Use of mixtures, salts or condensates of a maleic acid - or itaconsaeuremischpolymerisat and an amino resin for the manufacture of paper.

摘要

A treating agent for porous or fibrous substrates comprises (1) a mixture of (a) a water-soluble anionic linear polymer of (i) maleic acid, maleic anhydride or itaconic acids or salts thereof or a mixture of two or all of these substances and (ii) at least one other ethylenically unsaturated monomer copolymerizable therewith, in approximately equimolar proportions, with the proviso that when the polymer (a) contains copolymerized acrylamide and itaconic acid or salts thereof there is from 1 to 3 moles of acrylamide per mole of itaconic acid or salt thereof, the polymer (a) being in the form of a completely neutralized ammonium or alkali metal sa and (b) a water-soluble or water-dispersible amphotaric or cationic aminoplast resin; the mole ratio of (a) to (b) in the mixture being from 15 : 1 to 1 : 15; or (2) a complex salt of the free acid or partially neutralized form of (a) with (b), the mole ratio of (a) to (b) in the complex being from 15 : 1 to 1 : 15; or (3) a condensate of a form of (a) which contains at least one reactive anhydride or carboxyl group with (b) or (c) a water-soluble or water-dispersible amphoteric or cationic amino resin base, the amount of (b) or (c) being sufficient to react with all the said reactive groups of (a). The polymer (a) may be modified to form (a1) an amide amine sa (b1) a condensate with a salt of a substituted or unsubstituted sulphoaminomethane; (c1) a condensate of an amide ammonium salt of the polymer with the salt of a sulphohydroxymethane; (d1) a condensate of molar proportions of (c1) with formaldehyde or (e1) a condensate of an amide ammonium salt of the polymer with itaconic acid. The cationic aminoplast resins (b) are prepared by interreacting or condensing an amino resin base with an aldehyde, preferably formaldehyde or a compound which liberates formaldehyde and the amphoteric aminoplast resins (b) are obtained by introducing anionic substituents, e.g. carboxy and sulpho groups, into the cationic aminoplast resins. Amino resin bases which can be condensed with formaldehyde are dicyandiamide; guanidine; guanylurea; urea; thiourea; buiret; melamine; ameline; amelide; cyanuric acid and guanamine. Alternatively, the amphoteric aminoplast resins may be formed by condensing unsaturated dibasic acids such as itaconic, maleic acid and maleic anhydride or their monoammonium salts with equimolar amounts of dicyandiamide in aqueous solution, followed if desired by condensing the product with an aldehyde. The order of condensing may be reversed. Modified amino resin bases, e.g. the sodium or potassium salt of sulpho methyl dicyandiamide, can be reacted with an aldehyde to give the amphoteric resin. Amino resin bases (c) which may be condensed with (a) are mentioned above and in addition the sodium salt of sulphomethyl dicyandiamide and condensates of dicyandiamide and itaconic acid or maleic acid or anhydride. Specifications 777,827 and 998,380 are referred to.ALSO:A composition useful as a pretanning agent, a retanning agent, a tanning agent or an auxiliary tanning agent for preparing improved leather products, e.g. resistant to ultraviolet rays, comprises (i) a mixture of an anionic linear polymer (a) and a water-soluble or water-dispersible amphoteric or cationic aminoplast resin (b); or (ii) a complex salt of the free acid or partially neutralized form of (a) with (b); or (iii) a condensate of a form of (a) which contains at least one reactive anhydride or carboxyl group with (b) or (c) a water-soluble or water-dispersible amphoteric or cationic amino resin base. The polymer (a) is a copolymer of maleic acid or anhydride or itaconic acid or salts thereof or a mixture of two or all of these substances with at least one other ethylenically unsaturated monomer copolymerizable therewith, with the proviso that when the polymer (a) contains copolymerized acrylamide and itaconic acid or salts thereof, there are from 1-3 moles of acrylamide per mole of itaconic acid or salt thereof, the polymer (a) being in the form of a completely neutralized ammonium or alkali metal salt. A preferred cationic aminoplast resin (b) comprises a condensate of 1 mol of guanylurea and 4 mols of formaldehyde, further condensed with 3 mols of urea. Amino resin bases (c) may be dicyandiamide or salts thereof, guanidine, guanylurea, urea, thiourea, biuret, melamine, ameline, amelide, cyanuric acid and guanamine. When a mixture (i) or complex salt (ii) of (a) and (b) is employed, the mol ratio of (a) to (b) is from 15:1 to 1:15. In the examples chrome-tanned calf skins, chrome-tanned sheep skins, pickled sheep skins and shaved chrome-tanned side leather are treated. Specifications 777,827 and 998,380 are referred to.ALSO:Cork and paper may be treated with (i) a mixture of an anionic linear polymer (a) and a watersoluble or water-dispersible amphoteric or cationic aminoplast resin (b); or (ii) a complex salt of the free acid or partially neutralised form of (a) with (b); or (iii) a condensate of a form of (a) which contains at least one reactive anhydride or carboxyl group with (b) or (c) a water-soluble or water-dispersible amphoteric or cationic amino resin base, the amount of (b) or (c) being sufficient to react with all the said reactive groups of (a). The polymer (a) is a copolymer of maleic acid or anhydride, or itaconic acid or salts thereof or a mixture of two or all of these substances with at least one other ethylenically unsaturated monomer copolymerizable therewith in approximately aquinolar proportions, with the proviso that when the polymer (a) contains copolymerized acrylamide and itaconic acid or salts thereof, there is from 1 to 3 moles of acrylamide per mole of itaconic acid or salt thereof, the polymer (a) being in the form of a completely neutralised ammonium or alkali metal salt. A preferred cationic aminoplast resin (b) comprises a condensate of one mol of guanylurea and four mols of formaldehyde further condensed with three mols of urea. Amino resin bases (c) may be dicyandiamide or salts thereof, guanidine, guanylurea, urea, thiourea, buiret, melamine, ameline, amelide, cyanuric acid and guanamine. When a mixture (i) or complex salt (ii) of (a) and (b) is employed the mole ratio of (a) to (b) is from 15 : 1 to 1 : 15. In the case of paper the treating agent can act as a dye-assistant or as a filler by addition to the beater. Specifications 777,827 and 998,380 are referred to.