Patent ID: 6616798
Filing Date: 2003-09-09
Classification: C08F,C08L,C09J

Abstract:
A process for preparing adhesives having improved adhesion, in the form of their aqueous dispersions or water-redispersible dispersion powders, by emulsion polymerization in the presence of polyvinyl alcohol with or without drying of the dispersion obtainable by this process, which comprises polymerizing a comonomer mixture comprisinga) predominant monomers consisting essentially of from 30 to 95 weight percent vinyl acetate monomer and optionally from 60 to 1 weight percent ethylene monomer, said weight percents based on the total weight of all monomers b) from about 2.5 to about 20.5% by weight, based on the overall weight of the comonomer mixture, of vinyl esters of alpha-branched tertiary monocarboxylic acids of 11 carbon atoms, in the presence of c) from 0.1 to 15% by weight, based on the overall weight of monomers, a) and b) of polyvinyl alcohol, said adhesive having a Tg in the range of about âˆ’30Â° C. to 40Â° C.