Deliming composition and method for deliming hides

A deliming process for deliming a hide for deliming, the deliming process comprises the following process steps:

• a) providing a hide for deliming;
• and
• b) treating the hide for deliming with a deliming agent, the deliming agent comprising a graft polymer of at least one of polysaccharides, polypeptides or derivatives thereof, wherein the derivatives of polysaccharides are oxidatively, hydrolytically or enzymatically degraded polysaccharides, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides or chemically modified mono-, oligo- or polysaccharides and wherein the derivatives of the polypeptides are hydrolytically or enzymatically degraded polypeptides,
• the graft polymer being obtainable by radical polymerization of
• A) a monomer selected from or a monomer mixture of
• (a) acrylic acid or methacrylic acid or a mixture thereof or the alkali metal, alkaline earth metal or ammonium salts thereof, and at least one of (b) and (c), where
• (b) comprises monoethylenically unsaturated monomers other than the monomers (a) and copolymerizable with the monomer (a), and where
• (c) comprises monomers having at least two ethylenically unsaturated, nonconjugated double bonds in the molecule,
• in the presence of at least one of
• B1) polysaccharides, oxidatively, hydrolytically or enzymatically degraded polysaccharides, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides, chemically modified mono-, oligo- or polysaccharides, or mixtures thereof, and
• B2) polypeptides, hydrolytically or enzymatically degraded and optionally chemically modified polypeptides, or mixtures thereof.

A process for producing leather, comprising the process steps of:

• i) providing a raw hide;
• ii) liming or painting the raw hide;
• iii) deliming the raw hide;
• and
• iv) tanning the raw hide,
• wherein the deliming of the raw hide in process step iii) is carried out using a deliming agent which comprises a graft polymer of at least one of polysaccharides, polypeptides or derivatives thereof, wherein the derivatives of polysaccharides are oxidatively, hydrolytically or enzymatically degraded polysaccharides, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides er chemically modified mono-, oligo- or polysaccharides and wherein the derivatives of the polypeptides are hydrolytically or enzymatically degraded polypeptides,
• the graft polymer being obtainable by radical polymerization of
• A) a monomer selected from or a monomer mixture of
• (a) acrylic acid or methacrylic acid or a mixture thereof or the alkali metal, alkaline earth metal or ammonium salts thereof, and at least one of (b) and (c), where
• (b) comprises monoethylenically unsaturated monomers other than the monomers (a) and copolymerizable with the monomer (a), and where
• (c) comprises monomers having at least two ethylenically unsaturated, nonconjugated double bonds in the molecule,
• in the presence of at least one of
• B1) polysaccharides, oxidatively, hydrolytically or enzymatically degraded polysaccharides, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides, chemically modified mono-, oligo- or polysaccharides, or mixtures thereof, and
• B2) polypeptides, hydrolytically or enzymatically degraded polypeptides, or mixtures thereof.

A leathermaking intermediate delimed with a graft polymer, the graft polymer comprising a graft polymer of at least one of polysaccharides, polypeptides or derivatives thereof, wherein the derivatives of polysaccharides are oxidatively, hydrolytically or enzymatically degraded polysaccharides, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides or chemically modified mono-, oligo- or polysaccharides and wherein the derivatives of the polypeptides are hydrolytically or enzymatically degraded and polypeptides,

• the graft polymer being obtainable by radical polymerization of
• A) a monomer selected from or a monomer mixture of
• (a) acrylic acid or methacrylic acid or a mixture thereof or the alkali metal, alkaline earth metal or ammonium salts thereof, and optionally at least one of (b) and (c), where
• (b) comprises monoethylenically unsaturated monomers other than the monomers (a) and copolymerizable with the monomer (a), and where
• (c) comprises monomers having at least two ethylenically unsaturated, nonconjugated double bonds in the molecule,
• in the presence of at least one of
• B1) polysaccharides, oxidatively, hydrolytically or enzymatically degraded polysaccharides, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides, chemically modified mono-, oligo- or polysaccharides, or mixtures thereof, and
• B2) polypeptides, hydrolytically or enzymatically degraded polypeptides, or mixtures thereof the specified compounds.

A leather delimed with a graft polymer, the graft polymer comprising a graft polymer of at least one of polysaccharides, polypeptides or derivatives thereof, wherein the derivatives of polysaccharides are oxidatively, hydrolytically or enzymatically degraded polysaccharides, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides or chemically modified mono-, oligo- or polysaccharides and wherein the derivatives of the polypeptides are hydrolytically or enzymatically degraded polypeptides,

• the graft polymer being obtainable by radical polymerization of
• A) a monomer selected from or a monomer mixture of
• (a) acrylic acid or methacrylic acid or a mixture thereof or the alkali metal, alkaline earth metal or ammonium salts thereof, and at least one of (b) and (c), where
• (b) comprises monoethylenically unsaturated monomers other than the monomers (a) and copolymerizable with the monomer (a), and where
• (c) comprises monomers having at least two ethylenically unsaturated, nonconjugated double bonds in the molecule,
• in the presence of at least one of
• B1) polysaccharides, oxidatively, hydrolytically or enzymatically degraded polysaccharides, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides, chemically modified mono-, oligo- or polysaccharides, or mixtures thereof, and
• B2) polypeptides, hydrolytically or enzymatically degraded polypeptides, or mixtures thereof.