656 



THE INDIA RUBBER WORLD 



1, 1920. 



M 



CHEMICAL PATENTS. 



THE UNITED STATES. 



ETHOU OF COLORING FIBROUS MATERIAL, which Comprises sub- 

 jection of the material to the action of a solution of cad- 

 mium chloride and that of a polysulphide of an alkaline earth 

 metal; finally applying a vulcanizable plastic compound. (Charles 

 H. Dennison, Wollaston, assignor to American Rubber Co., Bos- 

 ton—both in Massachusetts. United States patent No. 1,332,974.) 



Reclaiming and Regenerating Rubber Waste. The disin- 

 tegrated material is subjected to the action of a heated 

 liquid bath containing about 10 to IS per cent by weight of caustic 

 soda in water solution for approximately six to twenty hours at SO 

 to 200 pounds pressure per square inch. Subsequently the waste 

 is treated by the action of a solvent mixture comprising the fol- 

 lowing materials in the approximate proportions by weight given : 

 phenylenediamine, one part ; paraffine oil, two parts ; mineral rub- 

 ber, two parts ; rubber resin, two parts ; acetic acid, two parts ; 

 subsequently the treated material is washed and dried. (Frank 

 L. Kryder, Akron, Ohio. United States patent No. 1,340,777.) 



Can-Sealing Composition, comprising rubber dissolved in a 

 volatile solvent and china wood oil. (Theodore Cramp Wester, 

 Baltim.ore, Maryland. United States patent No. 1,341,489.) 



Sealing Composition. A plastic composition comprising a rub- 

 ber solution and gutta siak. (Theodore Cramp Wester, Balti- 

 more, Maryland. United States patent No. 1,341,490.) 



Sound Absorbing Co.'Kting. A composition of matter and arti- 

 cle of manufacture consisting of rubber and volatile spirits. 

 (Clarence H. Bryce, Glen Ridge, New Jersey, assignor to Benja- 

 min Moore & Co., Brooklyn, New York. United States patent 

 No. 1,341,704.) 



THE UNITED KINGDOM. 



Antimony Pigment Suitable for Vulcanization is produced 

 by decomposing a mixture of an antimony salt with alkali waste 

 liquor by means of an excess of sulphuric or hydrochloric acid. 

 Any proportion of the alkali waste liquor may be replaced by the 

 product obtained by boiling lime with sulphur. (E. F. Morris, 

 Holly Bank, Roby, near Liverpool, England. British patent No. 

 138.l'37. Reference is also made to Specification No. 11,827/84.) 



Vulcanizing Rubber. Natural or synthetic rubber is vul- 

 canized by the addition of salts of mono- or di-substituted dithio- 

 carbaniic acids and di- or tri-valent metals or inorganic radicals, 

 and sulphur, the amount of sulphur being reduced to 2-0.2 per 

 cent of the rubber. In an example, a mixing of 100 parts rubber, 

 OS parts sulphur, and one part paramethylene dithiocarbamate 

 of zinc, with or without the addition of mineral oxides, re- 

 claimed rubber, substitutes, and the like, is vulcanized in the 

 usual manner. (G. Bruni, Milan, Italy. British patent 140,387.) 



Vulcanizing Rubber. The substances added as described 

 in patent No. 140,387, namely, salts of mono- or di-sub- 

 stituted dithiocarbamic acids and di- or tri-valent metals or inor- 

 ganic radicals, are added to mixings containing the usual pro- 

 portion of sulphur, and the product is vulcanized at a lower 

 temperature than usual, or at the usual temperature in a shorter 

 time. In an example, a mixing of 100 parts of rubber, eight 

 parts sulphur, one part pentamethylene dithiocarbamate of zinc, 

 with or without fillers, is vulcanized in five minutes at a tem- 

 perature of 120 degrees C, or in 45 minutes at 90 degrees C, or 

 in a few days at air temperature. (G. Bruni, Milan, Italy, 

 British patent No. 140,388.) 



Composition for Filling Tires, consisting of soya bean oil 24 

 pounds, chloride of sulphur six pounds, oxide of magnesia 17'/2 

 ounces and Venetian red three ounces. The ingredients are 

 mixed and poured into a mold. When hard, the composition is 

 placed in the tire casing as a substitute for air. (F. A. Hager. 

 441 Hawthorne avenue, Portland, Oregon, U. S. A. British 

 patent No. 140,781.) 



GERMANY. 



Fu'ERiDiNE Piperidvluithiocarbamate, for use as a vulcan- 

 ization catalyst, is prepared liy the action of carbon bisulphide 

 on an aqueous solution of piperidine at a low temperature; the 

 presence of the water moderates the reaction. (Farbenfabriken, 

 formerly Friederich Bayer & Co., Leverkusen, near Koln am 

 Rhein. German patent No. 316,000, December 10, 1917.) 



Process for .-\ccelerating Vulcanization of natural or artifi- 

 cial rubber-like substances. (Stanley John Peachey, Stockport, 

 England. German patent No. 323,088. February 17, 191S.) 



LABORATORY APPARATUS. 



WICKER-WOUND WASH BOTTLES. 



NEAT AND durable wicker winding on the 

 necks of flasks used as wash bottles is 

 a welcome laboratory convenience when hot 

 liquids must he handled. Wickering can 

 also be applied to any glassware other than 

 flasks or l)ottles, as convenience may re- 

 quire. (The Will Corporation, Rochester, 

 New York.) 



THE DA VON MICRO- 

 TELESCOPE. 



A patented English instru- 

 ment for viewing objects is 

 known as the "Davon" micro- 

 telescope, shown in the illustration. The short focus 

 type permits viewing specimens at a distance of 

 from ten to 18 inches with magnification of from 

 IS to 38 diameters with large field and great depth 

 of focus. A rod with a rubber foot is attached to 

 the telescope so that the latter may be adjustably 

 rais»d or lowered to the desired distance, the rub- 

 ber foot serving as a non-slipping rest for the in- 

 strument. (F. Davidson & Co., 29 Great Portland 

 street. London, W. 1, England.) 



MERCURY SEALED ABSORPTION BULB. 



The new Fleming patent mercury-sealed ab- 

 sorption bulb is automatically sealed when not in 

 operation and has no inlet or outlet valves to turn 

 ofl^ during the course of analysis. It eliminates 

 errors because carbon dioxide or moisture will 

 not escape even when the rate of flow of oxygen 

 is as high as 600 per minute and there is no 

 danger of trapping o.xygen under pressure. The 

 use of the new bulb reduces the number of weigh- 

 ings necessary and gives the analyst all the other 

 advantages mentioned, in addition to those which 

 have made the regular Fleming hulbs popular for 

 carbon dioxide determinations by the combustion Mercury 



method. (Eimer & .\mend, 211 Third avenue. Sealed 



New York City.) Absorption 



VITREOSIL BEAKERS. 



One can evaporate, bake, and ignite in the same vitreosil 

 beaker, since the negligible expansion of vitreosil over any range 

 of temperature insures it against injury by the most severe heat- 

 ing, by quick water-cooling, or by the addition of cold acid to 

 the hot utensil. 



After evaporating an acid solution to dryness in a vitreosil 

 beaker, the residue may be baked at the highest temperature 

 available or strongly ignited over the blast lamp in the same 

 beaker, without the least danger of breakage. (The Thermal 

 Syndicate, Limited, SO East 41st street. New York City.) 



