Vinyl acetate ethylene emulsions stabilized with poly(ethylene/poly (vinyl alcohol) blend
AssigneeAir Products Polymers, L.P.
InventorCarrington Duane Smith
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Abstract
The present invention provides for the production of stable aqueous dispersions of vinyl acetate-ethylene copolymers, preferably at high solids, i.e., greater than 65 wt %, preferably >70% which are useful as adhesives. The vinyl acetate-ethylene copolymer is comprised of polymerized units of vinyl acetate and ethylene in approximately 60-95 wt % and 5-40 wt % respectively. The copolymers are prepared by the emulsion copolymerization of vinyl acetate and ethylene monomers in the presence of a stabilizing system consisting essentially of (1) a poly(vinyl alcohol) which is 75-99+mole % hydrolyzed and has an average degree of polymerization ranging from 100-2200 and (2) a polyethylene glycol having a number average molecular weight of from 200 to 20,000.
Claims7
In a process for producing a vinyl acetate-ethylene copolymer emulsion comprising an aqueous colloidal dispersion of a copolymer containing 50-95 wt % vinyl acetate and 5-50 wt % ethylene prepared by the emulsion copolymerization of vinyl acetate and ethylene monomers in the presence of a poly(vinyl alcohol), the improvement for producing a vinyl acetate-ethylene copolymer emulsion having a solids content of from 65% to 75% by weight which comprises:
- polymerizing said vinyl acetate and ethylene monomers in the presence of a stabilizing system consisting essentially of a poly(vinyl alcohol) which has degree of polymerization 100 to 2200 and a polyethylene glycol having a number average molecular weight of from 200 to 20,000.
Dependencies are inferred from the claim text.