Document OzwRMDXBeO0npemagXbVRe01K

FILE NAME: Chemical Abstracts (CHAB) DATE: 1937 DOC#: CHAB011 DOCUMENT DESCRIPTION: Abstract Originally Published in 1937 by Page I 3 3 ' Ico'3 1938 1009 13--Miscellaneous Industrial Products 1010 det. quartz. After the minerals and other constituents of 1 Insulation power factor. H. W. Bousman. Gen. a dust samp) have been identified, it is usually possible Elec. Rev. 40, 522-5(1037).--A review. C. G. F. to choose suitable procedure. Sixteen references. The testing and properties of heat-insulating materials J. A. Kennedy A. H. Jay and L. Lee. Brit. Ciayworker 46, 318-23 Study of dust-control methods in an asbestos-fabricating (1937).--The max. safe temp, is defined as the highest plant. Richard T. Page and J. J. Bloomfield. U. S. temp, a brick can withstand for a prolonged period with Pub. Health Repts. 52, 1713-27(1937).--The study is out changing more than 1% linearly. The more im presented as an example of engineering control of an in portant tests are: crushing, porosity, permeability, spall dustrial hazard. Adequate data have not yet been pub ing resistance, max. safe temp, and thermal cond. lished to justify the detn. of threshold limits of dustiness , E. C. Petrie which will produce asbestosis in any definite period of time. Electrical impregnation processes. E. E. Hall. Icc In their absence, it is not possible to det. permissible and Cold Storage 40, 163--1(1937).--The impregnation of limits of dustiness on a medical basis. Any appreciable elec, equipment such as condensers with wax or other decrease in the amt. of asbestos dust will cause a decrease nonconducting substances is discussed. Paper condensers in the incidence and severity of the resulting asbestosis. consisting of 2 or more electrodes sepd. by paper insulation Elimination of all dust in an industrial workroom is rarely are first heated to remove moisture. Preliminary dry-ing necessary from a physiol, standpoint and is usually eco is effected by passing a current of hot air through the nomically impracticable. Consequently, actual atm. 3 system. A vacuum is applied to complete the drying at conditions in an industry resulting from the application of the end of which treatment the imprgnant (usually hot practical methods of dust control can be used as temporary wax) is introduced without breaking the vacuum' At standards by that industry. Seven references. the end of the impregnation period, excess wax is with J. A. Kennedy- drawn and the charge being processed is cooled. In order New domestic and foreign patents in the field of the to accelerate cooling, temp, as low as --8 to --12 is production and application of synthetic (plastic) ma used. _ A. H. Johnson terials. Oskar Kausch. Kunststoffe 27, 149-51, 273 0 Adhesives and other products (used when laying) lino (1937).--Over 100 patents issued during the latter part of , leum. F. Ohl. Kunstdnger u. Leim 34, 257-63(1937). 1936 are reviewed. J. W. Perry 4 --Various compns. and their advantages and disadvan Phenol and cresol resins, l-'ritz Seebach. K u n s t tages are reviewed. J. W. Perry stoffe 27, 287-90(1937); cf. C. A. 31, 6370'.--The type Which synthetic plastics are used as adhesives, cements, of intermediate cryst. product obtained on reaction of putty and (paint) vehicles? F. Ohl. Kunstdnger n. PhOH with CHjO is detd. to a large degree by the type of Leim 34, 283-90(1937).--A review of recently developed condensation catalyst. Thus with acid catalyst, 4,4- German products. J. W. Perry- dihydroxydiphenylmetkane (I) predominates, while basic Recent developments in the field of glue for wood and catalysts, e. g., MgO or NHJ( favor formation of 2,4- strength tests. Edgar Mralh. Kunstdnger u, Leim dihydroxydiphenylmethane. Other catalysts, e. g., A1CI,, 5 34, 224-7(1937).--Adhesives made from artificial resins produce large amts, of both isomers. Similar results (PhOH-CH-O, urea and thiourea condensation produits were obtained with cresols, the following products being and polyvinyl and polyacrylic derivs.) are emphasized. isolated and their cryst. structure characterized with , _ J- W. Perry photomicrographs: 4,4'-dihydroxy-3,3' -dimelltyldiphenyl- Replacing rubber for certain uses with glycerol-glue methane, m. 125, and 4,2'-dihydroxy-3,3'-dimethyl- (compositions). Walter Obst. Kunstdnger u. Leim diphenylmelhane, in. 121, from o-cresol; H,c>'-dihydroxy- 34, 96-8(1937).--Possibilities and limitations arc dis 3,3'-dimcthyldiphcnylmethane (II), m. 126, and small cussed. J. W. Perry amts, of 2,6-di-(3-methyl-6-hydroxybenzyl)-4-methylphenol, 6 The drop diameter. (A method for) determining the in. 215, from -cresol; 4,4'-dihydroxy-2,2 '-dimelhyl- utility of foaming, wetting, washing, cleaning and similar diphenylmelhane, m. 102, and 4,2'-dihydroxy-4'-2- agents. J. Hetzer. Fette u. Seifen 44, 425-6(1937); dimethyldiphenylmelhane, m. 147, front /-cresol. 'These ef. C. A. 31, 5059s.--A method is described lor using a cryst. reaction products, which probably exist in phenolic glass cell with a tight-fitting cover to det. the max. diain. resins in solid soln., were isolated by distil, or by pplu. of a liquid drop which will adhere to the underside of a from an alk. soln. with dil. acid. The above-mentioned horizontal glass surface. Expts. with aq. soins, eonlg. diphenylmethane derivs. were converted into readilv sol. varying concns. of "Nekal A trocken" show that the max. Na phenolates with the exception of II, while with I un drop diam. becomes smaller as the drop no. (detd. in a explained phenomena were observed, which are being 7 slalagmometer) increases. The. drop diam. method is the investigated further. J. W. Perry- quicker and easier to carry out. J. W. Perry- Patentability and artificial resin emulsions. Johannes meAticddIenndd.a4o1n, 7e7m4u-5ls,i7fi7e9rs(.193F7r)a.--nciEsmCuhlislisfoynin. g eDqruuigpmCeonst Gomory. Farben-Chem. 8, 310, 317(1937).--Safeguard ing the welfare of the nation when passing on questions is discussed. H. M. Burlage of patentability, e. g., of alkyd resin emulsions, is empha The newer detergents. Charles E. Mullin. Soup 13. sized. J. W. Perry- No. 12, 27-30, 73-4(1937); cl. C. A. 32, 265L- The Rayon, artificial resins and artificial substances. F. properties, advantages and inanuf. of compds. of the higher ales, are discussed. ' E. Scherubel Ohl. Monatsh. Seide Kunstseide 42, 427-31(1937). 8 The structure and electrical properties of protective The treatment of rayons with phenol-formaldehyde or films. L. Hartshorn, N. J. L. Megson and E. Rushton. urea-formaldehyde resins (e. g., Kaurit KF) renders J. Svc. Chem. Ind. 56, 26&-70T( 1937).--Films of PliOH- them resistant to creasing and water and increases their CHaO resin, prepd. by dipping copper foil into ale. solus, of strength. The resistance to creasing can also be height resin, were placed between Hg electrodes and the dielee. ened by means of polymers of unsaid, aliphatic acids. const, and cond. was measured with a Schering bridge Commercial waterproofing agents are listed. Syuthofil, a (C. A . 27, 2099). Within the limits of exptl. error, the polyvinyl ale. deriv., is used in place of catgut. As dielec, const, and power factor of films of the same resin textile sizes are used polymerized vinyl derivs. aud cellulose do not vary appreciably with thickness. The material may ethers. Rubber substitutes, synthetic materials suitable 9 be regarded as homogeneous and films of varying thickness for elec. insulation aud numerous synthetic usius, with can be said to have a similar phys. structure. The dielee. their uses, are mentioned. Leopold .scheflan const, and power factor (cond.) of synthetic resin and Molds for phenol resinoids. T. E. Casey. J. Am. cellulose acetate films are reduced considerably by intensive Soc. Naval Engrs. 49, No. 3, 390-445( 1937).--A discussion drying at 100 at low pressure. From the decrease in of mold types, operation and problems in their use and dielee. const, on drying the water absorbed can be eslil. maintenance. W. H. Bruckner The water absorption of phenolic resin films was detd. Insulation material and applications. F. L. Doty. gravimetrically and found to be independent of the thick Elec. J. 34, 445-9( 1937) .---A review. C. G. F. ness tip to 0.0105 cm. The measured amis, correspond