Aqueous acrylate contact adhesive dispersions

Abstract

An adhesive composition which comprises for each 100 parts, by weight, of an aqueous dispersion having a pH of from about 3 to 10 of the following ingredients dispersed in 25 to 75 parts of water. A. from 25 to 70 parts by weight of a water insoluble polymer containing the following interpolymerized monoethylenically unsaturated monomers. A. at least 50% by weight, based on the polymer, of acrylate monomers; B. from about 0.1 to 10% by weight based on the polymer, of N-methylolacrylamide, and C. from about 0.1 to 25% by weight, based upon the polymer, of a monoethylenically unsaturated monomer containing carboxylic acid groups D. from about 2 to 40% based upon the polymer of an acrylonitrile E. from 0 to 40% by weight based on the polymers of an addition polymerizable vinyl monomer other than those defined above F. from 0 to 1% by weight based on the polymer of a cross-linking agent B. a small but effective amount to thicken the acrylate composition up to 3 parts by weight of the composition of an alkali metal or ammonium salt of a polyacrylic acid C. from a small but effective amount to impart freeze-thaw stability up to 3 parts of a surface active agent D. from a small but effective amount to depress the freezing point of the dispersion up to 3 parts of a freezing point depressor E. from a small but effective amount to render the dried adhesive tacky up to 10 parts of a tackifying agent. Compositions within the scope of the present invention are useful as contact adhesives. These adhesives have the same utility as known contact cements that effect strong instant bonds on contact with a variety of substrates including plywood, hardboard, particleboard, wood, leather, floor coverings, Styrofoam, metal sheeting and plastic laminates such as Formica. The cured adhesive films formed are resistant to oil, gasoline, water, heat and discoloration or aging.

Dependencies are inferred from the claim text.