Abstract: A method of binding book blocks to form books is disclosed. The method involves applying an aqueous composition to the spine area of a book block and removing the volatile components of the composition. The composition comprises (1) an aqueous vehicle, a film-forming polymeric resin, and a polyurethane resin or (2) an aqueous polyurethane dispersion or emulsion. The composition may also include an alkaline component. In another embodiment, the composition comprises a mixture of an aqueous, film-forming polymeric latex, an alkaline component to adjust the pH the latex to that of an aqueous polyurethane dispersion, and the aqueous polyurethane dispersion.

Abstract: The disclosed adhesive system comprises a curable liquid epoxide and a bisamino piperazine-containing thermoplastic polyamide hardener or co-curative. This adhesive system forms high strength metal-to-metal bonds with unusually high T-peel strength, high tensile shear strength, excellent low temperature properties, and good impact resistance while possessing the fast assembly speed characteristics of a hot melt. Both two-part and stable one-part curable systems can be formulated from (a) suitable epoxy resins and (b) the bisamino piperazine-containing thermoplastic polyamide.The particularly preferred polyamide comprises the amidification product, at temperatures of from 180.degree. C. to 300.degree. C.