JCNE 1. 1921 



THE INDIA RUBBER WORLD 



661 



Walter O. Snclling, Allentoun. l\'iinsylvania. United States pat- 

 ents No. 1.376,172 and No. 1,376,173. 



\'ri.c.A.vizED Oil Product. A liquid vulc.\xized oil product 

 capable ot being transformed into a solid factice-like material on 

 contact with water. — Walter O. Snelling. .-Mlentown, Pennsyl- 

 vania. United States patent No. 1,376,174. 



THE UNITED KINGDOM 



.\cceleraturs for Vulcanizing RuiiBtR. Furfur.\mide and 

 other nitrogen derivatives of furfuryl are used as accelerators. 

 Several furfuryl derivatives are mentioned, in particular the con- 

 densation products of pyromucic aldehyde with ammonia or 

 animes. — British patent No. 157,050. (Not yet accepted.) 



Insulating Compositioxs. Cellulose derivatives, particu- 

 larly esters, such as nitro-cellulose, acetyl cellulose, and viscose, 

 and ethers are mi.xed with non-hygroscopic, liquid or plastic in- 

 sulating substances such as waxes, oils, fats, resins, gutta percha, 

 etc., with or without bitumen and filling ingredients. Castor oil, 

 either treated with hydrogen or not, is stated to be a suitable in- 

 sulating ingredient. — Sicmcns-Schuckertwerke, Siemensstadt, near 

 Berlin, Germany, iiriti.sh patent N'o. 157,120. (Not yet accepted.) 



India Ribber Composition for soles and heels, packing for 

 steam and water joints consists of rubber SO parts; . sulphur 10 

 parts ; disintegrated waste fabrics coated with non-vulcanized 

 rubber 39 parts ; and an accelerator such as para-nitroso-dimethyl- 

 aniline one part. This mi.xture is calendered and vulcanized un- 

 der pressure for one hour at 149 degrees C. — India-Rubber, Gutta 

 Percha & Telegraph Works Co., Limited, 31 rue de la Boetie, 

 Paris. British patent No. 157,821. (Not yet accepted.) 



Rubber Substitutes made by heating sulphur and any ani- 

 mal or vegetable lixed oil. in a closed vessel until the reaction is 

 completed. The mixture is also agitated, and zinc oxide, litharge, 

 magnesia, or other catalyst or accelerator is employed. — Western 

 Ru1)ber Co.. Washington, assignee of H. H. Hazeltine and M. 

 Gregory, Tacoma, Washington, U. S. A. British patent No. 157,836. 

 (Not yet accepted.) 



Coagulating L.\tex. Latex is sprayed in a current of a 

 drying medium which may be heated to 200 degrees F., to obtain 

 a product containing all the solid constituents of tiie latex. Prema- 

 ture coagulation is prevented by the addition of ammonia or the 

 like. X'ulcanizing agents as sulphur, nitro-coir.pounds, sulplnir 

 compounds, and fillers, namely, carbon black, zinc oxide, etc., may 

 be added to the latex or may be introduced into the spraying 

 chamber with the latex. When additions are made to the latex, 

 the preservative added is preferably saponin, glycerine or glue 

 in the proportion of about 0.1 per cent. The mixing thus ob- 

 tained is more homogeneous, does not require drying, mastication 

 is rendered unnecessary, and after vulcanization by the usual 

 methods, a product of greater tensile strength is obtained. — E. 

 Hopkinson, 1790 Broadway, New York, U. S. A. British patent 

 No. 157,975. (Not yet accepted.) 



Coating for Balloon Fabrics consisting of Turkish bird- 

 iinie dried at ISO degrees F. and coated with shellac, varnish or 

 rubber solution. Mercuric chloride is added to the birdlime as a 

 preservative. — C. .A. Cleghorn, Hrackenside. Woburn Sands. Bed- 

 fordshire. British patent No. 158,366. 



Devulcanizing. Finely divided rubber is impregn.vted with 

 cold solution of alkali, and heated in a closed vessel to about 338 

 degrees F. The product may be further treated with hydrochloric 

 acid and washed. — J. Smith, 12 Terregles .Avenue, PoUokshields, 

 Glasgow. British patent No. 158,783. 



Non-inflammable Composition of Rubber. Hydrated Oxide 

 of aluminum, litharge, and sulphur, with or without asbestos (see 

 patent No. 125.622), is used by itself in slieets. blocks, tubes, etc. — 

 W. H. Perkin. Oxford University, and J. H. Mandleberg and 

 Mandleberg & Co., Limited, .\lbion Waterproofing Works, Pen- 

 dleton. Manchester. British patent No. 159,014. 



N 



O. 32 



326,819 



336,146 

 336,476 



OTHER CHEMICAL PATENTS 



GERMANY 



PATENTS ISSUED WITH DATES OF ISSUE 



6,541 (October 10, I9I8.) \'ulc.nriization of rubber on metals. 

 A layer of adhesive, viscous material, which is not absorbed 

 In- rubber, is interposed between the rubber and tlie metal. 

 The intermediate and by-products obtained in the manufacture 

 of synthetic rubber are suitable for the purpose, l-'elten and 

 Guilleaumc. C'arlswerk, A.-G. 



(February 20, 1917.) Vulcanized rubber products of great 

 strength and extensibility are obtained by using antimony 

 rtntoxide in the mixture: the lesult is a red product of 

 greater softness, elasticity and toughness than those obtained 

 with Roldcn antimony. Farbenfabrilicn formerly Friedrick 

 Bayer & Co.. Leverkusen, near Coiogne-on-the-Rhinc. 



(July 25, 1919.) Method of separating rubber from criidt 

 rr vulcanized waistc rubber. Peter Friesanhahn, Ilubertu. 

 sallee -U. Htrlin-Ciriiiiewald. 



(February 15, 1918.) Plastic masses. Farbenfabriken formerly 

 Friedrich Jiayer & Co., Leverkitsen, near Colofine-on-thc 

 Rhine. 



LABORATORY APPARATUS 



CONSTANT TEMPERATURE WATER BATH 



THE demand for a water l)ath electrically heated and provided 

 with a constant temperature control that is sufficiently sensi- 

 tive for the general laboratory has led to the design and manu- 

 facture of the apparatus illus- 

 trated. 



The range of constancy in the 

 temperature of this water bath 

 is one degree C, which is suf- 

 ficiently close for general ana- 

 lytical work. The regulator 

 may be set to produce and 

 maintain any temperature be- 

 tween a few degrees above 

 room temperature and the boil- 

 ing poiEt of water. Dishes of 

 any form may be used with 

 this apparatus. A support is 

 provided to hold condensers, 

 thermometers, etc. The area 

 of the bath is 13 by 13 inches 

 and the top is provided with 

 four holes, each five inches in 

 diameter and provided with 

 concentric rings. It is made 

 for 110-volt and 220-volt cur- 

 rents and may be used on either 

 alternating or direct current. Sargent's Electric Water B.\th 

 It is equipped with an attachment for maintaining a constant 

 water level in the bath and with cord and plug for attaching to 

 the "lectric line. — E. H. Sargent & Co.. Chicago, Illinois. 



"DKEADNAtlGHT"' ToRCH 



LABORATORY GASOLINE TORCH 



.A gasoline torch is frequently useful in 

 the rubber laboratory for many purposes. 

 The illustration shows a new and greatly 

 improved torch of this sort known as the 

 "Dreadnaught." Among the features 

 claimed, which give it pre-eminence, are 

 these — it gives the hottest fire, withstands 

 the hardest knocks, is quick-starting, dur- 

 able and non-leaking. — P. Wall Manufac- 

 turing Supply Co., Pittsburgh, Pennsylvania. 



RUBBER MICRO-FUNGUS 

 The purer and inore elastic grades of vulcanized rubbers when 

 exposed to moist air are liable to develop growths of micro-fungus 

 which to the naked eye often reseinble dust. The fungus threads 

 penetrate the surface rubber and may cause disintegration. Rub- 

 ber thus injured wrinkles curiously and may become very weak. — 

 J. Scott, Tlic liuli,! Rubber Journal, London, 1920, 60, 410-412. 



