An improved insoluble casein and process of producing the same / [Henry Vail Dunham].

  • Dunham, Henry Vail.
Date:
1902
Catalogue details

Licence: Public Domain Mark

Credit: An improved insoluble casein and process of producing the same / [Henry Vail Dunham]. Source: Wellcome Collection.

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    W 19,090 A.D.1902 [Under International Convention.) Dateclaimed for Patent under Patents Actt 1901 being date of first Foreign Application (in i28th Sept, 1901 United States) ) Date of Application {in the United Kingdom)^ 30th Aug., 1902 Accepted, 18th Dec., 1902 COMPLETE SPECIFICATION. An Improved Insoluble Casein and Process of Producing same I, Heniiy Yail Dunham, Chemist, of 11, Broadwaj^, in the City of New A^ork, United States of America, do hereby declare the nature of this invention and 111 what manner the same is to be performed, to be particularly described and ascertained in and by the following statement: — h As is very 'well known, many experiments have been conducted in the past 'with casein for the purpose of rendering it insoluble and of such a character that it may be used in the arts as a substitute for egg or blood albumen. Tc this end various attempts have been made to make the casein of a suitable insoluble character by the use of formaldehyde; but these attempts have not 10 been satisfactorilv successful for the reason that the casein solutions as hereto- 1/ fore treated with formaldehyde become insoluole too quickly, unless they were in a very dilute form, and in any event the resulting products were not of such a character as to be suitable for the purpose referred to. Consequently it has never heretofore been practicable to use casein solutions treated wdth 15 formaldeh^^de as substitutes for egg and blood albumen where heavy solutions 'w^ere required—, as, for example, in calico-printing and for other purposes. 1 have discovered, ho'wever, that by treating a casein solution with hexamethylene¬ tetramine and subsequently diying out the solution on a cloth or otherwise to form a thin sheet or film and then steaming the casein sheet or film at a tem- 20 perature of 180° F. or above or by subjecting it to a weak solution of hoi acids (preferably boracic acid) such casein sheet or film is rendered insoluble and the product is of such a character as to be suitable for use as a substitute for egg or blood albumen coagulated by heat, this substitute, however, being produced at very much less cost than the albumens referred to. 25 In practicing my invention or discoverj^ I take about eighty-five (85) parts of ordinary commercial casein and add thereto about fifteen (15) parts of borax or equivalent of some other metallic salt having an alkaline reaction, and the mixture is then dissolved in about four hundred (400) parts of water. To this mixture is added about fifteen (15) parts of hexamethylene-tetramine. These 80 proportions are all by weight. Any desired pigments for the purpose of coloring or inert material may be added to the resulting mixture, if desired. The solu¬ tion is then dried out in any suitable way in the form of a film or it may be dried out by pressing the mixture into the meshes of a cloth and allowing it to dry in the form of a thin sheet. When the sheet or film is dried, either 35 on a cloth or in any other manner, it is subjected to steam under a pressure [Price 8r7.]