Claims
- 1. A lithographic printing ink composition comprising:
- a) as a dispersant, at least one ester-modified carboxyl-containing copolymer being a reaction product of a long chain alcohol containing from 6 to 22 carbon atoms and a styrene maleic anhydride copolymer, wherein at least 35% of the carboxyl groups of the styrene maleic anhydride copolymer are esterified to form the reaction product;
- (b) (i) a solvent selected from the group consisting of aliphatic hydrocarbons, aromatic hydrocarbons, and mixtures thereof; or (ii) a modifying oil selected from the group consisting of animal oils, vegetable oils, and mixtures thereof; or (iii) a combination of (i) and (ii);
- (c) a liquid carrier resin selected from the group consisting of alkyd resins, phenolic resins, and mixtures thereof; and
- (d) at least one pigment.
- 2. A lithographic printing ink as defined in claim 1 wherein the long chain alcohol is a straight or branched C.sub.10-22 monohydric alcohol.
- 3. A lithographic printing ink as defined in claim 2 wherein the long chain alcohol is a straight or branched C.sub.12-18 monohydric alcohol.
- 4. A lithographic printing ink as defined in claim 3 wherein the long chain alcohol is selected from the group consisting of cetyl alcohol, oleyl alcohol, stearyl alcohol, and mixtures thereof.
- 5. A lithographic printing ink as defined in claim 1 wherein the modifying oil is a linseed oil.
- 6. A lithographic printing ink as defined in claim 1 wherein at least approximately 40% of the carboxyl groups of the styrene maleic anhydride are esterified to form the ester-modified carboxyl-containing copolymer.
- 7. A lithographic printing ink as defined in claim 1 wherein the weight ratio of pigment to ester-modified carboxyl-containing copolymer is from approximately 300:1 to approximately 50:1.
- 8. A lithographic printing ink as defined in claim 7 wherein the weight ratio of pigment to ester-modified carboxyl-containing copolymer is from approximately 200:1 to approximately 75:1.
- 9. A lithographic printing ink as defined in claim 8 wherein the weight ratio of pigment to ester-modified carboxyl-containing copolymer is approximately 100:1.
- 10. A process for making an improved lithographic printing ink comprising:
- a) reacting a styrene maleic anhydride copolymer with a long chain alcohol containing from 6 to 22 carbon atoms to produce an ester-modified carboxyl-containing copolymer, wherein at least 35% of the carboxyl groups of the styrene maleic anhydride copolymer are esterified to form the ester-modified carboxyl-containing copolymer;
- b) combining the ester-modified carboxyl-containing copolymer with (i) a solvent selected from the group consisting of aliphatic hydrocarbons, aromatic hydrocarbons, and mixtures thereof; or (ii) a modifying oil selected from the group consisting of animal oils, vegetable oils, and mixtures thereof; or (iii) a combination of (i) and (ii) to form a solution of said ester-modified carboxyl-containing copolymer in said solvent or modifying oil;
- c) combining the solution from step (b) with at least one liquid carrier resin selected from the group consisting of alkyd resins, phenolic resins, and mixtures thereof, and at least one pigment.
- 11. A process as defined in claim 10 wherein the long chain alcohol is a straight or branched C.sub.10-22 monohydric alcohol.
- 12. A process as defined in claim 11 wherein the long chain alcohol is a straight or branched C.sub.12-18 monohydric alcohol.
- 13. A process as defined in claim 12 wherein the long chain alcohol is selected from the group consisting of cetyl alcohol, oleyl alcohol, stearyl alcohol, and mixtures thereof.
- 14. A process as defined in claim 10 wherein the modifying oil is linseed oil.
- 15. A process as defined in claim 10 wherein approximately 50% of the carboxyl groups of the styrene maleic anhydride copolymer are esterified to form the ester-modified carboxyl-containing copolymer.
- 16. A process as defined in claim 10 wherein the weight ratio of pigment to ester-modified carboxyl-containing copolymer is from approximately 300:1 to approximately 50:1.
- 17. A process as defined in claim 16 wherein the weight ratio of pigment to ester-modified carboxyl-containing copolymer is from approximately 200:1 to approximately 75:1.
- 18. A process as defined in claim 17 wherein the weight ratio of pigment to ester-modified carboxyl-containing copolymer is approximately 100:1.
Parent Case Info
This is a continuation-in-part of patent application Ser. No. 08/479,278 filed Jun. 7, 1995 now U.S. Pat. No. 5,811,481.
US Referenced Citations (15)
Foreign Referenced Citations (4)
Number |
Date |
Country |
077594 |
Sep 1985 |
EPX |
2338642 |
Mar 1975 |
DEX |
56-62809 |
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JPX |
991908 |
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GBX |
Continuation in Parts (1)
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Number |
Date |
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Parent |
479278 |
Jun 1995 |
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