306 



THE INDIA RUBBER WORLD 



IMARni 1. 1919. 



consists of treating tlie fabric witli an emulsionized lubricant 

 produced by a basic emulsifying agent adapted to produce a 

 capillary impregnation of the fabric, evaporating the volatile 

 carrying liquid and subsequently applying a vulcanizable com- 

 pound. (The Canadian Consolidated Rubber Co., Limited, 

 Montreal, Quebec, Canada, assignee of Erwin E. A. G. Meyer, 

 Detroit, Michigan. Canadian patent No. 186,407.) 



THE UNITED KINGDOM. 



Substitutes for 1nt)1.\ Rubber.— Substitutes for india rubber 

 are made by mixing together a fatty oil, sulphur or compound of 

 sulphur, and stearine or other hard fat, with or without other in- 

 gredients, and then heating them. The following; is one example 

 of ingredients and proporiions: linseed oil. 1 part; sulphur, 1 

 part ; stearine, 1 part ; oxide of iron, J4 part. A small proportion 

 of tar, or resin or other pitch-like substances may be added. Also, 

 lime may be added. The material may be strengthened by add- 

 ing sawdust, cellulose in the form of cotton, jute, and paper. The 

 material forms a varnish with most of the well-known rubber 

 solvents. (F. J. Bennett, Gordon Cross House, Dronfield, Derby- 

 shire, and F. W. Mellowes, Corporation Works, Corporation 

 street, Sheffield, England. British patent No. 119,878.) 



Leather Substitute.— Relates to rubber substitutes of the kind 

 containing scrap and new rubber, scrap leather, and cotton or 

 other vegetable fiber. It may include a coloring agent and slate 

 or cement for increasing the weight. (J. L, Watkins, 1 Jeffrey's 

 load, Clapham road, London. British patent No. 119,902.) 



Colored Rubber.— A sheet of rubber or fabric is provided 

 with pigment, as aluminum pow^der, in its outer layer only, the 

 pigment being embedded by vulcanization so as to produce a 

 smooth glossy surface. (W. T. Mellersh-Jackson, 28 South- 

 ampton Buildings, London, England. [India Rubber Co., 1790 

 Broadway, New York.] British patent No. 120,824.) 



Halogenating Rubber.— Alkyl, alkylene, alkenyl, and aryl 

 halides, such as trichlorethylene and tetrachlorethane, are used 

 as solvents in the making of halogenated india rubber, gutta 

 percha or balata. (S. J. Peachey, 5 Yew Tree Road, Davenport, 

 Stockport, England. British patent No. 121,091.) 



AUSTRALIA. 



Tire Sealing Composition.— This is identical with U. S. pat- 

 ent No. 1,271,015 (The India Rubber World September 1. 1918, 

 page 723.) (Puncture Cure. Limited, assignee of Ernest Camp- 

 bell and T. F. Cushman, Calgary, Alberta, Canada. Australian 

 patent No. 5,872.) 



Box-toe Stiffener.— A self-hardening compound consisting 

 of asphaltum, paraffine wax, carnauba wax and gutta percha for 

 use in molding under heat and pressure to form desired. (J. 

 H. Ordway, Massachusetts, U. S. A. Australian patent No. 

 5,933.) 



THE FRENCH REPUBLIC. 



Colored Rubber.— Process of making colored rubber and 

 products obtained by the aid of rubber. Same as British patent 

 No. 102,824. (India Rubber Co., 1790 Broadway, New York 

 City, U. S. A. French patent No. 488,372.) 



ESTIMATION OF UNSAPONIFIABLE RESINS IN RUBBER. 



The following abstract from the "Journal of the Society of 

 Chemical Industry," volume 37, 341A, outlines the method of P. 

 Dekker on the estimation of the content of unsaponifiable resins 

 in various kinds of rubber mixings : 



When the mineral oil in a rubber mixing is estimated by the 

 measurement of the unsaponifiable portion of the acetone extract 

 which is soluble in petroleum ether, the accuracy of the result is 

 affected by the fact that a part of the rubber resins resists saponi- 

 fication and is included with the mineral oil. The oxidation pro- 

 ducts of rubber are completely saponifiable, and the ordinary 

 method of analysis includes them with the saponifiable resins. 



LABORATORY APPARATUS. 



LABORATORY GRINDING AND KNEADING MACHINES. 



' I ' HERE is daily occasion in the rubber laboratory, as in 

 many others, for grinding and mixing machines in the 

 preparation of samples where 

 the ordinary roller mixer is 

 not suitable. This requirement 

 is met most effectively by the 

 new scries of grinding and 

 kneading or mixing machines 

 here illustrated. They are built 

 in three laboratory sizes. Bolli 

 grinder and mixer are elec- 

 trically driven. The former 

 has a very unique feature in 

 its interchangeable grinding 

 units. These units can be fur- 

 nished for either wet or dry 

 grinding and are easily joined 

 with or separated from the pow 



Laboratory Mixer. 



bcr of these interchangeable grinding 



This permits 

 s to be kept on hand. 



Laboratory Grinder. 



each unit being used for a separate purpose. (Werner & 

 Pfleiderer Co., Inc., Saginaw, Michigan.) 



ABBE REFRACTOMETER. 



The Abbe refractometer is shown in the illustration as manu- 

 factured by Adam Hilger, Limited. 75a Camden Road, London, 

 N. W. In addition to its well-known general use as a labor- 

 atory instrument for the identilication of oils, resins, etc., the 

 .\bbe refractometer here referred 

 to is coming into use for the 

 control of solutions of rubber and 

 the solvents used in their manu- 

 facture. These instruments are 

 standardized and the parts are in- 

 terchangeable, a matter of great 

 convenience in repair replace- 

 ment. It is suggested that this 

 refractometer might form a valu- 

 able aid in dealing with such 

 problems as the following: 



Ascertaining degree of vulcani- 

 zation of lightly cured goods. 



The determining of resin in 

 rubber. 



The establishing of some re- 

 lation between the quality of different rubbers, and such an 

 easily measured physical property as the refractive index. _ 

 {Eimer & Amend, 211 Third avenue, New York City.) 



Refractometer. 



