Hydroxybutyl methyl cellulose

In VCM suspension polymerisation, water and liquid VCM in approximately equal phase volumes are stirred together with a water-soluble polymer such as a partially hydrolysed polyvinyl acetate (PVA) or a substituted cellulose eg hydroxypropyl cellulose, hydroxybutyl methyl cellulose, ethyl hydroxyethyl cellulose. The droplet size distribution obtained is the result of two competing processes, droplet break-up and coalescence break-up occurs in the turbulent shear field around the impeller tip, coalescence in the regions of the reactor which are distant from the impeller. This process continues until some equilibrium droplet size distribution is obtained this determines the initial size of polymerising droplets. The initial droplet size distribution depends on (a) stirrer type (b) stirrer speed (c) reactor configuration and position of stirrer in the reactor (d) nature and concentration of water-soluble polymeric additives. 

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... 

Synonyms Cellulose, hydroxybutyl methyl ether Definition Butylene glycol ether of methylcellulose Uses Binder, emulsion stabilizer, film-former, vise, control agent in cosmetics Manuf./Distrib. Aldrich http //www.sigma-aidrich.com... 

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