Briefs ...
CHEMICALS
• Kawecki Chemical is now marketing a 2.75 to 3.25% boron-aluminum master alloy. Kawecki also has some other master alloys in limited quantities for research and development. These are: 5.0 t o 6.0% boron-aluminum, 5 and 10% tantalum-aluminum, a n d 5 a n d 10% niobium-aluminum. C2 • Cowles Chemical is now making diethyltoluamide. Developed by t h e Army and US DA, the chemical is used as an insect repellent for mosquitos, deer flies, ticks, chiggers, fleas, and t h e like. C 3 • Three n e w a d h e s i v e s to bond treated Teflon to itself or other materials have been developed by Raybestos-Manhattan. One adhesive is for maximum chemical resistance, one for dry use, and the other for heat resistance. All three adhesives are thermosetting. C 4 • Perimeter and c a v i t y wall Insulation
is now being made b y Dow Chemical. The insulation is a black smooth-surfaced board of expanded polystyrene. Each board is 1 in. thick, 2 ft. wide, and 8 ft. long. C 5 • Rohm & Hcas has a new acrylic emulsion that forms a film when it is dried at high temperature. The film is hard, tough, clear, and colorless, a n d stays that way on aging, the company claims. C 6
New polyethylene resin handles like a moderate to high melting point -wax, At 300° F. (8000 centipoises), the new "family addition" flows like a thick syrup
Polyethylene Family Grows N e w resin makes possible melt coatings, d i p coatings, castings, and slush moldings IHE
NEWEST OFFSPRING in t h e
poly-
ethylene family is Epolene C. The new resin, made by Eastman Chemical Products, has many of the properties of plastic-grade resins, yet can he handled much like a moderate to high melting point wax, the company says. Because of its wax-like properties the resin can b e used as a melt—with or without modification. At 300° F., the viscosity of the material is 8000 centipoises. W h e n 2 5 % paraffin is added, the viscosity drops to only 1300 52
C&EN
DEC.
2,
195 7
centipoises at 300° F., according to the company. Eastman is looking at several general areas that can use the resin, One of these is melt casting. The resin—with or without coloring agents-forms relatively hard, tough cast or slusTi-molded objects, Eastman claims. ^Protective coatings result when the in_aterial is used as a hot dip. And as a hoi melt, it can coat all types of paper, the company says. Conventional wax coating machines can be used, Eastman adds, -with only slight modifications. With a. hot melt, a more complete hond is formed between coating and paper than is possible with extrusion coating since the melt penetrates further into t h e paper, according to the company. C1
• Sfauffer Chemical is now making methanesulfonyl chloride in development quantities. Since it is highly reactive, the compound can b e used as an intermediate for pharmaceuticals, clyestuflFs, and other organic chemicals, according to Stauffer. C 7 • White mastic coating, n o w made b y Insul-Mastic, waterproofs, insulates, and beautifies concrete surfaces, tile roofs, and masonry buildings, the company says. The coating is a mixture of fibrous inorganic stabilizers, white mica, plasticizers, and pigments in a styrenebutadiene thermoplastic resin, according to t h e company. C 8 • Nuozene, a new paint additive now made by Proficient Paint, makes painted surfaces germ-proof, the company says. Repeated scrubbings do not hurt the germ-killing effect which lasts throughout the life of the paint film, according to Proficient. C 9 (Continued
on page
108)
DIRECTORY
CHEMICALS
SECTION
This section includes: CHEMICALS E X C H A N G E — Chem.: cals, Resins, Gums, Oils, Waxes, Pigments, etc.; EQUIPMENT MART—New Equipment, Instruments, and Facilities for Plant and Laboratory ; and TECHNICAL SERVICES—Consultants, Engineering. Testing and Professional Services.
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CHEMICALS E X C H A N G E 14
L I T H I U M URATE one o f the many special chemicals w e manufacture Write f o r c o m p l e t e listings
C I T Y C H E M I C A L CORP. 132 W . 22nd St.
New York 11, N . Y.
GO/VtFO^NJXS Send for compre-
list... R E S E A R C H ^H ^| ^^^ge^n^s^i v. e«CATALOG S P E C J A i T I I^S t O T ^ V 7 * ^ ^ ^ ^ t 054-E 2005 Hopkins St.
MUCIC A C I D for SALTS a n d ESTERS
—y
READING REAL a,Do-'ca,t&tie&', INC. Reading, Penna.
N,N-DIETHYL ETHYLE1STEDIAMIKTE I n t e r m e d i a t e for PRarmaceutical M a n u f a c t u r e For D a t a a n d Prices Write t o : THE AMES LABORATORIES, INC. 132 Water S-tx-eet
S. Norwalk, Con.n.
LITERATURE (Continued
from page 89)
alysis" prepared by the authors with cooperation of V . A. Stenger and G. Matstiyama. Catalysis in Practice. C. H. COLLIER, editor, iv -f- 153 pages. Reinhold Publishing Corp., 430 Park Ave., New York 22, N. Y. 1957. $3.95. Based on "Experience in Industry" Symposium jointly sponsored by the Philadelphia-Wilmington Section of AIChE and the University of Pennsylvania.
Berkeley 7, Calif.
Butadiene Sulfone Thiolacetic A c i d Oxalyl Chloride Allyl Mercaptan Isoprene Sulfone Trimethylene O x i d e
$40/kg. $40/kg. $70/kg. $ 6 0 / 5 0 0 gms. S 3 0 / 1 0 0 gms. $ 3 0 / 1 0 0 gms.
Kapfop Laboratories 6710 W . Jefferson
Detroit 17, Michigan
ISTEROIDS and other tagged compounds, OF H I G H RADIOPURITY
.«oc».ISOTOPES '
'
C
4
s T K N'vES INC.
p.O B o x 6 8 8 . B u r b a n k . Ca1 i f o r n i a
YOUR ANNOUNCEMENT in Chemicals Exchange can carry YOUR MESSAGE to the readers of the leading publication in the chemical process industries. CHEMICAL & ENGINEERING NEWS Advertising Office: 430 Park Avenue N e w York 2 2 . N . Y .
Stresses physical principles and how these influence engineering design of shields. Discussion confined to reactors, betatrons, synchrotrons, and linear accelerators. Omits problems encountered in shielding of very high-energy accelerating machines. Mathematics and Wave Mechanics. R. H. ATKIN. xv + 348 pages. John Wiley & Sons, Inc., 440 Fourth Ave., New York 16, N. Y. 1957. $6.00. Concise treatment of the mathematics which the author feels necessary as a background for pursuit of the modern quantum theory.
Experimental Crystal Physics. W. A. WOOSTER. viii -f- 115 pages. Oxford University Press, 114 Fifth Ave., New York 11, N. Y. 1957. $2.90. Chemical Engineering in the Coal InDeals with simple experiments designed dustry. FORBES W. SHARPLEY, editor, v 4- 141 pages. Pergamon Press Inc., to teach students fundamentals of the sub122 East 55th St., New York 22, N. Y. ject. 1957. $8.50. Contains papers presented at International Research in Photosynthesis. H. GAFFRON, Conference organized by Great Britain's A. H. BROWN, C. S. FRENCH, R. LIVNational Coal Board held in June 1956 at INGSTON, E. I. RABINOWITCH, B. L. Cheltenham, England. STREHLER, AND N. E. TOLBERT, editors, xiv -f- 524 pages. Interscience PubRadiation Shielding. B. T . PRICE, C. C. lishers, Inc., 250 Fifth Ave., New York 1, N. Y. 1957. $12. HORTON, AJSTD K . T . SPINNEY. ix -\Based on papers and discussions given at 350 pages. Pergamon Press Inc., 122 the Gatlinburg Conference, Oct. 25-29, East 55th St., New York 22, N. Y. 1955. 1957. $10. 108
C &E N D EC. 2,
I 957
(Continued
from page 52)
• Epoxy resin c e m e n t , now made b y Smooth-On Mfg., is a two-component system. Just before use, a hardener is a d d e d to t h e epoxy resin which is mixed with aluminum and other m a terials to form a paste. T h e combination hardens at room temperature into a metallic solid which c a n be machined, t h e company says. T h e material is used with wood or metal as a bonding agent or as a filler. CIO • Henley & Co. is now marketing t o n lots of some new alkyl chlorides. T h e chemicals a r e : 1-chlorododecane, 1chlorotetradecane, 1-chlorohexadecane, 1-chloroctadecane, and 1-chloroicosane. C 11
• S a x o n b u r g Ceramics has developed a stabilized zirconia which can b e formed into rods, disks, tubes, crucibles, and special shapes. T h e material is very inert chemically a n d does n o t react when firing titanates or sintering metals, Saxonburg says. C1 2 • Dennis Chemical has developed t w o primers for fusing vinyl plastisols to metallic a n d nonmetallic surfaces. O n e is a white primer used t o form coatings which withstand cold or boiling water or high humidity, Dennis says. T h e other is a yellow primer and gives good resistance t o salt spray and salt water immersion, the company says. C 13
F u r t h e r useful i n f o r m a t i o n on keyed C h e m i c a l items m e n -Honed is r e a d i l y a v a i l a b l e . . . Use handy
coupon
on page
62
Patent Examiner Exams The U. S. Patent Office has a n e w examination for filling Patent Examiner positions located principally in W a s h ington, D. C . Positions are in the fields of engineering, including chemical a n d electrochemical, and other fields, including inorganic and organic chemistry. The announcement, N o . 130 B, a n d appropriate forms, available at local post offices and Civil Service regional and Washington, D . C , offices, should b e filed with t h e Executive Secretary, Board of U . S. Civil Service Examiners, Patent Office, Washington 2 5 , D . C.
