THE CHEMICAL WORLD THIS WEEK mersion media and the shear strength of the bonds lead to t h e conclusion that the primary bond is ionic in nature. N o work of this kind has heen done previously. In the case of carbon tetrachloride a n d acetone1 as immersion media, there is apparently a reaction taking place between them and the bonding agent, since after reconditioning t h e r e is noted an increase in wet strength. T h e oil color committee of the AO(!S discussed a t its meeting t h e failure of the new photometric method for oil color determination t o produce results corresponding with t h e Lovibond method wlien applied t o certain Texas oils, but no recommendation w a s made to alter the method. Additional work on m e t h o d s of standardization of instruments is contemplated and the desirability of establishing a secondary- color standard (perhaps cobalt chloride solution) in the red region will be studied. Award of t h e AOCS cup for highest proficiency in determining oil a n d nitro-
gen went this year to P. D . Cretien, Texas Testing Laboratory, with a 99.991 f/c proficiency. Second place w i n n e r was R. C. Pope, Pope Testing Laboratories, with 99.982 r ^ . First place winners in the oilseed series were G. R. Thompson, Southern Cotton Oil Co., cottonseed, 99.2S-rethrins. In all formulations tested, moreover, good results have been obtained by the substitution of allethrin for pyrethrins o n a weight-for-weight basis. It h a s become apparent, however. that synergists effective w i t h pyrethrins do not all work well w i t h aflethrin. W h e n pyrethrins a r e replaced b y allethrin, said Dr. Fales, it is necessary to add a syner gist for the allethrin component. Solid nonionic detergents "which can be formulated in any proportion with other solids t o give free flowing products h a v e yielded promising results in studies of fundamental detergency properties, said FL h. Suter of t h e W y a n d o t t e Chemical Corp. Carbon soil removal a n d whiteness retention tests h a v e indicated the suit ability, particularly for h a r d water deter gency, of t h e ternary system: solid nonionic d e t e r g e n t - a n ionic detergent—sodium carbovymeihyl cellulose. Fundamental detergency data, said Dr. Suter, have pro vided a foundation for t h e selection of an organic detergent base for use either in combination with builders o r for further formulation into a completely built deter gent. Such a base, studied in conjunction with s o d i u m tripolypbosphate and soda ash, h a s led to t h e formulation of a com pletely built detergent containing a solid nonionic. This composition compared favorably, according to Dr. Suter, with materials of proved effectiveness for cot ton detergency in soft or h a r d waterSpecific application of nonionics in the d r y cleaning industry 7 has progressed to a great extent during t h e last decade, George E. Barker of t h e Atlas Powder Co. reported. Nonionics have aided consid erably in decreasing t h e n u m b e r of operaAND
ENGINEERING
NEWS
N a u g a t u c k Marvinol lifts the lid on your plastic future T h e r e is a g o o d deal more than ice cubes in this unusual bucket made or Marvinol virivl rc-sin. It you look into it. chances are you'll find a whole "bucketful" of promising ideas for your product future. Look what Marvinol did tor this product! In the new celltriar form, this "n'Icer"* Bucket is "finger-lift" light s o fltxihL iz can squeeze apart clustered ice cubes . . . so insulating that the ice cubes are 90,'ύ themselves after tour hours! It won't tarnish — is unbreakable, is lovely to look at and can be made in all colors — a perfect compli
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ment t o any table. It i??iparts no odor or taste. As you read about Marvinol-made ice buckets, per haps you can visualize what Marvinol may do to improve your products. Marvinol can create hundreds of t h i n g s film, sheeting, sponging, or rigid—better and more economically. And in Naugatuck Chemical, you have a reliable, basic source of raw materials that's in business to stay. Write us on your company letterhead today. *MuJt by T/JL Sponi^t Runbtr
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