Patent GB-181865-A (GB)
Title: Improvements in the manufacture of glue
IPC: C09H3/00
Filed: 1921-04-02
Abstract: Raw materials containing glue or gelatine are subjected to high-speed mechanical disintegration, with water and preferably a small quantity of substance rich in oxygen, in a mill, having a peripheral speed of not less than 1000 metres per minutes such as is described in Specifications 176,002, 176,003 and 179,124, [all in Class 59, Grinding, crushing, &c.].  The extraction may be carried out under a small steam pressure.  The glue solutions thus obtained are then treated, preferably in a mill as described above, with a liquid immiscible with water, such as a chlorinated hydrocarbon, a paraffin or other hydrocarbon, or mixture such as ether with acetone or alcohol.  The emulsification may be assisted by addition of small quantities of a water-soluble organic liquid. The emulsion obtained is either allowed to separate into two layers or the separation is accelerated by use of pressure, by addition of small quantities of a strong acid or salt thereof, by centrifuging or osmotic means.  One layer consists of a solution of fats &c. in the organic solvent and the other of a solution of glue in water.  The second treatment with a solvent may be repeated if necessary.  In examples finely ground fish waste, waste hide or leather, and bones are treated with water and a small quantity of potassium permanganate or of sulphur dioxide in a colloid mill and the solid impurities are removed by settling, centrifugalization, or filtration.  Ether, benzene, and trichloretheylene are mentioned as solvents for the fats, both the solvents and the fats of protein being recoverable.  The glue is obtained by ordinary boiling and drying.  Specification 156,142 also is referred to.ALSO:Raw materials containing glue or gelatine are subjected to high speed mechanical disintegration, with water and preferably a small quantity of a substance rich in oxygen, in a mill, having a peripheral speed of not less than 1,000 metres per minute such as is described in Specifications 176,002, 176,003, and 179,124, [all in Class 59, Grinding, crushing, &c.].  The extraction may be carried out under a small steam pressure.  The glue solutions thus obtained are then treated, preferably in a mill as above, with a liquid immiscible with water, such as a chlorinated hydrocarbon, a paraffin or other hydrocarbon or mixtures such as ether with acetone or alcohol.  The emulsification may be assisted by addition of small quantities of a water-soluble organic liquid. The emulsion obtained is either allowed to separate into two layers or the separation is accelerated by use of pressure, by addition of small quantities of a strong acid or salt thereof, by centrifuging or by osmotic means. One layer consists of a solution of fats &c. in the organic solvent and the other of a solution of glue in water.  In examples finely ground fish-waste, waste hide or leather, and bones are treated with water and a small quantity of potassium permanganate or of sulphur dioxide in a colloid mill and the solid impurities are removed by settling, centrifugalization or filtration.  Ether, benzene and trichlorethylene are mentioned as solvents for the fats.  Both the latter and the solvents are recoverable.  Reference is also made to Specification 156,142 [Class 2 (ii), Cellulose &c.].