초록 ▼

Synthetic co-polymers having moieties capable of forming hydrogen bonds, ionic bonds, or covalent bonds with cellulose fibers and paper modifying moieties capable of modifying a paper sheet are disclosed. These synthetic co-polymers are derived from the reaction of an aldehyde functional polymer and

Synthetic co-polymers having moieties capable of forming hydrogen bonds, ionic bonds, or covalent bonds with cellulose fibers and paper modifying moieties capable of modifying a paper sheet are disclosed. These synthetic co-polymers are derived from the reaction of an aldehyde functional polymer and an aldehyde reactive paper modifying agent containing a non-hydroxyl aldehyde reactive functional group.

대표청구항 ▼

We claim: 1. A method of making a paper sheet comprising: (a) forming an aqueous suspension of papermaking fibers; (b) adding to the aqueous suspension, prior to web formation, a water soluble or water dispersible aldehyde functional ionic polymer followed by the addition of a paper modifying agent

We claim: 1. A method of making a paper sheet comprising: (a) forming an aqueous suspension of papermaking fibers; (b) adding to the aqueous suspension, prior to web formation, a water soluble or water dispersible aldehyde functional ionic polymer followed by the addition of a paper modifying agent having a non-hydroxyl aldehyde reactive functional group, which react according to the following reaction: (c) filtering and washing the papermaking fibers containing the aldehyde functional ionic polymer reacted with derivatized paper modifying agent; (d) depositing the aqueous suspension of papermaking fibers onto a forming fabric to form a web; and (e) dewatering and drying the web to form a paper sheet, wherein: b, c, f>0; a, e≧0; e+f=b; w≧1; Q1=a monomer unit or a block or graft copolymer prepared from the polymerization of one or more ethylenically unsaturated compounds, said monomer unit or block or graft copolymer containing a pendant group capable of forming hydrogen bonds with cellulose; R1, R1′, R1″=independently H or C1-4 alkyl; R2=any linear or branched, aliphatic or aromatic, saturated or unsaturated, substituted or unsubstituted hydrocarbon group containing a pendant aldehyde functionality; R3=an aliphatic hydrocarbon, an amphiphilic hydrocarbon, humectant or other agent capable of modifying the paper sheet; Z1=a reactive group capable of reacting with an aldehyde in an aqueous environment to form a covalent bond which is stable in the aqueous environment; Z2=the covalently bonded bridging radical formed by the reaction of the aldehyde functionality with Z1 functional moiety; and Q3=a monomer unit or a block or graft copolymer, said monomer unit or block or graft copolymer containing a charge functionality wherein the charge functionality is selected from the group consisting of cationic, anionic and amphoteric. 2. The method of claim 1, wherein the pendant group on Q1 capable of forming hydrogen bonds is selected from the group consisting of: —CONH2; —COOH; —COO−M+; —OH; and, mixtures thereof, wherein M+ is a counter ion. 3. The method of claim 1, wherein M+ is a counter ion selected from the group consisting of: Na+; K+; Ca+; and, mixtures thereof. 4. The method of claim 1, wherein Z1 is selected from the group consisting of: primary amines —NH2; secondary amines —NH—; amides —CONH2; thiols —SH; sulfinic acids —SO2OH; sulfonamides —SO2NH2; and, mixtures thereof. 5. The method of claim 1, wherein the hydrocarbon group R2 containing aldehyde functionality is selected from the group consisting of: —CONHCHOHCHO; —CONHCHOH(CH2)2CHO; and, mixtures thereof. 6. The method of claim 1, wherein the aldehyde functional polymer is selected from the group consisting of: water dispersible anionic aldehyde functional polymers; water dispersible cationic aldehyde functional polymers; water dispersible non-ionic aldehyde functional polymers; water-soluble anionic aldehyde functional polymers; water-soluble cationic aldehyde functional polymers; and, water-soluble non-ionic aldehyde functional polymers. 7. The method of claim 1, wherein the R3 moiety is a linear or branched, saturated or unsaturated, aromatic or aliphatic hydrocarbon of C2 to C40 chain length. 8. The method of claim 1, wherein the aldehyde reactive paper modifying agent is an amphiphilic hydrocarbon, polyether, or polyhydroxy compound containing a non-hydroxyl aldehyde reactive group. 9. The method of claim 8, wherein the aldehyde functional polymer is a cationic, anionic, or non-ionic glyoxylated polyacrylamide and the non-hydroxyl aldehyde reactive functional group of the aldehyde reactive paper modifying agent is a primary amine, secondary amine or unsubstituted amide. 10. The method of claim 8, wherein the aldehyde reactive paper modifying agent is selected from the group consisting of: 1-amino-2-propanol; 2-amino-1-propanol; 3-amino-1,2-propanediol; tris(hydroxymethyl) aminomethane; diethanol amine; 1-amino-1-deoxy-D-sorbitol (glucamine); glucosamine; N-methyl glucamine; 2-aminoethyl hydrogen sulfate; 2-amino-2-ethyl-1,3-propanediol; 2-amino-1phenyl-1,3-propanediol; 2-amino-1,3-propanediol; 3-amino-1-propanol; ethanolamine; 3-amino-2-hydroxy propionic acid; 1-amino-2,3,4-trihydroxybutane; 4-amino-2-hydroxybutyric acid; aspartic acid; 2-amino-2-methyl-1,3-propanediol; 2-amino-1,3-propanediol; 3-mercapto-1,2-propanediol; mercaptosuccinic acid; and, mixtures thereof. 11. The method of claim 8, wherein the aldehyde reactive paper modifying agent is a derivative of a polyalkyleneoxy functional compound. 12. The method of claim 8, wherein the aldehyde reactive paper modifying agent is a polyalkyleneoxy amine, diamine, thiol, dithiol, unsubstituted amide, or unsubstituted diamide. 13. The method of claim 8, wherein the aldehyde reactive paper modifying agent is a polyalkyleneoxy compound having the following structure: wherein: Z4=a non-hydroxyl aldehyde reactive functionality selected from the group consisting of: primary amine; secondary amine; thiol; or, unsubstituted amide; a, b, c=integers greater≧0 such that a+b+c≧2; n=an integer≧2 and≦6; and, R=H; C1-C30 linear or branched, substituted or non-substituted, aliphatic or aromatic, saturated or unsaturated hydrocarbon; —[CH2CHCH3]—Z4; or, —[(CH2)n]—Z4. 14. The method of claim 8, wherein the aldehyde reactive paper modifying agent is an amino acid. 15. The method of claim 1, wherein the Z2 moiety is selected from the group consisting of: —CONHCHOHCHOHNH—; —CONHCHOHCH=N—; —CONHCHOHCH(NH—)2; and, mixtures thereof. 16. The method of claim 1, wherein Q3 is 17. The method of claim 1, wherein Q3 is a radical of the form —CHR1CR0R1′— wherein: R0=a pendant group of the form Z1—R10—W, where Z1 is a radical bonding the R10 group to the synthetic co-polymer; R1, R1′=independently H or a C1-4 alkyl group; R10=any linear or branched, aliphatic or aromatic hydrocarbon of at least a C2 chain length; and, W=—N=R11, R12, R13 where R11, R12, and R13 are each independently a C1-4 alkyl group. 18. The method of claim 1, wherein the pendant group on Q1 capable of forming hydrogen bonds is —CONH2. 19. The method of claim 1, further comprising resuspending the papermaking fibers. 20. The method of claim 1, wherein e=0. 21. The method of claim 1, wherein e>0. 22. The method of claim 1, further comprising adding a molar excess of the derivatized paper modifying agent having a non-hydroxyl aldehyde reactive functional group relative to the number of available aldehyde groups on the aldehyde functional ionic polymer. 23. The method of claim 22, further comprising filtering and washing the papermaking fibers thereby removing excess of the paper modifying agent having a non-hydroxyl aldehyde reactive functional group.