Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1975-06-13
1976-11-30
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156310, 156331, 156314, 156332, 156330, 260830P, 260901, 260859R, 428416, 428425, 428424, B29D 2310, B32B 700
Patent
active
039947645
ABSTRACT:
Improved, fast curing adhesives, with and without fillers, and articles bonded therewith are provided. The adhesive comprises a first part made up of a thermoplastic, non-reactive polyurethane polymer dissolved in an addition polymerizable combination of an acrylic or methacrylic monomer, a copolymerizable monomer containing at least one free carboxylic acid group, and a non-activated free radical addition polymerization catalyst system, and a second part comprising an activator for the free radical catalyst system. Exemplary of such a formulation is a first part made up of a polyester urethane, e.g., the condensation polymer of polyethylene adipate and toluene di-isocyanate containing no free isocyanate, dissolved in a mixture of acrylic acid and methyl methacrylate, each of the three components being present in equal amounts. About two weight percent benzoyl peroxide and about 0.1 weight percent hydroquinone are dissolved in the mix. The resulting formulation has a high degree of relative stability in the absence of an activator for the benzoyl peroxide. An appropriate second part, i.e., activator, comprises a tertiary amine, such as N,N-dimethyl aniline, diethyl aniline, N,N-dimethyl-p-toluidine. The second part may also contain an oxidizable heavy metal salt or other known accelerator for such free radical catalyst systems.
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Gallagher J. J.
Powell William A.
Pratt & Lambert, Inc.
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