Aqueous pigmented inks for ink jet printers
First Claim
Patent Images
1. 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
space="preserve" listing-type="equation">CH.sub.2 ═
C(X)(Y) wherein X is H or CH3;
and Y is C(0)OR1, C(O)NR2 R3, or CN, wherein R1 is an alkyl, aryl, or alkylaryl group having 1 to 20 carbon atoms, and R2 and R3 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
space="preserve" listing-type="equation">CH.sub.2 ═
C(X) (Y.sup.1), wherein X is H or CH3;
and Y1 is C(O)OH, C(O)NR2 R3, C(O)OR4 NR2 R3 or C(O)OR5 ;
wherein R2 and R3 are hydrogen or an alkyl, aryl, or alkylaryl group having 1 to 9 carbon atoms;
R4 is an alkyl diradical having 1 to 5 carbon atoms; and
R5 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
space="preserve" listing-type="equation">CH.sub.2 ═
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.
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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.
687 Citations
25 Claims
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1. A pigmented ink comprising an aqueous carrier medium and particles of pigment stabilized by an AB or BAB block copolymer wherein:
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(a) the A segment is a hydrophobic homopolymer or copolymer of an acrylic monomer having the formula
space="preserve" listing-type="equation">CH.sub.2 ═
C(X)(Y)wherein X is H or CH3;
and Y is C(0)OR1, C(O)NR2 R3, or CN, wherein R1 is an alkyl, aryl, or alkylaryl group having 1 to 20 carbon atoms, and R2 and R3 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
space="preserve" listing-type="equation">CH.sub.2 ═
C(X) (Y.sup.1),wherein X is H or CH3;
and Y1 is C(O)OH, C(O)NR2 R3, C(O)OR4 NR2 R3 or C(O)OR5 ;
wherein R2 and R3 are hydrogen or an alkyl, aryl, or alkylaryl group having 1 to 9 carbon atoms;
R4 is an alkyl diradical having 1 to 5 carbon atoms; and
R5 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
space="preserve" listing-type="equation">CH.sub.2 ═
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification