Patent GB-957783-A (GB)
Title: Improvements in or relating to the preparation of collagen fibres
IPC: D01C3/00
Filed: 1960-10-13
Abstract: A collagen fibre material may be made by preparing collagen fibres by (a) subjecting collagen fibres of a hide or other skin material to the chemical action of an aldehyde in an aqueous bath in which the aldehyde is present in an amount by weight of 1/4 to 1% based on the weight of water, the treatment being continued until the material contains a chemically combined aldehyde content of from 0.15 to 1.0% based on the dry weight of the material, (b) adjusting, if necessary, the pH of the resulting mass to bring it within the range of from 5 to 8, (c) subjecting the mass in an aqueous dispersion bath to a shearing force between relatively moving surfaces to tease the material into fibres and disperse the fibres in the water, (d) adjusting, if necessary, the pH of the mass to bring it within the range of from 4 to 5.5 and (3) removing at least part of the water from the dispersion. The aldehyde may be formaldehyde or glutaraldehyde.  The pH of the aqueous bath during the aldehyde treatment is maintained within the range of 5 to 9.5. The skin solids content of the mass in the aqueous dispersion bath may be from 1 to 8% by weight. A surface active agent may be added to the dispersion after subjecting the material to the shearing action. After subjecting the material to the shearing action, the collagen fibres may be separated from bumps of material in the dispersion by air festation and are redispersed in water. The dispersion of collagen fibres may be brought in step (d) to a pH within the range of 4.8 to 5.3. The product may be mixed with collagen solution, from which collagen fibres are subsequently precipitated, in the manufacture of sheet material. The collagen fibres may be dried and opened, and may be used to make filters for tobacco smoke. Specifications 914,123 and 927,282 are referred to.ALSO:Sheet material is produced by mixing collagen solution, from which collagen fibres are subsequently precipitated, with a collagen fibre material produced by (a) subjecting collagen fibres of a hide or other skin material to the chemical action of an aldehyde in an aqueous bath in which the aldehyde is present in an amount by weight of 1/4 to 1% based on the weight of water, the treatment being continued until the material contains a chemically combined aldehyde content of from 0.15 to 1.0% based on the dry weight of the material, (b) adjusting, if necessary the pH of the resulting mass to bring it within the range of from 5 to 8, (c) subjecting the mass in an aqueous dispersion both to a shearing force between relatively moving surfaces to tease the material into fibres and disperse the fibres in the water, (d) adjusting, if necessary, the pH of the mass to bring it within the range of from 4 to 5.5 and (e) removing at least part of the water from the dispersion.  The aldehyde may be formaldehyde or glutaraldehyde.  The pH of the aqueous both during the aldehyde treatment is maintained within the range of 5 to 9.5.  The skin solids content of the mass in the aqueous dispersion may be from 1 to 8% by weight.  A surface active agent may be added to the dispersion after subjecting the material to the shearing action. After subjecting the material to the shearing action, the collagen fibres may be separated from lumps of material in the dispersion by air floatation and are redispersed in water.  The dispersion of collagen fibres in step (d) may be brought to a pH within the range of 4.8 to 5.3.  Specifications 914,123 and 927,282 are referred to.