i,48 



THE INDIA RUBBER WORLD 



[September 1, 1913. 



The lampblack affords protection from the injurious effects of 



light and the ceresin increases the effective resistance to oxi- 



tensile strength and elasticity and minimizes 



surface ahrasion. 



Treatment of Latex for Extraction of Rubber. — United 

 States patent No. 1,145,351, Samuel C. Davidson. The inventor's 



to eliminate the "resinous, protein, gummy and oily 

 constituents of the latex" from the coagulated rubber and bring 

 into intimate mixture with the latter precipitated sulphur from 

 solution of a sodium or potassium thiosulphate by the addition 

 .ii dilute acid. 



United States patent N T o. 1.146,851, Samuel C. Davidson. In 

 addition to sulphur precipitated from alkaline polysulphides the 

 inventor adds to the latex "alkalized cresol" as a preservative. 



Production of Caoutchouc from Isoprene. — United States 

 patent, 1. 140,253, Arthur Heinmann. The process consists of 

 first passing a substantial amount of free ozone through isoprene 

 while maintaining the latter at a low temperature, and then 

 beating the product to a temperature of approximately 105 de- 

 grees C. for a time sufficient to effect polymerization. 



Patented Rubber Substitute. — E. Serre, French patent Xo. 

 474.220 (1913). In the preparation of a cblorosulphide rubber 

 substitute the oil undergoing treatment with sulphur mono- 

 chloride is mixed with a "moderator" the function of which is 

 to reduce any dichloride present, and absorb any excess of mono- 

 chloride remaining after the reaction and compensate by the dila- 

 tation of one of its constituents (retene), the contraction of the 

 mass on solidification : 820 parts by weight of cottonseed oil is 

 mixed with 20 parts of "moderator," consisting of flowers of 

 sulphur. 1; sylvestrene or pinene, 2; cottonseed oil. 12; a retene, 

 5 parts; and vulcanized with 160 parts of sulphur chloride. The 

 product is adapted for filling motor tires. 



Treatment of Rubber Latex. — A. Woosman, English patent 

 Xo. 6,215 (1914). Smoke from a furnace is passed into a cham- 

 ber, in which is an open pan containing latex, and is distributed 

 li\ a baffle within the pan. A horizontal cylindrical drum, pro- 

 vided with perforations and grooves, rotates and churns the latex 

 with the smoke. 



Regenerating Rubber. — C. E. Anquetil. French patent No. 

 473.787 (1913). Vulcanized rubber waste is saturated with a 

 chlorine derivative of ethylene or methylene, such as tri- 

 chloroethylene, either by exposure to its vapor in a chamber 

 heated to 60 degrees C, or by immersion in the liquid for not 

 longer than 2 hours. The mass becomes very friable under this 

 treatment, and can readily be freed from impurities by crushing 

 and passing it through a sieve. The portion passing the sieve is 

 dissolved by one of the usual solvents and the rubber precipitated 

 by pouring the solution into a mixture of alcohol and acetone. 

 Tlie process of solution can be carried out in less than 2 hours. 



Synthetic Rubber Manufacture. — A. Haas, French patent 

 Xo. 473,971 ( 1913). Starchy material is heated in a hermetically 

 closed vessel with about 1 per cent, of rubber latex at 40 degrees 

 C. for several days. The fermented product is transferred by 

 means of air pressure into a second vessel containing a mixture of 

 tetrachloroethane (2 parts) and trichloroethylene (1 part). By 

 means of a steam coil the temperature is raised to 80 degrees C, 

 and under this treatment the mass becomes completely anhydrous. 

 By the pressure of the gases generated in the second vessel the 

 fluid mass passes by a pipe into a third vessel, containing a solid 

 hydrocarbon (such as camphor or its substitutes) to the amount 

 of 4 per cent, of the original starchy material. The product is 

 finally drawn off from the third vessel and freed from solvents 

 by distillation. The residue is said to "posses- all the properties 

 of rubber." 



GUI stion of Latex. — R. C. Fulton and D. A. MacCullum. 

 Ii patent Xo. 9,066 (l f '14). Rubber latex is coagulated and 

 cured by treatment with aldehydes or ketones other than formal- 

 dehyde in an inert carrier or diluent such as water, but exclud- 

 ing alcohol. For example 80-90 parts of water are added to 



10-20 parts of aldehyde or ketone, and this diluted solution may 

 be used with about half its volume of latex, which is preferably 

 poured or sprayed over the coagulant. Formation to the extent 

 of one per cent, may be added to the latex before coagulation. 



Insulating Varnish. — Carl Baeder, United States patent 

 No. 1.149,171. A composition comprising a resinous base, lin- 

 seed oil, rubber, sulphur, acetate of lead and an oxygen com 

 pound of manganese yielding a dry residuum with low electrical 

 conductivity, great flexibility and low degree of brittleness. [The 

 inventor has evidently overlooked the deleterious effect of man- 

 ganese compounds on rubber.] 



Process for Making Caoutchouc Substance. — Kurt Gottlol... 

 United States patent Xo. 1,149,577. This consists of twenty-four 

 claims, the gist of which is the process of producing a caoutchouc 

 substance by polymerizing isoprene or a butadiene hydrocarbon in 

 a dilute aqueous solution of egg albumen, emulsifying the mixture 

 during polymerization and finally separating the caoutchouc sub- 

 stance. 



Caoutchouc Substance and Vulcanization Product. — Fritz 

 Hofmann and Kurt Gottlob, United States patent Xo. 1,149,580. 

 The process of producing vulcanized rubber by incorporating 

 with rubber a small amount of an ammonium compound having a 

 dissociation constant than 1 x 10 s , and having a basic re- 

 action at the vulcanizing temperature, and heating this mixture 

 with a vulcanizing agent to effect vulcanization. Aldehyde and 

 acetaldehyde ammonium compounds are referred to. 



process for making solid plastic substances of glycerine 

 and gelatine. 



Solid plastic substances, such as are used for covering printers' 

 rollers are made by melting together various combinations of 

 glycerine, gelatines, coal tar, vegetable tar, wood pitch, resin, 

 turpentine or rubber mixed with sulphur and camphor, together 

 with some hardening agent like formaldehyde. A new German 

 patent provides for replacing the camphor, which is an expensive- 

 addition, by aliphatic and aromatic acid esters, such as vinegar, 

 benzo acid ester, and the like, or by acid ester oxides, such as 

 sour milk, salicylic acid ester; sulphur also to be used as well as 

 formaldehyde. The compound is passed through a calender and 

 vulcanized for 30 minutes at 238 degrees F. [German patent 

 No. 284,708 (1911), Julius Stockhausen.] 



NATIONAL EXPOSITION OF CHEMICAL INDUSTRIES. 



President Wilson has been invited to open the Xational Ex- 

 position of Chemical Industries on Monday, September 20. at the 

 Grand Central Palace, Xew York City. This exposition will be 

 an important event in the history of the industries dependent on. 

 chemistry, and can not fail to be far reaching in its results. 

 Elaborate exhibits are arranged, many as working units showing 

 the processes or apparatus in actual work. 



Among the organizations co-operating to make this exposition- 

 a success are the American Chemical Society, the American 

 Electrochemical Society, the Amerian Institute of Mining Engi- 

 neers, the Amerian Institute of Electrical Engineers, American 

 Pulp and Paper Associations, Technical Section, and the Bureau 

 of Economics. 



The program of meetings and papers is one of unusual in- 

 terest. Important papers will be presented on scientific, industrial 

 and trade topics. A great variety of moving pictures will be 

 shown daily, illustrating a wide range of manufacture — chemical, 

 electrical and metallurgical. 



Eight bureaus in the Department of Commerce, Interior ami 

 Agriculture will present noteworthy and instructive exhibits. A 

 few exhibitors of special interest to the rubber trade are the 

 American Hard Rubber Co., the Automatic Weighing Machine 

 Co., the Buffalo Foundry & Machine Co., the Boonton Rubber 

 Co.. the Condensite Co. of America, the J. P. Devine Co., Eimer 

 & Amend and the General Bakelite Co. 



