that the initial vinyl acetate monomer concentration in the reactor prior to initiation was about 60 the vinyl acetate content at the end of 1 hour should be approximately 40 20 at the end of second hour and less than 1 at the end of third hour based on this conversion rate of vinyl acetate the crosslinkable monomer was added to the reaction mixture at a rate such that all of the monomer would be added to the reactor by the time the unreacted vinyl acetate monomer content in the emulsion was from 3 to 8 by weight the monomer in runs 1 to 16 were in the 3 to 8 vinyl acetate content range runs 17 and 18 were about 20 vinyl acetate content this level is reached in about 21 2 hours thus the crosslinkable monomer was added at a uniform rate u00b1 50 preferably 120 for 21 2 hours polymerization was carried out using an activator solution consisting of zinc formaldehyde sulfoxylate about 7 by weight and a catalyst system consisting of a peroxide e g t butyl hydroperoxide or 2 hydrogen peroxide the grams hydrogen peroxide added per reaction was about 19 to 22 grams for recipes one.