Transparent two-part acrylic adhesive composition and the method of use thereof

In a curable two-part adhesive composition wherein one part comprises a polymerizable acrylic monomer and an effective amount of a stabilized organoboron amine complex initiator of the formula:

• ##STR6## where R, R.sub.1 and R.sub.2 are alkyl of 1 to 10 carbon atoms or phenyl, R.sub.3 and R.sub.4 are hydrogen or alkyl of 1 to 10 carbon atoms;
• or ##STR7## where R.sub.5 and R.sub.6 are hydrogen or alkyl of 1 to 10 carbon atoms, m is 2 to 10 and n is 1 to 6;
• and the second part contains an effective destabilizing amount of an organic acid activator having the formula:
• R--COOH
• where R is H, alkyl or alkenyl of 1 to 8 carbon atoms or aryl of 6 to 10 carbon atoms, the improved composition providing a transparent or clear bond in the cured adhesive wherein the acrylic monomer comprises about 45% or more by weight, based on the total weight of acrylic monomer in the composition, of a monomer selected from the group consisting of benzyl acrylate or methacrylate, 2-phenoxyethyl acrylate or methacrylate, phenyl acrylate or methacrylate and 2-phenylethyl acrylate or methacrylate.