Pressure sensitive adhesive containing polymerized alkoxyalkyl ester of unsaturated carboxylic acid
AssigneeRohm and Haas Company
InventorsFrank Thomas Sanderson, Alexander Kowalski, Roger H. Kottke
Life of this patent
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Abstract
The pressure sensitive adhesive of this invention has improved shear resistance while still having good tackiness and stability in a humid atmosphere, it is prepared by solution polymerization, or by other methods, and has carboxylic acid groups therein, an alkoxyalkyl ester of an unsaturated carboxylic acid, an hydroxyalkyl ester of an unsaturated carboxylic acid having at least one hydroxyl functionality and, in many cases, an alkyl acrylate or an alkyl methacrylate. A crosslinker may be used, and the adhesive cured by heat, without destroying the proper relationship of tack and shear resistance.
Claims11
A water-insoluble pressure sensitive adhesive in the form of a dry film, an organic solvent solution, an aqueous dispersion, or a nonaqueous dispersion, containing a polymer, a dry film of which is tacky, the polymer containing, in parts by weight, of about 5% to 99.5% of an alkoxyalkyl ester of an .alpha.,.beta.-unsaturated acid, the alkoxyalkyl group having the structure --(--R.sub.1 --O--).sub.n --R.sub.2 wherein R.sub.1 is alkylene having 1 to 4 carbon atoms and R.sub.2 is alkyl having 1 to 4 carbon atoms, n being from 1 to 4, about 0.25% to 20% of an .alpha.,.beta.-unsaturated acid, selected from the group consisting of itaconic acid and .alpha.,.beta.-unsaturated monocarboxylic acids, about 0.5% to 20% of an hydroxyalkyl ester of an .alpha.,.beta.-unsaturated carboxylic acid having at least one hydroxyl functionality, and 0% to 94.5% of at least one of an alkyl acrylate having from 2 to 12 carbon atoms in the alkyl group and an alkyl methacrylate having an average of from 6 to 14 carbon atoms in the alkyl group, and optionally one or more of an ester of acrylic acid having 1 or 13 to 20 carbon atoms in the alkyl group and an ester of methacrylic acid having 1 to 4 or 15 to 20 carbon atoms in the alkyl group, said polymer having a Tg of below about -15.degree. C., the total parts being 100.
A water-insoluble pressure sensitive adhesive in the form of a dry film, an organic solvent solution, an aqueous dispersion, or a nonaqueous dispersion, containing a polymer, a dry film of which is tacky, consisting of, in parts by weight, of about 5% to 99.5% of an alkoxyalkyl ester of an .alpha.,.beta.-unsaturated acid, the alkoxyalkyl group having the structure --(--R.sub.1 --O--).sub.n --R.sub.2 wherein R.sub.1 is alkylene having 1 to 4 carbon atoms and R.sub.2 is alkyl having 1 to 4 carbon atoms, n being from 1 to 4, about 0.25% to 20% of an .alpha.,.beta.-unsaturated acid, selected from the group consisting of itaconic acid and .alpha.,.beta.-unsaturated monocarboxylic acids, about 0.5% to 20% of an hydroxyalkyl ester of an .alpha.,.beta.-unsaturated carboxylic acid having at least one hydroxyl functionality, and 0% to 94.5% of an alkyl acrylate having from 2 to 12 carbon atoms in the alkyl group or an alkyl methacrylate having an average of from 5 to 16 carbon atoms in the alkyl group, optionally with 0% to 50% of other acrylates or methacrylates having alkyl groups with 1 to 20 carbon atoms, styrene, vinyl toluene, acrylamide, methacrylamide or n-methylolacrylamide, said polymer having a Tg of below about -15.degree. C., the total parts being 100.
A water-insoluble pressure sensitive adhesive in the form of a dry film, an organic solvent solution, an aqueous dispersion, or a nonaqueous dispersion, containing a polymer, a dry film of which is tacky, the polymer containing, in parts by weight, of about 5% to 99.5% of an alkoxyalkyl ester of an .alpha.,.beta.-unsaturated acid, the alkoxyalkyl group having the structure --(--R.sub.1 --O--).sub.n --R.sub.2 wherein R.sub.1 is alkylene having 1 to 4 carbon atoms and R.sub.2 is alkyl having 1 to 4 carbon atoms, n being from 1 to 4, about 0.25% to 20% of an .alpha.,.beta.-unsaturated acid, selected from the group consisting of itaconic acid and .alpha.,.beta.-unsaturated monocarboxylic acids, about 0.5% to 20% of an hydroxyalkyl ester of an .alpha.,.beta.-unsaturated carboxylic acid having at least one hydroxyl functionality, and 0% to 94.5% of an alkyl acrylate having from 2 to 12 carbon atoms in the alkyl group or an alkyl methacrylate having an average of from 5 to 16 carbon atoms in the alkyl group, said polymer having a Tg of below about -15.degree. C., the total parts being 100.
A dry, tacky film of a water-insoluble pressure sensitive adhesive containing a polymer, consisting of, in parts by weight, of about 5% to 99.5% of an alkoxyalkyl ester of an .alpha.,.beta.-unsaturated acid, the alkoxyalkyl group having the structure --(--R.sub.1 --O--).sub.n --R.sub.2 wherein R.sub.1 is alkylene having 1 to 4 carbon atoms and R.sub.2 is alkyl having 1 to 4 carbon atoms, n being from 1 to 4, about 0.25% to 20% of an .alpha.,.beta.-unsaturated acid, selected from the group consisting of itaconic acid and .alpha.,.beta.-unsaturated monocarboxylic acids, about 0.5% to 20% of an hydroxyalkyl ester of an .alpha.,.beta.-unsaturated carboxylic acid having at least one hydroxyl functionality, and 0% to 94.5% of an alkyl acrylate having from 2 to 12 carbon atoms in the alkyl group or an alkyl methacrylate having an average of from 5 to 16 carbon atoms in the alkyl group, optionally with a minor proportion of other acrylates or methacrylates, styrene, vinyl toluene, acrylamide, methacrylamide, or n-methylolacrylamide, said polymer having a Tg of below about -15.degree. C., the total parts being 100.
Dependencies are inferred from the claim text.