Vinyl acetate-ethylene copolymer emulsions prepared in the presence of a stabilizing system of a low molecular weight polyvinyl alcohol and a surfactant
AssigneeAir Products and Chemicals, Inc.
InventorsWilliam E. Lenney, John G. Iacoviello
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Abstract
A vinyl acetate-ethylene copolymer emulsion which is about 65-70% solids and has a viscosity of less than about 3,500 is disclosed. The emulsion is prepared by copolymerization of vinyl acetate and ethylene monomers in the presence of a stabilizing system consisting essentially of 2-4 wt %, based on vinyl acetate monomer, of a polyvinyl alcohol having a 100-600 degree of polymerization and 2-4wt %, based on vinyl acetate monomer, of a surfactant. Such emulsions demonstrate an improved speed of set as an adhesive.
Claims28
In a vinyl acetate-ethylene copolymer emulsion prepared by the aqueous emulsion copolymerization of vinyl acetate and ethylene monomers in the presence of a polyvinyl alcohol and a surfactant, the improvement which comprises a stable vinyl acetate-ethylene copolymer emulsion, the copolymer containing 60-95 wt% vinyl acetate and 5-40 wt% ethylene, the emulsion being about 65-70% solids, having a viscosity of less than about 3500 cps at 65% solids and prepared by aqueous emulsion copolymerization in the presence of a stabilizing system consisting essentially of 2-4 wt%, based on vinyl acetate monomer, of low molecular weight polyvinyl alcohol which has a 100-600 degree of polymerization and 1-4 wt%, based on vinyl acetate monomer, of a nonionic surfactant which is a polyethoxylated derivative of about 30-40 ethylene oxide units of (a) an alkyl phenol, the alkyl group containing 7-18 carbon atoms, or (b) a hydrophobic base formed by condensing propylene oxide with propylene glycol.
In a vinyl acetate-ethylene copolymer emulsion prepared by the aqueous emulsion copolymerization of vinyl acetate and ethylene monomers in the presence of a polyvinyl alcohol and a surfactant, the improvement which comprises a stable vinyl acetate-ethylene copolymer emulsion of about 65-70% solids having a viscosity of less than about 2500 cps at 65% solids and prepared by aqueous emulsion copolymerization in the presence of a stabilizing system consisting essentially of 2-4 wt%, based on vinyl acetate monomer, low molecular weight 75-99+ mole% hydrolyzed polyvinyl alcohol which has a 100-600 degree of polymerization and 1-4 wt%, based on vinyl acetate monomer, of a nonionic octyl- or nonylphenoxy poly(ethyleneoxy) ethanol surfactant having about 30-40 ethylene oxide units.
A stable vinyl acetate-ethylene copolymer emulsion comprising a stable aqueous colloidal dispersion of a copolymer containing 75-80 wt% vinyl acetate and 20-25 wt% ethylene prepared by the emulsion copolymerization of vinyl acetate and ethylene monomers in the presence of a stabilizing system consisting essentially of 2-4 wt%, based on a vinyl acetate monomer, low molecular weight 75-99+ mole% hydrolyzed polyvinyl alcohol which has a 100-600 degree of polymerization and 1-4 wt%, based on vinyl acetate monomer, of a nonylphenoxy poly(ethyleneoxy) ethanol having about 30-40 ethylene oxide units, the copolymer emulsion being about 65-70% solids and having a viscosity of less than about 1500 cps at 65% solids.
Dependencies are inferred from the claim text.