Michael addition adducts as additives for paper and papermaking
View Patent ↗Several Michael addition adducts of vinylamines with α,β. -unsaturated alkyl carbonyl compounds including amides, esters and acids, particularly acrylamide are presented. Additionally, a process for producing these Michael addition adducts is described. These adducts are generally useful in the manufacture of paper and are particularly useful as dry strength additives to make paperboard products using a papermaking machine.
1. A Michael addition adduct comprising the formula:
wherein X 1 is selected from the group consisting of carboxyl, carboxamide, hydroxyl, amine, alkylamine, alkanoxyl, alkenyl, alkyenyl, nitro and cyano groups and X 2 comprises any electron-withdrawing group or amine, R 1 and R 2 may be the same or different and are selected from the group consisting of H, alkyl, alkenyl, alkyenyl, carbonyl, carboxyl, and carboxamide groups, m and n and q are positive integers, representing numbers of its repeating unit distributed in the polymer in a random fashion, m+q ranges from 2,000 to 20,000, m/(m+q) ranges from 2/100 to 95/100 and n is a positive integer between 0 to 18,000.
2. The Michael addition adduct of claim 1 wherein X 2 may be selected from the group consisting of carboxamide, amine, acetoxyl, alkenyl, alkyenyl, nitro and cyano groups.
3. The Michael addition adduct of claim 1 wherein X 2 further comprises the formula:
Y—R 3
wherein Y is selected from the group consisting of carboxamide, sulphonamide, sulphonimide, sulphonyl, phosphonyl and NH groups and wherein R 3 is selected from the group consisting of H, OH, NH 2 , SH, short chain (C 1 -C 5 ) alkyl and long chain (C 6 -C 22 ) alkyl groups.
4. The Michael addition adduct of claim 3 wherein Y is CONH group, R 3 is CHOHCHO or H.
5. The Michael addition adduct of claim 3 , wherein R 1 and R 2 is selected from the group consisting of H, methyl and carboxyl, Y is carboxamide, R 3 is selected from the group consisting of H, OH, and methyl, m+n ranges from 1,000 to 10,000 and n/(m+n) ranges from 2/10 to 8/10.
6. The Michael addition adduct of claim 5 , wherein R 1 is H or carboxyl, R 2 is H, m+n ranges from 1,500 to 7,000 and n/(m+n) ranges from 2/10 to 8/10.
7. A process of producing a Michael addition adduct comprising the steps of
a) obtaining a vinylamine,
b) dissolving the vinylamine in a reaction medium,
c) reacting for a period of 2-5 hours the dissolved vinylamine under alkaline conditions at a reaction temperature of 10° C.-90° C. with a compound having at least one unsaturated bond conjugated to an electron-withdrawing group to produce the Michael addition adduct, and
wherein the Michael addition adduct comprises the formula:
wherein X 1 is selected from the group consisting of carboxyl, carboxamide, hydroxyl, amine, alkylamine, alkanoxyl, alkenyl, alkyenyl, nitro and cyano groups and X 2 comprises any electron-withdrawing group or amine, R 1 and R 2 may be the same or different and are selected from the group consisting of H, alkyl, alkenyl, alkyenyl, carbonyl, carboxyl, and carboxamide groups, m and n and q are positive integers, representing numbers of its repeating unit distributed in the polymer in a random fashion, m+q ranges from 2,000 to 20,000, m/(m+q) ranges from 2/100 to 95/100 and n is a positive integer between 0 to 18,000; and
wherein the compound having unsaturated bond conjugated to an electron-withdrawing group is selected from the group consisting of acrylamide, N-alkylacrylamide, methacrylamide, methyl acrylate, dimethyl maleate N-alkylmethacrylamide, N-(2-methylpropanesulfonic acid)acrylamide, N-(glycolic acid)acrylamide, N-[3-(propyl)trimethylammonium chloride]acrylamide, acrylonitrile, 2-(methacryloyloxy)ethyl]-trimethylammonium chloride, N-[3-(dimethylamino)propyl]methacrylamide, and N-ethylacrylamide.
8. The process according to claim 7 , wherein vinylamine has a molecular weight (M w ) in the range of from about 100,000 to about 1,000,000 Daltons.
9. The process according to claim 7 , wherein vinylamine ranges from about 1 to about 50% solids in the reaction medium.
10. The process according to claim 7 , wherein the reaction medium comprises water or an organic solvent.
11. The process according to claim 10 , wherein the dissolved vinylamine is reacted with the compound having at least one unsaturated bond conjugated to an electron-withdrawing group for a period of time from about 15 minutes to about 12 hours.
12. The process according to claim 7 , wherein the compound having unsaturated bond conjugated to an electron-withdrawing group is selected from the group consisting of acrylamide, methacrylamide, methyl acrylate, dimethyl maleate.
13. Process of using Michael addition adduct of claim 1 as a dry strength resin for paper products.
14. Process of using the Michael addition adduct of claim 1 as a wet strength resin for paper products.
15. Process of using the Michael addition adduct of claim 1 as a creping adhesive.
16. Process of using the Michael addition adduct of claim 1 as an adhesive.
17. Process of using the Michael addition adduct of claim 1 as a drainage aid or retention aid for papermaking.
18. Process of using the Michael addition adduct of claim 1 as a flocculant for water treatment.
19. Process of using the Michael addition adduct of claim 1 as a coagulant for water treatment.
20. Process of using the Michael addition adduct of claim 1 as a deposit control agent for papermaking process and water treatment.
21. A Michael addition adduct comprising:
a copolymer or terpolymer of vinylamine reacted with a monomer having at least one unsaturated bond conjugated to an electron-withdrawing group wherein the monomer having at least one unsaturated bond conjugated to an electron withdrawing group is selected from the group consisting of acrylamide, N-alkylacrylamide, methacrylamide, N-alkylmethacrylamide, and acrylonitrile.
22. The process according to claim 12 , wherein the compound having unsaturated bond conjugated to an electron-withdrawing group is selected from the group consisting of acrylamide and methacrylamide.
23. Process of using the Michael addition adduct produced by the process of claim 22 as a dry strength resin; a wet strength resin; a creping adhesive; a drainage aid or retention aid; or deposit control agent for papermaking process.