US5708095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft copolymers containing sulfonate and phosphonate groups having particular utility as pigmented ink dispersants
Assignee: EIDP Inc
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Filing: 1996-08-30
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Granted: 1998-01-13
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Expires: 2016-08-30
Abstract
Abstract A graft polymer having (a) a hydrophilic backbone prepared from unneutralized acid containing monomers wherein the acid has a pKa of at least 3, and wherein the backbone is completely soluble in water and insoluble in non-polar organic solvents; and (b) at least one discrete hydrophobic side chain, wherein 20 to 100% of the side chains are prepared from non-polar aliphatic or aromatic monomers having a chain length of at least 4 carbon atoms; wherein the side chains are attached to the backbone at a single terminal point and wherein the at least one discrete hydrophobic side chain has a weight average molecular weight of 1000 to 30,000. These graft polymers are useful as dispersants in aqueous solutions, particularly in ink jet inks.
Inventors
- 👤 Loretta Ann Grezzo Page
- 👤 Milan Bohuslav Bednarek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:26
CPC Classifications
C; C08; C08F; C08F273/00; C08F275/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
139 words
A dispersion comprising an aqueous carrier medium, a particulate solid, and a graft copolymer dispersant consisting essentially of: (a) a hydrophilic backbone wherein 2 to 100% of the backbone is prepared from monomers containing an acid which, in unneutralized form, has a pKa up to or equal to 3, and wherein the backbone is soluble in water and insoluble in non-polar organic solvents; and (b) at least one discrete hydrophobic side chain, wherein 20 to 100% of the side chain(s) are prepared from non-polar aromatic monomers or aliphatic monomers having a chain length of at least 4 carbon atoms; wherein (i) at least one side chain has a weight average molecular weight in the range of 1,000 to 30,000 and (ii) the weight ratio of hydrophobic side chain(s) to hydrophilic backbone is in the range of 90:10 to 10:90.
Claim 2
Dependent Claim
139 words
A dispersion comprising an aqueous carrier medium, a particulate solid, and a graft copolymer dispersant consisting essentially of: (a) a hydrophilic backbone wherein 2 to 100% of the backbone is prepared from monomers containing an acid which, in unneutralized form, has a pKa up to or equal to 3, and wherein the backbone is soluble in water and insoluble in non-polar organic solvents; and (b) at least one discrete hydrophobic side chain, wherein 20 to 100% of the side chain(s) are prepared from non-polar aromatic monomers or aliphatic monomers having a chain length of at least 4 carbon atoms; wherein (i) at least one side chain has a weight average molecular weight in the range of 1,000 to 30,000 and (ii) the weight ratio of hydrophobic side chain(s) to hydrophilic backbone is in the range of 90:10 to 10:90.
Claim 3
Dependent Claim
28 words
The dispersion of claim 1 wherein the weight ratio of hydrophobic side chain(s) to hydrophilic backbone of said graft copolymer is in the range of 20:80 to 50:50.
Claim 4
Dependent Claim
46 words
The dispersion of claim 1 wherein at least 20% by weight of monomer used to prepare said hydrophobic side chain(s) of said graft copolymer is selected from the group consisting of aryl esters of acrylic or methacrylic acid, N-aryl acrylamide or methacrylamide, and vinyl aryl esters.
Claim 5
Dependent Claim
21 words
The dispersion of claim 3 wherein additional monomer is present during preparation of the graft copolymer to modify physical properties thereof.
Claim 6
Dependent Claim
31 words
The dispersion of claim 4 wherein said additional monomer is selected from the group consisting of alkyl esters of acrylates or methacrylates, N-alkyl substituted acrylamides or methacrylamides, and vinyl alkyl esters.
Claim 7
Dependent Claim
28 words
The dispersion of claim 4 wherein said additional monomer includes a hydrophilic ionic monomer up to 20% by weight, based on the total weight of said graft copolymer.
Claim 8
Dependent Claim
14 words
The dispersion of claim 4 wherein said additional monomer includes a hydrophilic non-ionic monomer.
Claim 9
Dependent Claim
20 words
The dispersion of claim 4 wherein said additional monomer has at least one functional group that binds to particulate solids.
Claim 10
Dependent Claim
86 words
The dispersion of claim wherein said hydrophilic backbone of said graft/copolymer contains a monomer selected from the group consisting of: CH.sub.2 ═C(R.sup.3) C(O)OX.sub.n (CH.sub.2 CH.sub.2 O).sub.m !--R.sup.4 wherein n is 0 or 1; when n is 1, X is an alkyl, aryl, or alkylaryl diradical connecting group of 1 to 9 carbon atoms; m is 1 to 100, R 3 is H or CH 3 ; and R 4 is selected from the group consisting of H and alkyl groups of 1 to 4 carbon atoms.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-12 | 2001-07-14 | 2002-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-12 | 2005-07-14 | 2006-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-12 | 2009-07-14 | 2010-01-13 | $7700.00 | Window Closed / Lapsed |