Polyamide Resin Series Developed by General Mills
Single compact unit for most metering and feeding requirements...
Versalon resins combine best features of thermoplastic and thermosetting resin systems
check these features
of the new
DURRUM 12-CHANNEL LIQUID PUMP • Compact — the Durrum Dial-A-Pump, Model 12AP, provides the versatility and capacity of 12 separate pumping channels in just 12" of bench space. • Each channel is individually and continuously adjustable over a range of 0-4,000 ml/hour. • Wide range of applications — ideal for feeding of multiple chromatography columns,mixing of liquids and slurries, perfusion studies, and proportioning chemical streams. • Handles virtually all your liquid pumping requirements with one unit costing only $750. For more information, contact your nearest representative of Van Waters & Rogers, Inc. or Fisher Scientific Company. Or write for Bulletin 12AP.
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Corporation 925 E. Meadow Drive Palo Alto · California
58
C&EN
NOV.
25,
1963
A series of resins, claimed to combine the application ease of thermoplastic systems with the high strength and toughness of thermosetting systems, has been introduced by the Chemical Division of General Mills, Kankakee, 111. The resins are polyamides. Known as Versalon resins, they have much higher elongations than the firm's older Versamid line. The new resins have significant chemical differences from the Versamid resins, but General Mills will give no details. The Versalon resins are expected to have much wider application than the older polyamide line. Major uses for the Versalon resins will be as adhesives and coatings. When used as hot-melt adhesives, they develop tensile strengths up to 2600 p.s.i. within one or two seconds, the firm claims. General Mills points out that this property is already attracting interest from the shoemaking industry. Methods and equipment for applying the new resins have been developed through cooperation with International Shoe Machine Corp., Boston, Mass. Properties. According to General Mills, the outstanding properties of the new resins are toughness, flexibility, adhesion, and low water adsorption. These qualities are built into the Versalon resin molecule. Because of the high strength and flexibility inherent in the resin structure, limited success has been achieved in improving properties of the resins by the addition of plasticizers. However, work in this direction is far from complete, General Mills adds. A considerable range of properties is offered by the series. Elongation can vary between 100 and 700%. Tensile strength varies between 1000 and 2600 p.s.i., and softening point can range from 100° to 200° C. General Mills expects uses in addition to shoemaking in the construction, automotive, appliance, canning, packaging, and furniture industries. Good electrical properties make the Versalon resins suitable for potting and encapsulating electrical parts, according to the firm.
Currently, three Versalon resins are being produced in semiworks facilities at Kankakee. Full-scale production is scheduled for early next spring. Further resins will be added to the series as research into potential uses continues. The Versalon resins are for sale to industrial consumers, are priced at $1.25 per pound delivered. C1
Antibacterial Agent Introduced by Olin A group of chemicals, called Omadine, has been developed by Olin Mathieson Chemical Corp. as antibacterial and antifungal agents. Chemically identified as l-hydroxypyridine-2thione, Omadine, in the form of its salts, is unusual because of its effectiveness in small quantities, the New York, N.Y., firm says. Two Omadine derivatives are currently available in commercial quantities. Zinc Omadine and sodium Omadine are expected to find their greatest potential in personal care products; in the pharmaceutical, paint, textile, and plastics industries; and in hospitals, according to Olin. Zinc Omadine makes it possible to make a white soap with antibacterial properties. Most bactericides now used in some soaps impart color, according to Olin. The firm adds that zinc Omadine is currently being tested in hospitals as a disinfectant to deter spread of staphylococci and other resistant germs, in soap used by surgeons before operating, and in rubber sheeting. Completed tests indicate that soap with 0.07% suspension of zinc Omadine reduces bacteria on hands 27.6% more effectively than untreated soap after three days of normal use, Olin says. Other lab tests with zinc Omadine have shown the material effective as a preventive in water-based paints and in asphalt-emulsion paints to reach low bacterial counts, and in paper products for boxes, cartons, and bags to resist mold. Both zinc and sodium Omadine are available in a crystalline solid form. Zinc Omadine is also available in a white, water dispersion. In solution, sodium Omadine is colorless. The sodium form is used where a clear product is desired. It is also used where greater solubility is desired. However, zinc Omadine has a longer effective life, Olin says. C2
LABORATORY REPORT FROM ^
h'l-A
OXIDES DIVISION, DEPT. CENK
CABOT
CORPORATION
125 HIGH STREET, BOSTON 10, MASSACHUSETTS
How to improve product performance with minute inert particles
EFFECT OF SHEAR ON THE VISCOSITY OF A CAB-O-SIL THICKENED POLYESTER RESIN 5,000
2,000 1,000
CAB-O-SIL can measurably add to the performance of many products. For example: 0.5% will turn sulfur into a free flowing powder . . . addition of only 0.5 - 2.0% to paint increases viscosity, improves pigment dispersion and lengthens shelf life . . . 5 - 7 pph added to butyl rubber cable covering yields rapid, uniform extrusions . . . 2% added to the thixotropic plastisol in which bowling pins are dipped assures uniform, heavy coatings.
500 CO
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100 50
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