Patent ID: 7323078

Claim:
A method of preparing a cured bonded composite; wherein said cured bonded composite comprises two or more substrates bonded together with an interposed bonding composition; wherein said method comprises the steps of: a) applying onto a first substrate, a prepolymer composition, wherein said prepolymer composition comprises, in weight percent, based on the weight of said prepolymer composition: (i) from 15% to 70% of at least one uncurable polyester resin, wherein said uncurable polyester resin is the reaction product of reacting one or more hydrocarbon having two or more hydroxyl groups with one or more polycarboxylic acid that is aliphatic, cyclic aliphatic, or aromatic, wherein said resin contains fewer curable reactive groups than 0.01 mole/kg of resin, wherein said resin has number-average molecular weight of 6,500 or less, and wherein said resin has acid value of 2 mg KOH/g of resin or greater; and (ii) from 30% to 85% of a least one polymerizable compound; b) contacting a second substrate with said prepolymer composition to provide an uncured composite, wherein said prepolymer composition is in contact with said first substrate and said second substrate; and c) subjecting said uncured composite to electron beam radiation to provide said cured bonded composite; wherein each said polymerizable compound in said prepolymer composition is a monomer or oligomer selected from the group consisting of alkyl esters of (meth)acrylic acid, hydroxyl containing esters of(meth)acrylic acid, ring containing esters of (meth)acrylic acid, esters of(meth)acrylic acid containing ethylene oxide, esters of (meth)acrylic acid containing glycidyl groups, esters of (meth)acrylic acid with polyols, adducts of acrylic compounds with epoxy compounds, adducts of acrylic compounds with phosphate compounds, acrylic oligomers, ethylenically unsaturated compounds other than (meth)acrylate compounds, and mixtures thereof; and wherein said prepolymer composition is capable of being applied onto a substrate by one or more of roll coating, rod coating, gravure, or Meyer bar, and wherein said prepolymer composition contains no solvent.