Protective colloid ethyl cellulose

Then, with a moderate stirring speed, add 4.00 g of Cellosize hydroxy-ethyl cellulose WP-300 (a protective colloid), 2.00 g of Tergitol NP-40, 2.60 g of Tergitol NP-15 (two nonionic surfactants), 2.20 g of Alcolac Siponate DS-4 (an anionic surfactant), an 0.40 g of ammonium bicarbonate. 

Acrylamido-2-methylpropanesulfonic acid protective colloid, acrylic/vinyl latex Ethyl hydroxyethyl cellulose protective colloid, adhesives Hydroxypropylcellulose Sodium polyacrylate protective colloid, aq. paints Methylcellulose protective colloid, baking Albumen... 

The initial period of 30 minutes refluxing produces some copolymer rich in MMA and the addition of the balance of the monomer mixture at a rate rqrproximating to that of the polymerisation ensures a random copolymer approximating 73% by weight of VA is formed. The use of a protective colloid (hydroxy ethyl cellulose) is partially responsible for the larger particle size compared to the methyl methacrylate homopolymer in the previous example. 

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