Patent GB-1479060-A (GB)
Title: Method of adhering together sheets of sheet material
IPC: C09J189/00
Filed: 1974-10-31
Abstract: 1479060 Binding manifolding sheets FUJI PHOTO FILM CO Ltd 31 Oct 1974 [31 Oct 1973 (2)] 47275/74 Heading B6A [Also in Division C3] A method of adhering together sheets of sheet material, in particular pressure-sensitive copying papers, comprises applying to at least one of the cut edges of a stack of such sheets an adhesive composition comprising 5-40% wt. based on the weight of the composition of a condensate of formaldehyde with a naphthalene sulphonate in the free sulphonic acid form or as its salt, the naphthalene nucleus being optionally alkyl substituted, and preferably selectively separating the sheets of the stack into multi-ply sets after the adhesive has dried. The condensate preferably has the general formula wherein R represents an alkyl group, X represents hydrogen, an alkali metal or an ammonium group; n is an integer and x is 0-5. The adhesive may include an aqueous emulsion of a water-insoluble film-forming polymer. Suitable emulsions include a latex of a styrenebutadiene rubber, a butadiene - acrylonitrile rubber, a chloroprene rubber, a vinyl acetate polymer, an acrylic polymer or of a vinyl chloride polymer, or an emulsion of polyisoprene, polybutadiene or butyl rubber. The adhesive may also include a water-soluble binder, e.g. a natural polymer such as a protein, e.g. gelatin, albumen or casein; shellac; a cellulose, e.g. carboxymethyl- or hydroxyethyl-cellulose, another polysaccharide, e.g. agar-agar, gum arabic, sodium alginate, starch or carboxymethyl starch; a synthetic polymer, e.g. polyvinyl alcohol, polyvinyl pyrrolidone or an acrylic polymer. The adhesive may also contain a surface active agent, e.g. trimethyl octadecyl ammonium chloride, sodium oleate, a polyoxyethylene alkylarylether or sodium lignosulphonate. The pressure sensitive copying papers which can be adhered may be made up in sets composed of (i) a sheet having coated thereon a layer containing a micro-encapsulated colour former (Paper A); (ii) optionally one or more sheets having on one face a layer containing microencapsulated colour former and on the other face a layer of colour developer (Paper B); and (iii) a sheet having coated thereon a layer of colour developer. Suitable sheet materials include paper, plastics films, resin-coated paper and synthetic paper. In the examples a stack of pressure sensitive copying papers superposed in sets in the order A-B-B-C are adhered together by applying to a cut edge of the stack an adhesive composition comprising: (1) an aqueous solution of a sodium naphthalene-sulphonate-formaldehyde condensate alone or together with either (i) shellac and monoethanolamine; or (ii) the sodium salt of carboxymethyl cellulose; or (iii) a carboxy-modified styrene-butadiene copolymer latex; or (iv) a latex of a carboxy-modified copolymer of methyl methacrylate and ethyl acrylate, or (v) a copolymer of styrene with an acrylic ester; or (2) a potassium-naphthalenesulphonate formaldehyde condensate, a cationic surface active agent, water and a latex of a carboxy-modified copolymer of methyl methacrylate and ethyl acrylate; or (3) water, polyvinyl alcohol and a sodium methylnaphthalene sulphonate-formaldehyde condensate.