Patent ID: 8114947

Claim:
A method of polymerization comprising contacting the components of a polymerizable composition comprising in one part an organoboron compound comprising an organoboron amine complex and in the second part one or more compounds capable of free radical polymerization and a cure accelerator comprising (a) at least one substituted or unsubstituted benzoquinone present in an amount of about 0.02 to about 0.4 percent by weight of the two part composition and a decomplexing agent capable of decomplexing the organoboron amine complex upon contacting of the two parts, wherein the cure accelerator is located only in the second part and wherein the parts of the composition prior to contacting of the two parts exhibit a viscosity increase of less than 150 percent over 30 days when stored at 40° C. or less and the polymerizable composition exhibits a lap shear strength according to ASTM 03165-91 of 50 psi or greater 2 hours after contacting and application to a polypropylene substrate: wherein: the organoboron compounds comprise a complex of trialkyl borane and a compound having a primary amine and one or more hydrogen accepting grows, wherein the one or more hydrogen bond accepting groups is selected from ether or polyether, and there are at least two carbon atoms between primary amine and the hydrogen bond accepting groups, wherein the compound having a primary amine and one or more hydrogen accepting groups is selected from the group of consisting of methoxypropylamine, methoxybutylamine, methoxyethylamine, ethoxypropylamine, propoxypropylamine, and amine terminated polyalkylene ethers: and the compounds capable of free radical polymerization comprise acrylate or methacrylate monomers, polymers or a mixture thereof.