Hydroxyethyl celluloses

Some part of the cellulose fraction is redirected to make cellulose derivatives, such as cellulose acetate, methyl and ethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose. These derivatives find multiple applications, for instance, as additives in current products (e.g., paints, lacquers) of chemical industry. Typically, the preparation of cellulose derivatives takes place as a two-phase reaction cellulose is pretreated, for example, with alkali, and a reagent is added to get the substitution. Usually no catalyst is needed [5]. 

Hydrazine gel compns contg fuel metals (such as Al, Mg, Be, etc), microdimensional fibers (such as glass, asbestos, cellulose or synthetic) and thickeners, such as polyacrylamide, Na CM-cellulose, hydroxyethyl-cellulose, poly(vinyl)aIc, poly(Me methacrylate). Thus a soft gel was prepd. It contained hydrazine 65.20, polyacrylamide 0.67, microglass fibers 0.80 Al powder 33 33%... 

Methyl cellulose Ethyl cellulose Hydroxyethyl cellulose Hydroxypropyl cellulose Hydroxyethylmethyl cellulose Hydroxypropylmethyl cellulose Carboxymethyl cellulose sodium Cellulose acetate Cellulose acetate butyrate Cellulose acetate propionate Cellulose acetate phthalate Hydroxypropylmethyl cellulose phthalate... 

A slightly different approach is to deliver the active drug in a dry powder carrier system, for example microcrystalline cellulose, hydroxyethyl starch, cross-linked dextran, microcrystalline chitosan, carbomer, pectin, or alginic acid. The polymer absorbs water upon contact with the nasal mucosa and swells to become a viscous gel, often demonstrating bioadhesive properties. Such systems can remain in the nasal cavity for as long as six hours. For example, the bioavailability in rats of the somatostatin analogue, octreotide, was shown to be enhanced by the co-administration of alginic acid and cross-linked dextran as dry powders. 

Cellosize HEC cellulose hydroxyethyl ether cellulose hydr-oxyethylate ethylhydroxy cellulose ethylose HEC HE cellulose 2-hydroxyethyl cellulose ether hydroxyethyl ether cellulose hydroxyethyl starch hyetellose Natrosol oxycellu-lose Tylose PHA. 

Cellulose derivatives (methyl cellulose, hydroxyethyl cellulose, etc.) and starch derivatives are more useful binders. 

Of cellulose ethers only ethyl cellulose has found application as a molding material. Methyl cellulose, hydroxyethyl cellulose, and sodium carboxymethyl cellulose are usefiil water-soluble polymers. The first step in the manufacture of each of these materials is the preparation of alkali cellulose (soda cellulose) by treating cellulose with concentrated sodium hydroxide. Ethyl cellulose is made by reacting alkali cellulose... 

Cellulose hydroxyethylate Cellulose hydroxyethyl ether Cellulose, 2-hydroxyethyl ether. See Hydroxyethylcellulose Cellulose, 2- hydroxyethyl methyl ether. See Methyl hydroxyethylcellulose... 

Hydroxyethyl cellulose Hydroxyethyl cellulose ether 2-Hydroxyethyl cellulose ether. See Hydroxyethylcellulose... 

Cellulose, hydrogen sulfate, sodium salt. See Sodium cellulose sulfate Cellulose, hydroxybutyl methyl ether. See Hydroxybutyl methylcellulose Cellulose hydroxyethylate Cellulose hydroxyethyl ether Cellulose, 2-hydroxyethyl ether. See Hydroxyethylcellulose Cellulose, 2-hydroxyethyl 2-hydroxy-3-(trimethylammonio) propyl ether, chloride. See Polyquatemium-10... 

Hydroxyethyl cellulose Hydroxyethyl cellulose ether 2-Hydroxyethyl cellulose ether. See Hydroxyethylcellulose Hyd roxyet hy I cel I u I ose-2-hyd roxyp ro py I trimethyl ammonium chloride ether. See Polyquaternium-10 Hydroxyethyl cetyidimonium chloride CAS 24625-03-4 EINECS/ELINCS 246-369-3 Synonyms Ammonium, hexadecyl (2-hydroxyethyl) dimethyl-, chloride Cetyl dimethyl hydroxyethyl ammonium chloride Dimethyl hydroxyethyl cetyl ammonium chloride Hexadecyl (2-hydroxyethyl) dimethyl ammonium chloride Quaternium-44 Classification Quaternary ammonium salt Empirical C20H44NO Cl Formula [CH3(CH2)i5N(CH3)2CH2CH20H] Cl" Uses Antlstat, surfactant in cosmetics Hydroxyethyl cetyidimonium phosphate CAS 85563-48-0 EINECS/ELINCS 287-619-1 Synonyms Cetyl dimethyl hydroxyethyl ammonium phosphate Hexadecyl (2-hydroxyethyl) dimethylammonium dihydrogen phosphate... 

Cellulose thickeners n. Aqueous thickeners based on cellulose compounds such as car-boxymethyl cellulose, hydroxyethyl cellulose, and methyl cellulose. 

See the following cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cellulose esters, cellulose nitrate, cellulose triacetate, ethyl cellulose, hydroxyethyl cellulose, and regenerated cellulose. 

Ethyl cellulose Hydroxyethyl cellulose Hydroxypropyl cellulose Methyl cellulose Cellulose acetate Hydroxypropylmethyl cellulose Hydroxybutylmethyl cellulose Hydroxyethylmethyl cellulose Ethylhydroxyethyl cellulose Cellulose xanthate... 

Cellulose acetate—Butyrate Nitrocellulose Methyl cellulose Ethyl cellulose Hydroxyethyl cellulose Hydroxypropyl methyl cellulose... 

Cellulose derivatives Carboxymethyl cellulose, Hydroxyethyl ellulose, Hydroxypropyl cellulose. Methyl cellulose, Microcrystalline cellulose... 

Cellulose, an almost linear polymer of hydroglucose, is the most abimdantly occurring natural polymer on earth. Films made from cellulose derivatives tend to be water soluble, resistant to fats and oils, tough, and flexible (Baldwin, Nisperos, Hagenmaier, Baker, 1997 Cutter, Sumner, 2002 Krumel, Lindsay, 1976). A number of cellulose derivatives are produced commercially, most commonly carboxy-methyl cellulose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and cellulose acetate (CA). Of these derivatives, only CA is widely used in packaging of baked goods and fresh produce. Cellulosic derivatives such as hydroxy propyl... 

Methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, caiboxymethyl cellulose, ethylhydroxyethyl cellulose, methylhydroxypropyl cellulose... 

Carboxymethyl cellulose, hydroxyethyl cellulose and calcium alginate... 

Hydroxyalkyl ether cellulose [hydroxyethyl- (HEC) and hydroxypropyl cellulose (HPC)] are prepared in a different way. They use the capability of the alkoxide groups of alkali-cellulose to undergo a nucleophilic substitution when reacted with oxiranes ... 

Trade Names Natrosol 250 HHR CS Natrosol 250 HR Natrosol 250 HR CS Trade Names Containing Dow Corning Antifoam 1410 2-Hydroxyethyl cellulose Hydroxyethyl cellulose ether 2-Hydroxyethyl cellulose ether. See Hydroxyethylcellulose Hydroxyethylcellulose-2-hydroxypropyl trimethyl ammonium chloride ether. 

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