July 1, 1921 



THE INDIA RUBBER WORLD 



741 



B. Molony, Wellesley Hills, Massachusetts, and Vasujuro Nikaido, 

 Bay City, Michigan — both in U. S. A. Canadian patent No. 



211,928. 



the united kingdom 

 Prep.xr.'KTion of India Rubber. Fresh l.\tex is treated with 

 an alkalized phenol, subsequently coagulated by addition of an 

 acid or acid salt, preferably an acidified solution of magnesium 

 sulphate. The coagulum is dehydrated mechanically. The dehy- 

 drated rubber may be softened with hot water, and then sheeted, 

 creped or rolled in cylinders. — S. C. Davidson, Sirocco Engineer- 

 ing Works, Belfast. British patent Xo. 159,602. 



Tire Tre.m) Compositiox consisting of 25 to 40 per cent 

 raw or reclaimed rubber or mixtures, and 70 to 60 per cent car- 

 borundum or a mixture of carborundum and other abrasives with 

 sufficient sulphur for vulcanizing. — J. R. Cooper, 46 Hatfield Ro.ad, 

 Birchfield, Birmingham; T. E. Lockhart, Brooklyn, Henlcy-in- 

 Arden, Warwickshire; and R. H. Osier, 36 Cannon .Street, Bir- 

 minham. British patent No. 159,608. 



Devulcanizing Waste Rubber by means of an emulsoid 

 colloid solution in water of tar, pitch resin, gum or balsam. The 

 ground rubber is boiled up with this solution, a sulphur solvent 

 yuch as turpentiiie and a deterirent alkaline solution. The boiled 

 rubber is washed and dried. — C. F. Willard, San Diego, Califor- 

 nia, U. S. A. British patent No. 159,987. 



Rubber Compositions containing lake pigments, or fillers, 

 such as saw-dust, leather waste, cork-dust, wool-waste, etc., which 

 are injured by known vulcanization processes, are vulcanized in 

 the cold by alternate treatment with sulphur dioxide and hydrogen 

 sulphide. — S. J. Peachey, 5 Yew Tree Road, Davenport Cheshire, 

 and A. Skipsey, Red Lea, Scarborough, Yorkshire. British patent 

 No. 106,499. 



Puncture-Closing Composition. .\ fluid consisting of 

 glycerine, water and Castile soap. — C. Tuckfield, 5 Thames View, 

 East Molesey, Surrey. British patent No. 160,505. 



Fire-Proofing, Water-Proofing, and Metallizing Lace, etc.. 

 is effected by immersion of the fabrics in an emulsion of an 

 aqueous solution of sodium biborate and sodium silicate, a solution 

 of rubber in naphtha and amyl acetate and metal powder. — A. 

 Norweb, 26 Fisher Gate, Nottingham. British patent No. 160,627. 

 Regenerating India Rubber. Ground vulcanized rubber 

 mixed with about 10 per cent by weight of water containing two 

 per cent of glycerine and two per cent of parafiine. The mixture 

 as heated to reaction. O. R. Bouvery, Villa St. Georges, Allee des 

 Muriers, and F. P. Conort, 19 rue de I'Orangerie — both in Algiers, 

 Africa. British patent No. 160,779. 



Self-Lubricating Composition for bearings, consisting of a 

 mixture of about 100 parts new or preferably regenerated rubber 

 devulcanized by process described in British patent No. 160,779; 

 200 parts graphite, and 90 parts sulphur or a metallic sulphide, 

 molded under pressure and vulcanized at 165 to 170 degrees C. — 

 O. R. Bouvery, Villa St. Georges, Allee des Muriers, and F. P. 

 Conort, 19 rue de I'Orangerie — botli in Algiers, Africa. British 

 patent No. 160,780. 



Retreading Tires. The treads of worn tires are exposed to 

 a flame to desulphurize the rubber and render it sticky. A cement 

 of rubber in carbon tetrachloride containing a small amount of 

 sulphur is spread over the surface, and when this is dry a new 

 tread is applied. The tire is then vulcanized as usual. — E. Nestler, 

 Bergenfield, New Jersey, U. S. A. British patent No. 160,805. 



Rubber Paint consisting of rubber added to dissolved As- 

 phalt and olcates or stearates of metals and vulcanized by means 

 of sulphur or suitable sulphur compound and heat. — C. H, Ivinson, 

 72 Coombe Lane, Wimbledon, and G. S. Roberts, 74 Earls Court 

 Road, Kensington, both in London. British patent No. 161,201. 



part of their oxygen at the temperature of vulcanization, together 

 with aliphatic or aromatic amines or ammonia compounds or their 

 derivatives or salts. For example, antimony pentoxide, lead oxide, 

 or lead peroxide may be added, together with diethylamine or ani- 

 line sulphate. — Farbcnfabriken formerly Friedrich Bayer & Co., 

 Leverkiisen near Koln-on-Rhein. German patent No. 328,610 

 February 20, 1917. 



LABORATORY APPARATUS 



ELECTRICALLY-HEATED WATER-BATH 



THE illustration shows the exterior view of a new electrically 

 heated water-bath for laboratory use. The apparatus has a 



heavy copper tank, tinned on the inside with heavy asbestos 



outer covering. 

 The constant tem- 

 perature regulation 

 is by means of a 

 bi-metallic regula- 

 tor giving a tem- 

 perature control to 

 about one degree 

 C. The temper- 

 ature range, with- 

 out cover, is from 

 that of the room 

 to about 65 de- 

 grees C. ; with 

 cover, from room 

 temperature t o 

 about 100 degrees 



C— The Thermo Electric Instrument Co., Newark, New Jersey. 



Small Electric Water-Bath. 



LATEX AND RUBBER FROM INDIVIDUAL TREES' 



The results given in this preliminary communication indicate 

 that on different dates the same tree gives latex which is approx- 

 imately the same in amount and in rubber content and which, 

 when suitably treated, yields rubber showing approximately the 

 same viscosity and vulcanizing properties (tensile strength, time 

 of cure, slope). Different trees are found to show considerable 

 differences in the properties of the latex and rubber which they 

 yield. Among the 21 trees for which data are given the daily 

 yield varies from 4 to 71 grams, the rubber content of the latex 

 from 17 to SO per cent, the viscosity from 14 to 90, and the time 

 of cure from 90 to 160 minutes. 



»0. de Vrics, Archief voor de Riibber-cultuur, 4, 1920, 249,271. 



ACTION OF SULPHURIC ACID ON CAOUTCHOUC 

 Cold concentrated sulphuric acid converts raw rubber immedi- 

 ately into a hard, brittle mass which after several days becomes 

 soft again. The action is accompanied by the evolution of sul- 

 phur dioxide, and the soft product becomes hard again when 

 treated with water. Benzene solutions of raw rubber, gutta 

 percha, and artificial dimethyl-caoutchouc H, yield white solid 

 substances which may be powdered and constitute oxidation prod- 

 ucts of the rubber. The action of sulphuric acid and the nature 

 of the product are controlled by the nature of the solvent, by 

 the quantity and particularly by the duration of the action of the 

 acid, and by the concentration and nature of the rubber. 



'F. Kirchhof. Kolloid Zei'schrift, 1920, 27, 311-315. 



ii germany 



Vulcanized products of cre.^t strength and extensibility 

 are obtained by adding to the materials to be vulcanized metallic 

 oxides or peroxides or organic or inorganic compounds which yield 



ACCELERATOR PATENTS 



In response to numerous requests there appears elsewhere in 

 this issue of The India Rubber World a list of .i^merican 

 and foreign patents on vulcanization accelerators. This list 

 has l>een brought up to date and may be accepted as covering 

 all the materials so far patented as vulcatiization accelerators. 



