abstract heat resistance binders for flexible polyester webs may be prepared using an emulsion polymer the polymer being prepared by a two stage polymerization procedure wherein a first stage is prepared based on a relatively low tg ethylene vinyl acetate polymer and a second stage higher tg polymer thereby combining the advantageous flexibility and film forming properties of the ethylene vinyl acetate copolymer with the stiffness and heat resistance of the higher tg copolymer application_number US 24276388 A description the two stage polymerization utilized herein may be carried out using a variety of specific modifications which are generally referred to as producing 34 core shell 34 or 34 interpenetrating network 34 type polymers such polymerization procedures are described for example in u s pat nos 3 671 610 3 833 404 and 4 616 057 the disclosures of which are incorporated herein by reference more specifically an ethylene vinyl acetate polymer containing both pre and post crosslinking monomers is prepared using conventional batch semi batch or continuous emulsion polymerization procedures such as taught in u s pat nos 2 754 280 2 795 564 and 3 732 184 the amounts of ethylene and vinyl acetate may vary within a range of about 10 to 25 by weight ethylene and 70.