ADHESIVE COMPOSITIONS
An adhesive composition comprises an aqueous dispersion of a polymer comprising at least one vinyl ester of a carboxylic acid having up to 20 carbon atoms; and a plasticizer comprising an ester of a polyol and a linear or branched aliphatic monocarboxylic acid having 3 to 20 carbon atoms in the molecule.
1 . An adhesive composition comprising an aqueous dispersion of a polymer produced from a monomer composition comprising at least one vinyl ester of a carboxylic acid having up to 20 carbon atoms; and a plasticizer comprising an ester of a polyol and an aliphatic monocarboxylic acid having 3 to 20 carbon atoms.
2 . The adhesive composition of claim 1 , wherein the polyol is selected from the group consisting of ethylene glycol, 1,2-propylene glycol, and oligomers thereof.
3 . The adhesive composition of claim 1 , wherein the polyol is selected from the group consisting of di-, tri-, and tetra-ethylene glycol, dipropylene glycol, tripropylene glycol, and tetraethylene glycol.
4 . The adhesive composition of claim 1 , wherein the plasticizer comprises an ester of a polyol and an aliphatic carboxylic acid selected from the group consisting propionic acid, n-butyric acid, isobutyric acid, n-pentanoic acid, 2-methylbutyric acid, 3-methyl butyric acid, 2-methyl-pentanoic acid, n-hexanoic acid, 2-ethylbutyric acid, n-heptanoic acid, 2-methyl-hexanoic acid, cyclohexanecarboxylic acid, 2-ethylhexanoic acid, n-nonanoic acid, 2-methyloctanoic acid, isononanoic acid, 3,5,5-trimethyl hexanoic acid, 2-propyl heptanoic acid, 2-methylundecanoic acid, isoundecane carboxylic acid, tricyclodecanecarboxylic acid, and isotridecane carboxylic acid.
5 . The adhesive composition of claim 1 , wherein the plasticizer comprises an ester of a polyol and a substituted or unsubstituted hexanoic acid.
6 . The adhesive composition of claim 1 , wherein the plasticizer comprises one or more of triethylene glycol di-2-ethylhexanoate, tetraethylene glycol di-n-heptanoate, triethylene glycol di-2-ethyl butyrate, triethylene glycol di-n-heptanoate, and tetraethylene glycol di-2-ethylhexanoate.
7 . The adhesive composition of claim 1 , wherein the adhesive composition comprises up to 10% plasticizer by weight of the polymer, preferably from 3 to 7% plasticizer by weight of the polymer.
8 . The adhesive composition of claim 1 , wherein the polymer dispersion is produced by emulsion polymerization.
9 . The adhesive composition of claim 1 , wherein the polymer dispersion comprises a stabilizer, preferably a polyvinyl alcohol stabilizer.
10 . The adhesive composition of claim 1 , wherein the at least one vinyl ester is selected from the group consisting of vinyl formate, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl valerate, vinyl-2-ethyl-hexanoate, vinyl isooctanoate, vinyl nonate, vinyl decanoate, vinyl pivalate, vinyl versatate, and mixtures thereof.
11 . The adhesive composition of claim 1 , wherein the at least one vinyl ester comprises vinyl acetate.
12 . The adhesive composition of claim 1 , wherein the monomer composition further comprises one or more co-monomers selected from C 1 -C 20 -alkyl (meth)acrylates, vinyl-aromatic compounds having up to 20 carbons, ethylenically unsaturated nitriles, vinyl halides, vinyl ethers of C 1 -C 10 alcohols, and C 2 -C 8 aliphatic hydrocarbons with 1 or 2 double bonds.
13 . The adhesive composition of claim 1 , wherein the polymer comprises a vinyl ester-ethylene copolymer.
14 . The adhesive composition of claim 1 , wherein the monomer composition further comprises one or more auxiliary co-monomers selected from unsaturated organic acids comprise ethylenically unsaturated carboxylic acids and anhydrides and amides thereof, ethylenically unsaturated sulfonic acids and salts thereof, and ethylenically unsaturated phosphonic acids and salts thereof.
15 . A packaging adhesive comprising the adhesive composition of claim 1 .