• Comparative Results. T o com pare t h e A-1 resin with a sulfonic cat ion resin ( t h e most widely used ion exchange resin), Dow ran a series of tests on a 3*>< sodium chloride solu tion containing 250 p.p.m. of cupric ion. When the A-1 resin was used, cupric ion did not appear in the efflu ent until about 70 bed volumes of efflu ent had been collected. With the sulfonic cation resin, cupric ion began appearing in the effluent almost im mediately. In fact, the concentration of cupric ion began rising very rapidly after the collection of only about eight bed volumes of effluent. Dow expects its A-1 resin to find one of its main uses in removing heavy metals from process streams. it can also b e used to recover metals from waste streams, anil to purify analytical grade reagents. Now available in de velopment quantities, it can readily be made in much larger amounts should demand warrant. CΪ
CHEMICALS
• Three new modified g u m rosin sizes
Chelating Resin Separates Ions D o w Chemical's n e w ion e x c h a n g e resin has chelat ing g r o u p s with high affinity f o r h e o v y metals U o w C H E M I C A L is now offering w h a t
it describes as the first commercially' available ion exchange resin with che lating properties. Its new Dowex Chelating Resin A-1 not only can r e move metal cations completely from solution, which is a property common to ion exchange resins, but also has a high selectivity for metal ions, typical of liquid chelating agents. The A-1 resin can b e used to r e move traces of copper, iron, nickel, zinc, and other metals from solutions containing as much as 10 to 2 0 % of a salt such as sodium chloride. Salt solutions that concentrated usually in terfere with the performance of or dinal*} ion exchange resins. T h e A-1 resin maintains its selectivity for heavymetals even in solutions containing rel atively high concentrations of sodium, calcium, magnesium, ammonium, o r similar ions. The new resin can also be used t o separate heavy metals from one a n other. It will retain nickel from solu
tions containing nickel and cobalt and will hold back copper from solutions of copper and nickel. Although this can be done with existing ion exchange resins, the r e q u i r e d flow rates are some times prohibitively low. The metals picked u p by the resin can b e recovered by treatment with a mineral acid of at: least 1 Ν concentra tion, However, since the resin is re generated by a c i d , it is not very effi cient in separating ions at low p H , particularly b e l o w pll 2. Chemically, tlie A - 1 resin is a styrene-divinylbenzene copolymer to which iminodiaceMate chelating groups have been a d d e d . Similar in action to the Yersene clielating agents, these groups strongly attract metal cations. A major job iri developing the new resin was to find an effective way to attach a high percentage of chelating groups to the insoluble copolymer. Another p r o b l e i n was to prepare the resin in a form that is stable 'both chemically and physically.
are now available from American Cyanamid, N e w York. Accobrite 4028, an unfortified size, is claimed to be ideal for use iu paperboard production Cyfor 4016A and Cyfor 4029, both fortified sizes, are for sizing all grades of paper and paperboard. C2 • Fungicidal a n d fungistatic a d d i t i v e
for polyvinyl chloride compounds is now marketed by Ottawa Chemical, Toledo, Ohio. Called Ottacide P, the product is said to inhibit fungus growth in both semirigid and flexible polyvinyl chloride compounds, as well as in their copolymers. C3 • Cyprex fungicide, by American Cyanamid, N e w York, protects apples and apple trees against apple scab. When applied after an infection period, it eradicates any scab that may become established on n e w or unprotected surfaces, the company points out. T h e product is dodecylguanidine acetate, and is reported to have a unique ability to penetrate apple leaves. C4 • Isobond 3 3 1 , from Isochem Resins, Providence, R. I., is a one-part 10(Kr epoxy adhesive for high-speed produc tion use. T h e material is said to have great adhesion to metals, glass, ce ramics, and most plastics. It can be fully cured in 2.5 hr. at 250° F., or in 15 m in. at 330° F., the company claims. C5 JAN.
2ό,
i 959
C&EN
49
CHEMICALS
• Polyvinylpyrroiîdone w i t i i an average molecular weight of 10,000 ia» now available from Antara Client icals. New York. Called PVP K-15, t h e product is recommended as a dispersant iiii detergent systems, pigment fosrmukations, and cosmetics. It also has good protective colloid action in suspension polymerizations of polyviin 1 chloride, sa> s the company. Cό • Perchloroethylene is now Ibein^ mar keted by Vulcan Materials, Wichita, Kan., on a national basis. I t cornes in dry cleaning and industrial gradues. C7
• New chemicals from Cyclo* Chemical, Los Angeles, Calif., are 2,4-sdinitrobenzenesulfenyl chloride ( Khîarascïi reagent) for characterization of olefins, acetylenes, alcohols, and otlher cliemicais; 2,4-dinitrothiophenoI (Bost reagent) for characterization of alkyl halides; p-chlorobenzenesulf enyl chlo-
C & E N
ride for organic synthesis; and benzenesulfenyl chloride for determining olefins in gasoline. C8
tory grades for uses requiring minimum shrinkage effects and low impurity levels. C 11
• 1,4-Butanedio!,
• M i l d e w c i d e fungicide for use in paints is now marketed by Galiowhur Chemical, Ossining, Ν. Υ. Called Puratol-30. the phenyl mercuric com pound is stable and compatible with a broad range of oil, alkyd, and latex paints, according to the company. C 12
anhydrous,
now
m a d e by Antara Chemicals, N e w York, can he used as a cross-linking agent for making cast m e t h a n e elastomers and surface coatings. C 9 • R a d i o c h e m i c a l s now made by N e w England Nuclear, Boston, Mass., in commercial quantities are cortisone-4C 1 4 and thymidine-2-C 1 4 . CIO • Eiectricaliy fused m a g n e s i u m o x i d e g r a i n has been developed by General Electric, Pittsfield, Mass., for ceramic and electronic uses. Fine granulation periclase comes in crystalline form for use in extrusion, as a filler, in molding and pressing of shapes, and for separating steel plates during annealing. Periclase grain containing 96 to 9 9 ' r magnesium oxide is available in refrac-
P R O G R E S S»
• CI é v i t e 3 0 0 is an iron-base metallic compound developed by Clevite Corp., Cleveland, Ohio, as a high-temperature material for test and evaluation programs in sleeve bearing and seal a p plications. C 13
j j
Further useful information on keyed C h e m i c a l items men-
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ι
h o n e d IS r e à a i i y a v a i i â o i ê . . .
!
I
L'se handy coupon on page 56 ^
I
R Ε Ρ Ο R Τ
Industrial Chemical Specialties Companies a d d e d these products to their lines during the past five weeks Material Aluminum paint additive (Alcoa Sta bilizer N u m b e r 5)
Company Aluminum C o . of America Pittsburgh, Pa.
Autolyzed brewers yeast fraction (300 Series Amber B ^ T ) Polyester resin (Laminae 4104)
Amber Laboratories M lwaukee, Wis. American Cy r anamid N e w York, Ν. Υ. Armour and Co. Chicago, 111. Armstrong Cork Lancaster, Pa. Baltimore Paint and Chemical Baltimore, Md. Becco Chemical Buffalo, Ν . Υ. Betz Laboratories Philadelphia, Pa. Borden Chemical New York. Ν. Υ. Climax Molybdenum New York, Ν. Υ. Columbia Technical Woodside, Ν. Υ.
Cationic surfactant ( RD-2873-P) Sealing compound (Armstrong P-606 Seller) Fire-retardant paint (SAÎFTy-pe 3 0 3 ) Series of alkyl epoxyhexahyelrophthalates Solvent (Betz Boil-Out ZVlixture) Cold water-soluble caseins (Protovac PV-424, 428, 430, and 800) Molysulfide chassis gréasses Humidity-proofing coatirkg (HumiSeal Type I F L > ) v-el. Geigy Chemical Yonkers, Ν. Υ.
Use on chemical tank exteriors and other vessels; maintenance coating Nonselective or industrial weed control on noncropped land Correcting iron deficiency in plants
r«:
r>u„
v*cigy
V_>IICIIIJ.*-«.H
for
Silicone-modified encapsulating resin (Fosterite SFR BT-3199)
Yonkers, Ν. Υ. Hooker Chemical Niagara Falls, Ν. Υ . Jios.ï'dîtoïi Labor's ior~£es Olean, Ν. Y J. M. Huber Corp. New York, Ν. Υ. J. M. Huber Corp. New York, Ν. Υ. Jones-Dabney C o . Louis\-ille, Ky. Lehigh Chemical Chestertown, Md. National Aluminiate Chicago, 111
National Starch Products New York, Ν. Υ. Nuclear-Chicago Chicago, 111. Resinformulators*, Inc. Los Angeles, Calif. Schenectady Varnish Schenectady, Γ\τ. Υ. Sherwin-Williams Chicago, 111. Taylor Fibre Norristown, P a . Ihiokol Chemical Trenton, N . J. Tidewater Oil New York, Ν . Υ. Union Carbide New York, Ν . Υ. Vitro Corp. of America New York, Ν . Υ. Westinghouse Electric Pittsburgh, P a .
Available in commercial quantities unless otherwise noted.
52
C & EN
JAN.
2 6,
1959
;«„i
National Research C o r p . Cambridge, Mass. National Research Corp. Cambridge, XIass.
Iron-aluminum-manganese alloys
Carrier starch
D o w Chemical Midland, M i c h . Drilube Co. Glendale, Calif. Du Pont Wilmington, E>el. Du Pont Wilmington, E>el. Emery Industries Cincinnati, Ohio Fisher Scientific Pittsburgh, Pa»
Use on bare or burned off wood Making void-free moldings and very thin electrical tape Stabilizers in vinyl formulations High-purity solvents for standardizing chromatographic equipment
Flushing rocket and missile parts; vapor degreasing Rebuilding areas worn awav bv sliding contacts Promoting ease of flow, film durability, and uniform flatting in paints Reinforcing polymers where light, bright colors are required Protective coatings and plastics Use with liquid oxygen Additives or surface coatings to impart nonskid properties to paper, plastics, and waxes High temperature applications in air craft, missiles, and automobiles Catalytic chemical processes, powder metallurgy, and solid rocket propellants Use in the corrugating industry Making absolute calibrations of count ing systems; teaching aids Patching compound for concrete Protecting electrical and electronic equipment from fungus attack Use in printing inks, paints, plastics, and rubber Self-extinguishing fabricating material Compounding elastomeric, semirigid, and rigid plastics Use in marine turbines and other en gines where reduction gears are em ployed Use in the ceramic industry Treating electronic components that re quire high moisture resistance and flame retardai!ce
