Suspending agents hydroxyethyl cellulose

Cellulose ethers, more particularly methyl cellulose (MQ, methylhydroxypro-pyl cellulose (MHPC) and hydroxypropyl cellulose (HPC) are used as protective colloids also called primary suspending agents in suspension polymerization for the manufacturing of S-PVC. Their role is maintaining the particle size of the resin. Hydroxyethyl cellulose (HEC) is preferred for manufacturing of vinyl acetate emulsion polymers and as a thickening agent in dispersimi paints. [Pg.115]

Typical suspending agents for the vinyl acetate polymerization are poly(vinyl alcohol) [particularly a grade represented as approximately 88% hydrolyzed poly(vinyl acetate)], gum arabic, hydroxyethyl cellulose, methyl cellulose, starches, sodium polyacrylate or sodium polymethacrylate, gelatin, and an equimolar copolymer of styrene and maleic anhydride neutralized with either sodium hydroxide or aqueous ammonia. Water-insoluble dispersing agents or... [Pg.241]

To prevent sedimentation or creaming, one needs to add suspending agents in the continuous phase. Such agents are usually high molecular weight polymers (such as hydroxyethyl cellulose or xanthan gum), usually referred to as thickeners. [Pg.436]

Uses Emulsifier, hydrotrope, emollient, thickener in pharmaceuticals skin conditioner and emollient in cosmetics Manuf./Distrib. Biosynth AG Chemos GmbH Cetyl hydroxyethyl cellulose Definitien Ether of cetyl alcohol and hydroxyethylcellulose Uses Film-former, associative thickener, stabilizer, vise, stabilizer, binder, suspending agent, moisture barrier for cosmetics and pharmaceuticals costabilizer for emulsions... [Pg.2033]