Production of paper and board

2:

• The process according to claim 1, wherein the aqueous composition comprises ≧50 wt % of water based on the aqueous composition.

3:

• The process according to claim 1, wherein the pH of the aqueous composition is in the range from 2 to 6.

4:

• The process according to claim 1, wherein the polymer having the primary amino group and/or amidine group is at least one selected from the group consisting of hydrolyzed homopolymers of N-vinylcarboxamide, hydrolyzed copolymers of N-vinylcarboxamide with further neutral monoethylenically unsaturated monomers, hydrolyzed copolymers of N-vinylcarboxamide with anionic monoethylenically unsaturated monomers, hydrolyzed copolymers of N-vinylcarboxamide with cationic monoethylenically unsaturated monomers, hydrolyzed homopolymers of N-vinylcarboxamide which have been converted in a polymer-analogous manner, Hofmann degradation products of homo- or copolymers of (meth)acrylamide, and polymers comprising ethyleneimine units.

5:

• The process according to claim 1, wherein the polymer having the primary amino group and/or amidine group is at least one selected from the group consisting of hydrolyzed copolymers of N-vinylcarboxamide with further neutral monoethylenically unsaturated monomers, hydrolyzed copolymers of N-vinylcarboxamide with anionic monoethylenically unsaturated monomers, and hydrolyzed copolymers of N-vinylcarboxamide with cationic monoethylenically unsaturated monomers, and
• wherein a degree of hydrolysis of said polymer is ≧10 mol %.

7:

• The process according to claim 1, wherein the polymer having having the primary amino group and/or amidine group is a partially or fully hydrolyzed copolymer of N-vinylcarboxamide with further neutral, anionic and/or cationic monoethylenically unsaturated monomers, wherein the monomer is at least one selected from the group consisting of acrylonitrile, vinyl acetate, sodium acrylate, diallyldimethylammonium chloride, [3-(dimethylamino)propyl]acrylamide, N-[3-(dimethylamino)propyl]methacrylamide, [3-(trimethylammonio)propyl]acrylamide chloride and N-[3-(trimethylammonio)propyl]methacrylamide chloride.

8:

• The process according to claim 1, wherein the polymer having the primary amino group and/or amidine group is a partially or fully hydrolyzed copolymer of N-vinylcarboxamide with sodium acrylate, and wherein a degree of hydrolysis of said polymer is ≧30 mol %.

9:

• The process according claim 1, wherein the polymer having the primary amino group and/or amidine group is a partially or fully hydrolyzed homopolymer of N-vinylcarboxamide, and wherein a degree of hydrolysis of said polymer is ≧30 mol %.

10:

• The process according to claim 1, wherein the aqueous composition comprises
• (a) 5 to 40 wt %, based on the aqueous composition, of polymer the primary amino group and/or amidine group with a combined content for these groups of ≧1.5 meq/g of polymer, and
• (b) 0.1 to 30 mol % of 1,4-cyclohexanedione (b) based on the combined amount of primary amino groups and amidine groups of the polymer.

11:

• The process according to claim 1, wherein the water-soluble polymeric anionic compound has an anionic charge density of >0.1 meq/g (at pH 7).

13:

• The process according to claim 1, wherein the water-soluble polymeric anionic compound is a copolymer selected from the group consisting of copolymers of acrylic acid and acrylamide, copolymers of acrylic acid and acrylonitrile, copolymers of acrylic acid and N-vinylformamide, copolymers of methacrylic acid and methacrylamide, copolymers of methacrylic acid and N-vinylformamide, copolymers of acrylic acid and methacrylamide, copolymers of acrylic acid and methacrylonitrile, copolymers of methacrylic acid and methacrylonitrile and copolymers of acrylic acid, acrylamide and acrylonitrile.

14:

• The process according to claim 1, wherein the polymeric anionic compound is a copolymer of acrylic acid with at least one monomer selected from the group consisting of vinylformamide, vinyl acetate, acrylonitrile and acrylamide.

15:

• The process according to claim 1, wherein the aqueous composition is added in an amount comprising from 0.01 to 6 wt % of the polymer the primary amino group and/or amidine group, based on fibrous material.

16:

• The process according to claim 1, wherein wastepaper is used as fibrous material.

17:

• Paper or board obtained according to a process of claim 1.