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WHITER, LIGHTER FOAM. A molded airfôam furniture cushion, m a d e from Goodyear's new Pliolite 5352, is stripped from a curing mold. T h e company plans to use the synthetic rubber latex to make all of its airfoam cushioning materials
DENVER THICKENERS
N e w Latex Bids for Foam Markets Goodyear's highly touted synthetic rubber latex will ease natural latex price squeeze, says company A .
• for a l l w a t e r a n d waste t r e a t m e n t , w a s h i n g , thickening a n d clarification o p e r a t i o n s . •
N e w simplicity, new efficiency, long, trouble-free service. Simple, rugged, fully-enclosed gear mechanism. Gear sizes through 7 2 " d i a . Spiral rakes or rakes to suit operation in tanks up to 150' d i a . W r i t e f o r Bulletin N o . T5-B6. Phone CHerry 4-4466
DENVER Adjustable Stroke DIAPHRAGM PUMPS
...for handling and metering thickened solids. Stroke can be adjusted while pump is oper ating. Capacity to 1000 g.p.m. Write for Bulletin P8-B12. See our catalog, pages 997-1004 in CEC.
DENVER EQUIPMENT CO. BOX 5268,; DENVER 1 7 , COLORADO 58
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N O V . 9. 1 9 5 9
IN'EW SYNTHETIC rubber latex—Plio-
lite 5352—has joined Goodyear Tire and Rubber's commercial chemicals line. Billed by Goodyear a s a "100r/c replacement for natural latex in foam rubber," the new synthetic also boasts: • Low price—32 to 35 cents a pound, or some 2 0 to 307c under current quotations for natural latex. • Processing and handling ease—Pliolite 5352, a t 70 r /c total solids, flows freely while natural latex at this concentration is practically a gel. Pliolite 5352 is a large particle size (3000 A . a v e r a g e ) , butadiene-styrene ( 7 0 / 3 0 ) latex. I t s diy rubber content runs 9 6 to 977c—just a s h a d e below that of natural latex (97 to 9 8 % ) . This is better than currently available
high solids synthetics, which run from 95.5 down to 91.5 r /i, Goodyear spokesmen say. This combination—high rubber hydrocarbon content a n d t h e consequently lower percentage of n o n r u b ber materials—makes for better foam rubber processing, t h e company points out. Over a 4 0 ° to 80° F. range, Pliolite 5352 shows excellent viscosity-temperature properties, Goodyear claims. This improved fluidity means that t h e new latex can b e concentrated to a higher total solids content a n d thus give technologists greater freedom in using pigment extenders to make foam rubber. And it means less foam shrinkage during processing, t h e c o m p a n y adds. T h e new latex h a s a minimum solids content of 887c .
N e w uses are still being found for
GROCO RED OILS & WHITE OLEINS WHITE OLEINES ..SPECIFICATION'
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ΜΜΙΜΗΗ Fo?" mo?^ information on A. Gross fatty acids, send for neiv edition of "Fatty Acids in Modern Industry."
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The new p r o d u c t also shows good resistance t o heat and light discoloration, a n d t o fungi and bacteria. Another useful property of Pliolite 5352, says Goodyear, is its low surface tension—30 dynes per centimeter a t 4 0 % total solids. As a result, Pliolite 5352 and natural latex can be b l e n d e d without using a stabilizing soap. And less soap is required for foam r u b b e r processing, Goodyear claims. • Price Stabilization. Freedom from fluctuating natural latex prices with a stable domestic r a w material source—that's the prime a d v a n t a g e to switching to all synthetic latex in foam rubber, says R. E. Pauley, general manager of Goodyear foam products. Latest estimated market p r i c e of natural latex is slightly over 4 2 cents per pound—the result of a steady 2 5 % climb over the past two years, h e points out. At t h e same lime, other low-cost foam materials (for example, urethanes and vinyls) have sliced into foam rubber markets. Result: Goodyear has had to lower the price of i t s airfoam by more than 2 5 % within less than two years. C a u g h t in this vise, Goodyear sank some $ 1 million a n d 18 months into the development of Pliolite 5 3 5 2 , he explains. But consumers can look for n o cut in foam r u b b e r prices at this t i m e , Mr. Pauley warns. " T h e savings h a v e already been passed along to the consumer over the past year. This anticipatory action on our part a year ago i s now m a d e practical by volume p r o d u c tion of our n e w synthetic/' h e points out. • Market. Present Goodyear estimates peg the latex foam rubber market at some 74,000 long tons a year and predict a sharp increase for t h e future. More than 80r/c of this is n a tural rubber latex. Up t o now, Goodyear points out, synthetics, w i t h their high nonrubber content, small particle size, and other undesirables, w e r e used mostly as extenders for natural latex in foam rubber. Goodyear's conversion t o Pliolite 5352 in airfoam manufacture is already about 70 f/c complete. T h e entire changeover is expected t o be completed by early 1960. T o m e e t expected increases, t h e company has just completed an expansion of its latex p r o duction facilities in Akron. Goodyear's n e w total capacity for all latexes—about 27,800 long tons per year. C1
S I L I C O N E N E W S from D o w Corning
For A Sales Glow: Silicones IK HT m LESS
Quick, Deep, Lasting Gloss Keeps Your Polishes Popular It takes more than a single ingredient to make a successful polish. I t takes a lot of formulating skill and sound marketing decisions, too. among all the variables, this factor remains constant: including Doiv Corning Silicones in your product pays off. literally. This is true whether your polish is for glass, autos, furniture, appliances . . . silicone fluids improve the formulation — help increase sales. Dow Corning silicone fluids make polishes easier to spread . . . quicker to shine-up . . . richer and deeper in gloss . . . longer lasting. Silicones repel water in a really superlative manner . . . resist spotting . . . withstand weathering and oxidation, too. Taken together, these qualities mean less efiort, less time and better results for the consumer. That in turn means a better product image for you . . . more of those all-important repeat sales. To get the maximum in consumer desire-to-buy, give Dow Corning Silicones a prominent place in your polish . . . and on your labels, too. Consumers are aware of the protection silicones provide . . . are sold on products that contain them! Dow Corning development chemists have compiled extensive information on silicone fluids in polishes — are continually working to develop new products for new applications. For the latest and most complete information on Dow Corning Silicones for different types of polishes, contact our nearest branch office or write Dept. 2823.
DowCorningCORPORATION
Your nearest Dew Corning office is the number one source for information and technical service on silicones.
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CHEM
Briefs · · . r rîew reagent- for fluoride analysis h a s b e e n a d d e d to its line b y F i s h e r Scientific, P i t t s b u r g h , Pa. Thorium c h l o r a n i l a t e d e t e r m i n e s fluoride colorim e t r i c a l l y in a m o u n t s as l o w a s 0 . 1 p.p.m.. the c o m p a n y says. Fluoride i o n r e a c t s w i t h the r e a g e n t in a solut i o n b u f f e r e d a t p H 4 . 5 ; a b s o r p t i o n is m e a s u r e d a t 5 4 0 m μ. o r a t 3 3 0 m μ. D e t e r m i n a t i o n s take a b o u t o n e h o u r to run. C 2 • Reagent grade 4 8 % hydrobromic a c i d is n o w a v a i l a b l e f r o m F o o d M a c h i n e r y & C h e m i c a l , N e w York C i t y . Useful as a r e a c t i o n i n t e r m e d i a t e , t h e a c i d meets A C S specifications, includ i n g l o w c h l o r i d e , s u l f a t e , a n d sulfite c o n t e n t , F M C says. C 3 • High t e m p e r a t u r e p r e s s u r e s e n s i t i v e t a p e i s r e s i s t a n t t o m a n y fuels a n d c h e m i c a l s , s a y s its d e v e l o p e r , C o n necticut Hard Rubber, N e w H a v e n , Conn. It c o n s i s t s of a 3 m i l T e f l o n b a c k i n g a n d a 3 mil h i g h t e m p e r a t u r e fluoropolymer adhesive. The tape w i t h s t a n d s t e m p e r a t u r e s f r o m —50° t o over 4 0 0 ° F., c a n b e u s e d as protec t i v e i n s u l a t i o n , C H R says. C 4
• F u n g i c i d e , b y Eli Lilly & C o . , In d i a n a p o l i s , h i d . , c o n t r o l s gladiolus c o r m diseases a n d increases flower s p i k e pro d u c t i o n a n d q u a l i t y , a c c o r d i n g t o the c o m p a n y . T r a d e n a m e d E l c i d e 7 3 , the a g e n t is a m e m b e r of a class of c o m pounds called thimerosal (sodium e t h y l m e r c u r i t h i o s a l i c y l a t e ) . K e y t o ac tivity: lower phytotoxicity than other f u n g i c i d e s , t h e c o m p a n y says. I t is a v a i l a b l e in 1-, 5 - , a n d 5 5 - g a l . u n i t s . Co • H e r b i c i d e to c o n t r o l d e e p r o o t e d w e e d s a n d hard-to-kill w e e d t r e e s is m a d e by Allied C h e m i c a l , N e w York C i t y . C a l l e d U r a b , t h e a g e n t is effec tive a g a i n s t s c r u b oak, wild hickory, sassafras, poison s u m a c , a n d o t h e r w e e d t r e e s . T h e toxic i n g r e d i e n t in U r a b
ICALS
( 3 - p h e n y l - l , 1 - d i e t h y l u r e a trichloroacetate ) is s o l u b l e in w a t e r , thus i s carried d o w n i n t o t h e d e e p r o o t zone by rain w a t e r , Allied s a y s . C7 • R e f i n e d silicon m o n o c r y s t a l s , s e m i c o n d u c t o r g r a d e a n d d o p e d to c u s t o m e r n e e d s , a r e a v a i l a b l e f r o m Grace E l e c tronic Chemicals, Baltimore, M d . Und o p e d m o n o c r y s t a l s h a v e resistances of 8 0 0 o h m - c m . or h i g h e r , lifetimes i n ex cess of 2 0 0 m i c r o s e c o n d s , the c o m p a n y says. C8
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Use this h a n d y self mailer t o obtain further information or literature. Simply mark, clip coupon, fold, and mail Every week C&EN's editors survey a large volume of valuable scien tific, technical, and business information issued in the form of product announcements, booklets, catalogs, data sheets, etc. This material is digested and presented in several departments. For your conven ience this coupon is provided to facilitate requests for further informa tion on these items as well as on products and services mentioned in advertisements. Name
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( Yarn With α Twist P h o t o m i c r o g r a p h of D u F o n t ' s n e w O r ion 21 a c r y l i c fiber s h o w s h o w " c o r k screw" c r i m p gives yarn a b u l k y a p pearance without increase i n weight. T h e permanent c r i m p , w h i c h may dis appear i n t h e h o t - w e t state, returns t o normal u p o n d r y i n g , D u P o n t says. M a d e a t the c o m p a n y ' s C a m d e n , S. C , p l a n t , t h e fiber will sell at $ 1 . 5 3 p e r pound. C 5
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