block copolymer, by weight.
16 more elements
Dependencies are inferred from the claim text.