Terpolymer compositions for coating substrates used in computer printers
View Patent ↗Terpolymer compositions of vinyl caprolactam (VCL), dimethylaminopropyl methacrylamide (DMAPMA) and hydroxyethyl methacrylate (HEMA) are described to coat substrates for use in computer printers, and provide advantageous print quality thereon.
1. A terpolymer composition consisting essentially of vinyl caprolactam (VCL), dimethylaminopropyl methacrylamide (DMAPMA) and hydroxyethyl methacrylate (HEMA), uncrosslinked or crosslinked, unquaternized or quaternized, which exhibits light stability to dyes found in ink-jet printers, as evidenced by a less than 25% color fading in the ASTM G-53-84 test.
2. A terpolymer according to claim 1 which is uncrosslinked.
3. A terpolymer according to claim 1 which is crosslinked.
4. A terpolymer according to claim 1 which is unquaternized.
5. A terpolymer according to claim 1 which is quaternized.
6. A terpolymer according to claim 1 which is crosslinked and quaternized.
7. A water/alcohol solution of the terpolymer of claim 1 .
8. A water/alcohol solution of the terpolymer of claim 6 .
9. A water solution of the terpolymer of claim 1 .
10. A water solution of the terpolymer of claim 6 .
11. A water/alcohol solution of 20-40% solids of the terpolymer of claim 1 .
12. A water/alcohol solution of 25-35% solids of the terpolymer of claim 1 .
13. A water/alcohol solution containing 20-40% solids of the terpolymer of claim 6 .
14. A water/alcohol solution containing 25-35% solids of the terpolymer of claim 6 .
15. A water/alcohol solution of claim 1 having a viscosity of 3,000 to 25,000 cps (LV#4, 12 rpm, 25° C., 30% solids).
16. A terpolymer according to claim 1 which is in the form of a powder.
17. A terpolymer according to claim 6 which is in the form of a powder.
18. A terpolymer composition according to claim 1 comprising, by wt., 60-90% VCL, 10-30% DMAPMA and 2-10% HEMA.
19. A terpolymer composition according to claim 18 comprising 75-80% VCL, 13-16% DMAPMA and 4-6% HEMA.
20. A terpolymer composition according to claim 18 including up to about 0.8% of a crosslinking agent.
21. A terpolymer composition according to claim 18 including up to 40% of a quaternizing agent.
22. A terpolymer composition according to claim 18 in which the crosslinking agent is pentaerythriol triallyl ether (PETE).
23. A terpolymer according to claim 18 in which the quaternizing agent is HCI.
24. A terpolymer according to claim 18 in which the crosslinking agent is present in an amount of 0.5-0.7% by wt. of the terpolymer.
25. A terpolymer according to claim 21 in which quaternizing agent is present in an amount of 2.5-3.5% by wt. of the terpolymer.
26. A process of making the terpolymer composition of claim 1 which comprises polymerizing the monomers in an aqueous-alcohol solvent.
27. A process according to claim 21 wherein said alcohol is ethanol or isopropyl alcohol.
28. A process according to claim 26 which is carried out at 20-40% solids.
29. A process according to claim 26 which is carried out in the presence of a crosslinking agent.
30. A process according to claim 26 which is carried out in the absence of a crosslinking agent.
31. A process according to claim 26 in which the product is thereafter quaternized.
32. A process according to claim 26 including the additional step of removing the alcohol solvent to provide a water solution of the terpolymer.
33. A process according to claim 31 in which the water solution is dried to provide the terpolymer in the form of a powder.
34. A terpolymer according to claim 1 which is post-treated and crosslinked.
35. A terpolymer according to claim 1 which is post-treated with a polyepoxide, melamine/formaldehyde resin, or aziridine crosslinker.