820 



THE INDIA RUBBER WORLD 



August 1, 1921 



phenol or pheiioloid, the emiiluymeiit of a coagulating liuid con- 

 sisting of an acidified aqueous solution of a soluble salt of mag- 

 nesium for effecting the coagulative separation of the raw rubber. 

 — Samuel Cleland Davidson, Belfast, Ireland. United States 

 patent Xo. 1,381,455. 



the united kingdom 



India Rubber Compositions. Stiff air-dried clue containing 

 5 to 15 per cent of water is incorporated with unworked rubber 

 in a mixing machine, the action of which produces sufficient heat 

 to render the materials a plastic and homogeneous mixture. 

 Preferably the temperature is allowed to rise to 280 degrees F. 

 to evaporate much of the contained water and permit vulcaniza- 

 tion of the product without further drying. — H. Wade, 111 Hatton 

 Garden, London (The Goodyear Tire & Rubber Co., Akron, 

 Ohio.) British patent No. 161,482. 



India Rubber Compositions. Finely divided solids, such as 

 carbon black or zinc oxide, which are added to rubber as pigments 

 or fillers, are first mixed with a solution of glue or other colloid, 

 which has been emulsified by means of a volatile liquid such as 

 benzol or toluene. The emulsion is then mixed with the rubber, 

 and the volatile liquid is removed during the subsequent drying 

 process. — H. Wade, 111 Hatton Garden, London (The Goodyear 

 Tire & Rubber Co., Akron, Ohio.) British patent No. 161,483. 



Heating India Rubber. In the heat treatment of rubber 

 for reforming or vulcanizing, a solution is employed having its 

 boiling point at or slightly above the temperature required, the 

 solution being at or slightly below the boiling point. Solutions of 

 calcium chloride of various strengths are preferred, the boiling 

 points of which rise approximately ten degrees F. for every half- 

 pound of salt to lYz pints of water. Articles or molds containing 

 them may be immersed directly in the liquid, or placed in a 

 jacketed vessel, the jacket of which contains the solution directly 

 heated or circulated from an outside heater. — H. Gare, care of 

 Grove Rubber Co., Limited, Bramallmoor Lane, Hazel Grove, 

 Stockport, Cheshire. British patent No. 161,648. 



Spongy India Rubber. The process of manufacturing po- 

 rous or expanded rubber by vulcanization in an inert gas under 

 pressure.— C. L. Marshall, Dunoon, Doyle Gardens, Harlesden, 

 London. British patent No. 162,176. 



Vulcanizing India Rubber. The cold vulcanization process 

 described in patent No. 129,826 is modified by the application of 

 one or both of the gases used at a pressure greater than that of 

 the atmosphere. — S. J. Peachey, 5 Yew Tree Road, Davenport, 

 near Stockport, Cheshire. British patent No. 162,429. 



N 



OTHER CHEMICAL PATENTS 



GERMANY 



PATENTS ISStTED, WITH DATES OF ISSUE 



0. 338,295 (September 2, 1919.) Process of regenerating rubber. 

 Xylos Rubber Company, Limited, Manchester, England, reprc. 

 scnted by Dr. W. Karsten and Dr. C. Wicgand, patent lawyers 

 Berlin S. W. 11. 



477,054 

 477,275 



477,956 



503,975 

 504,179 

 505,701 



506,281 

 506,868 

 510,187 

 510,197 

 510,875 



FRANCE 



PATENTS ISSTTED, WITH DATES OF ISSUE 



(May 22, 1914.) Elastic mass. F. Aichlburg. 



(July 28, 1914.) Process of manufacturing solid plastic masses. 

 H, Hagendorf and A. Breslauer. 



(July 9. 1919.) Process of producing diolefines (isoprene) from 

 rubber, bodies containing rubber, homologs and analogs of 

 rubber, as well as from mixtures of rubber and from vulcan- 

 ized products with a base of rubber. H. Stern 



(December 22 1917.) Process of making halogcncd hvdrines. 

 T. and E. H. Kerfoot. 



(September 24, 1919.) Improvements in the manufacture of 

 acetic acid. The Shawinig.m Water & Power Co. 



(August 27, 1918.) Process for accelerating the vulcanization 

 of rubber and similar substances. Compagnie Parisienne des 

 tissus caoutchouc et simili-cuir. " 



(January 31, 1918.) Continuous process of manufacturing ac- 

 tone. R. P. T. Duchemin. 



(December 2, 1919.) Method of treating rubber. The Hunter 

 Dry Kiln Co. 



(July 11, 1919.) Improvements in the method of vulcanizing 

 rubber. E. Tilche. 



(July. 18, 1919.) Improved process of vulcanizing rubber. E. 

 Tilche. 



(Febr-jary 28, 1920.) Leather and imitation leather, issued for 

 footwear coverings for floors, belting, tires, etc. Hie Patent 

 Wear-proof Rubber, Leather & Fabric Co., Ltd. 



LABORATORY APPARATUS 



LABORATORY GAS BURNERS 



■ I 'he burner shown in tlie illustration is one of several forms 

 ^ made for laboratory use. It is a heating burner, without stand 

 concerning which the makers state 

 that it will give more heat with 

 less gas than any other burner, 

 due to perfect combustion. The 

 air and gas are regulated at one 

 time by a patent air mixer which 

 assures economical gas consump- 

 tion. 



There is complete control of the 

 length and color of the flame and 

 no clogging or flashing back. 

 Also, it holds a low flame in any 

 draft and burns at any angle, 



using all kinds of gas at any The Tirkiix Burner 



pressure. — Tirrill Gas Machine 

 Lighting Co., SO Church street. New York, K. Y. 



PAPER FILTER CONES 



Perforated paper cones to protect filter papers are made by fold- 

 ing in the ordinary way a 5.5 cm. "hardened" filter paper and 

 punching eight or more small holes about 2 mm. in diameter. 

 After the cone is opened out it is fitted to the funnel, together 

 with the main filter paper, by wetting and pressing firmly with 

 the fingers. Some of its advantages are ; 



(1) Negligible cost, especially as compared with platinum. (2) 

 Perfect fit, due to the fact that it can be molded while wet to fit 

 each particular funnel. (3) No sharp edges to cut the overlying 

 paper. (4) Unaffected by acids or other reagents for which filter 

 papers can be used. 



Aside from these distinct advantages some other points should 

 be mentioned. If the cones are pecmitted to dry out after using 

 (a convenient way is to leave them standing in the funnels) they 

 retain their shape and can be used over again repeatedly. The 

 strength of the cones is sufficient to withstand any ordinary 

 vacuum used for filtering in the laboratory.— Seth S. Walker in 

 Tlic Chcmist-Anah'St. 



THE NATIONAL CHEMICAL EXPOSITION 



Extensive preparations are being made for the coming National 

 Chemical Exposition, and it is predicted that this seventh annual 

 exhibit will be a most important one, where many new phases 

 of chemical development will be represented. 



The show will be held in the Eighth Coast Artillery Armory, 

 New York, N. Y., during the week of September 12. One of 

 the important features of this exposition will be the fact that 

 all the exhibits will be on one floor, while another great im- 

 proveinent over preceding gatherings of the kind is the securing 

 of an auditorium with a capacity for seating 1,400 people. 



Among the exhibits will be a silent chain drive displayed by 

 the Morse Chain Co. This firm will also exhibit a number of 

 samples of chains of dififerent sizes, in order to illustrate the 

 Morse rocker joint. By means of these displays the advantages to 

 be derived from the use of this company's silent chain drives will 

 be ingeniously advertised. 



The program, as far as planned, will include the following ad- 

 dresses, of especial interest to the rubber industry: 



"The Relation of Atmospheric Conditions to Chemical 

 Processes," by A. E. Stacey, Jr., of the Carrier Engineering Cor- 

 poration; "Drying and Drying Problems," by H. S. Landell, of 

 the firm of Proctor & Schwartz ; and an address, the title not 

 yet stated, by E. G. Rippel, of the Buffalo Foundry & Machine Co. 



