Hygroscopic cellulose ether

Hydroxypropyl methyl-ceUulose phthalate (HPMCP) Cellulose ethers anionic 137 °C (for HP-50) 133 °C (for HP-55) 80,000- 130,000 Above pH 5.0 Hygroscopic 28 185 °C Hot melt extrusion Spray drying... 

By the action of relatively small quantities of sodium chloroacetate on alkali cellulose, carboxymethyl ethers are obtained which give smooth solution in dilute alkali but which can be regenerated to give threads or films of high tensile strength. These products are relatively hygroscopic. The substances are soluble in the form of their sodium salts and form insoluble salts with many metals.8... 

Carboxymethylcellulose Calcium (Calcium CMC) A calcium salt of polycar-boxymethyl ether of cellulose, calcium CMC is obtained by carboxymethylation of cellulose and conversion into calcium salt. Different molecular grades are prepared by changing the degree of carboxymethylation. It is available as a line powder, white to yellowish white in color, and hygroscopic in nature. Calcium CMC has swelling and viscosity-enhancing properties in water. It can swell twice its volume in water [25]. 

Methanol[67-56-l] (methyl alcohol) is a clear, colorless liquid with a characteristic odor. It is hygroscopic and miscible in all proportions with water as well as with many organic solvents. It is less soluble in fats and oils, and is only partially miscible with aliphatic hydrocarbons. Numerous inorganic substances (e.g., many salts) are soluble in methanol. Methanol has a good solvency for polar resins, cellulose nitrate, and ethyl cellulose. However, oil-modified alkyd resins and polymers, with the exception of poly(vinyl acetate), poly(vinyl ethers), polyvinylpyrolidone and polymethacrylamide, are insoluble. 

Ethyl triglycol [112-50-5] [2-(2-ethoxyethoxy)ethoxy]ethanol, triethylene glycol monoethyl ether] is an almost colorless, neutral, mild-smelling liquid with a low hygroscopicity. It is soluble in water and most organic solvents, but is only partially miscible with aromatic and aliphatic hydrocarbons. Ethyl triglycol dissolves cellulose nitrate, shellac, colophony, ketone resins, maleate resins, chlorinated rubber, alkyd resins, and many other paint resins. It does not dissolve cellulose acetate, poly(vinyl chloride), vinyl chloride copolymers, fats, oils, and rubber. 

Further, aramid paper is less hygroscopic than cellulose paper [40]. However, a poly(ether imide) paper absorbs less water than a conventional aramid paper [41]. Therefore, especially under humid conditions, a poly(ether imide) paper is superior to an aramid paper. 

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