Back to results
US 4,097,234 AGranted
Method for preparing dispersion of collagen fiber
AssigneeNippi, Incorporated
InventorsTakeshi Sohde, Astuko Gotoh, Kuniharu Iwamoto, Yasushi Okamoto
Life of this patent
Estimating the term…
Abstract
A method for preparing an aqueous dispersion of collagen fibers from various materials containing insoluble collagen and various products prepared from the dispersion are disclosed.
Claims9
A method of preparing an aqueous dispersion of collagen fibers which comprises:
- (a) soaking a material including bundles of collagen fibers in an aqueous solution 0.3 to 1.0 normal with respect to NaOH, and containing 10% to 20% Na.sub.2 SO.sub.4 by weight and 0.05 to 0.3 mole per liter of an organic base until a portion of the telpeptides is removed from the collagen molecules in said bundles,
- (1) said bundles having a length greater than 5 mm when being soaked in said solution,
- (2) a length of said bundles greater than 5 mm being maintained during said soaking;
- (b) washing the soaked material with water;
- (c) grinding the washed material until said fiber bundles have a length of 5 to 70 mm;
- (d) tanning the ground fiber bundles;
- and
- (e) comminuting the tanned fiber bundles in an aqueous medium at a pH of 2.0 - 4.0 or 9.0 to 11.0 until an aqueous dispersion of collagen fibers having a length of at least 2 mm is formed.
5 more elements
Dependencies are inferred from the claim text.