February 1, 1916.1 



THE INDIA RUBBER WORLiD 



225 



CHEMICAL TREATMENT OF RUBBER. 



THE UNITED STATES. 



Vulcanizing Rubber-like .Materials, 1,160,777. Paul I. Mur- 

 rill, assignor to Revere Rubber Co. Rubber or rubber-like ma- 

 terials are cold cured by subjection to the action o£ sulphur 

 monochloride and gasolene characterized by the absence of olefins. 



Revulcanizing Rubber, 1,166,784. Raymond B. Price, assignor 

 to Rubber Regenerating Co. The process consists of exhausting, 

 heating, and compressing the finely divided material and com- 

 pressing it under excessive compacting pressure to minimize de- 

 structive distillation, then subjecting it to vulcanizing heat, and 

 finally quickly cooling it to check surface vulcanization. 



D«;vuLCANiziNC Rubber, 1,167,359. Henry J. Mayers, assignor 

 to the Empire Rubber Co. The process consists in subjecting the 

 vulcanized rubber to the action of a bath containing de-resinated 

 and de-turpenated oil of pine. 



Manufacture of Froth Fillings. 1,167,518. Fritz Pfleumer. 

 The process comprises the steps of vulcanizing rubber material 

 under 3 hot high gas pressure, then cooling it under a gas pres- 

 .sure at least equal to that applied during vulcanization, inserting 

 the cooled filling into a casing, and then heating the filled casing 

 to expand the filling until it occupies the interior of the casing. 

 .■\n illustrated article on the material produced by this proce.ss 

 will be found in The India Rubber World, August, 1915, page 

 610. 



Manufacture OF IsoPRENE and HoMOLOGUES. 1,168,070. Henry 

 S. A. Holt, assignor to Badische Anilin & Soda Fabrik. The 

 process of producing butadiene hydrocarbons by heating in the 

 vaporized condition while in a state of dilution and in the practi- 

 cal absence of other organic hydrocarbons, the mixture of poly- 

 merized products other than caoutchouc-like matter resulting in 

 the polymerization of butadiene hydrocarbons. 



Reclaiming Waste Rubber. 1,168,230. Gray Staunton. — 

 Finely ground vulcanized waste rubber is mixed with about 25 

 per cent, of alkaline carbonate. This dry mixture is heated in an 

 oven for two or three hours at 300 degrees F. The material is 

 then washed to remove excess of alkali. 



THE GERMAN EMPIRE. 



Hard Rubber Substitute. 289.597(1915). Hans RKicher and 

 Ernest Krause. B\- the process yeast is converted into a horn- 

 like substitute for hard rubber by the action of formaldehyde 

 with or without the addition of other substances. 



THE SWISS REPUBLIC. 



Preparation of Fabrics for Rubberizing, 68,858. W. E. Munt/, 

 London, England. Fabrics are impregnated with alkaline salts. 

 sodium carbonate and borax, or with basic metallic salts or basic 

 hydroxides which unite with the sulphurous product of vulcaniza- 

 tion and prevent injurious effect on the fabric. 



Producing Benzol from Mineral Oil, 69,342. Continental 

 Caoutchouc & Gutta-Percha Co., Hanover, Germany. Mineral oil 

 is subjected to the action of a halogen-aluminum hydrocarbon as 

 a catalyzer. It is claimed that the process has important advan- 

 tages over the cracking process, since it does not require to be 

 operated under pressure; in fact, can be conducted in a vacuum, 

 the l)enz<jl obtained being free from disagreeable odor. 



LABORATORY APPARATUS. 



A CONSTANT LEVEL FILTER RESERVOIR. 



T~'HE ccnstant level filter reservoir here figured possesses the 

 ■*• advantage of being easily constructed from materials at 

 hand in every laboratory. The principle involved is old, 

 but its application in the present way is believed to be new. 

 The method of constructing, due to R. R. Turner, is evident 

 from the diagram to the left. .\ny size of flask or bottle 



LABORATORY APPARATUS PATENTS. 



THE UNITED STATES. 



ISSUED DECE.MHER 14. 1915. 



1,163.830. Repeated stress testing machine. J. B. Komtners, Madison, Wis, 



ISSUED DECEMBER 28. 1915. 

 1,166.266. .Xttachment for fabric tensile strength testers. S. N. Senna, 

 assignor of one-half to C. E. Torrance— both of Holyoke. 

 Mass. 



THE GERMAN EMPIRE. 

 P.\TEXT ISSUED (With Date of Validity!. 

 289.543 rDecember 31. 1913). Viscosimetcr. New York-Hamburg Rubber 

 Goods Co., Hamburg. 



may be used. The straight tube a may be slipped up or down 

 in the stopper, the position of its lower end regulating the 

 level of the liquid in the filter. To start the flow it is only 

 necessary to blow into the tube a. 



A special convenience of this device lies in the possibility 

 of making precipitations in the same vessel which is later 

 used as a filter reservoir, thus avoiding a transfer. For 

 precipitations by gases the apparatus, as shown at the right, 

 may be arranged by disconnecting tube c and substituting 

 d for (I. 



SULPHURETTED HYDROGEN GENERATOR. 



.^ convenient generator for sulphur- 

 etted hydrogen has been devised by R. 

 Boiling. This apparatus is made from an 

 18-inch calcium chloride jar and an 8-ounce 

 separatory funnel. The bottom of the jar 

 is filled with flint pebbles, and over this 

 is placed a charge of about 5 pounds of stick 

 iron sulphide. The separatory funnel is 

 filled with sulphuric acid, diluted one to 

 seven, and opened so as to get the desired 

 pressure ; the stopper on top is kept tightly 

 closed. The acid enters the tower in drops 

 and emerges at the bottom com- 

 pletely spent. The generator, which 

 is made from common laboratory ap- 

 paratus, is in complete control at 

 all times. No acid is wasted ; there is no clogging of sulphide. 



MODIFIED PIPETTE. 



The accompanying sketch shows a very useful 

 form of pipette suggested by Sidney Born. It is 

 made by fusing a stopcock and a piece of bent 

 glass tubing to a pipette. The advantages over 

 the ordinary pipette are: 



1. Safety — there is no danger of sucking up 

 acid or dangerous liquids. 



2. Ease of manipulation — the stopcock insures 

 tighter closing and greater accuracy than use of 

 a finger. 



3. .\ccuracy — the line of demarcation is 1 

 with the eye when using. 



4. The pipette can be carried around full without losing 

 any liquid. 



