Resins polyox

Table 4. Aqueous Solution Viscosity Specifications for Polyox Resins ...

Polyox resin-grade Approx, mol Nominal resin Brookfield Speed, Viscosity at 25°C, Pa-s ... 

Typical Experiment. Polyox resin, Grade WSR-5M5, was transferred to a stainless steel hopper positioned over a vibrating feeder. The belt speed was set at 90 inches per minute, and the accelerator was adjusted (with the shutter closed) to deliver a current of 250 /xa. at 2 m.e.v. The shutter was opened, and the feeder was activated. The calculated dose was 0.75 megarad. After irradiation, the viscosity of each sample was measured. The average 5% aqueous solution viscosity for 27 samples of one particular blend was 78 7 cp., and the average for 16 samples of another was 80 =b 5 cp. 

Poly Ethylene Oxide) (PEO) Polymers. In the same family as PEG, but having higher molecular weights are POLYOX resins, which are water-soluble polymers. Because of their low melting point and unique swelling properties, coupled with the controlled rate of dissolution, POLYOX resins have been used to make sustained-release formulations by hot-melt extrusion.f ... 

Microbial Considerations Does not contain an antimicrobial as sold. Normal precautions need to be followed to include a preservative in a formulation containing Polyox Regulatory Status Three grades have been approved for use and sale by MHW in Japan (PEG-9M. PEG-14M, PEG-90M). All grades have been shown to be safe and are sold in the other major markets, including North America and Europe Special Comments Impart a great deal of lubricity to a solution. They are extremely mild and are excellent film formers. At high concentrations, Polyox resins can add adhesive properties to a product... 

Fig. 9. Melt flow index as a function of temperature for varying molecular weights of poly(ethylene oxide). WSR = Polyox water-soluble resins.

Only Japan and the United States have significant commercial faciUties for the production of poly(ethylene oxide) resins. In Japan, Meisei Chemical Works Ltd. produces Alkox and Sumitomo Seika Kagaky Co., Ltd., PEO. In the United States, Union Carbide Corp. produces Polyox. Precise figures have not been released on capacities or aimual production. 

Of the three worldwide manufacturers of poly(ethylene oxide) resins. Union Carbide Corp. offers the broadest range of products. The primary quaUty control measure for these resins is the concentrated aqueous solution viscosity, which is related to molecular weight. Specifications for Polyox are summarized in Table 4. Additional product specifications frequendy include moisture content, particle size distribution, and residual catalyst by-product level. 

Considerable interest has been shown ia poly(ethylene oxide) for diverse appHcations ia food, drug, and cosmetic products. Such uses fall within the scope of the Federal Food, Dmg, and Cosmetic Act. The U.S. FDA has recognized and approved the use of poly(ethylene oxide) for specific food and food packaging uses. USP/NF-grades of Polyox water-soluble resins (Union Carbide Corp.) are available for pharmaceutical appHcations. 

Polyox Water soluble resins Union Carbide... 

Union Carbide Corp. Technical literature Polyox water soluble resin, 1998. 

Union Carbide Corporation Sentry Polyox water soluble resin storage stability. Personal Communication, 1996. 

Polyox, Polyethylene oxide water-soluble resins. Union Carbide Corp. 

Trade Name Polyox Water Soluble Resins... 

POLYOX Water-Soluble Resin Control-Flow Cleaning Solutions. Union Carbide Corporation, Technical Brochure F-42934B. 

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