Patent GB-346264-A (GB)
Title: Improvements in processes for the production of adhesives and the adhesives produced thereby
IPC: C09J7/10
Filed: 1929-10-25
Abstract: A dry adhesive, in the form of powder, flakes, sheet or strips, adapted to be applied as such without moistening to the surfaces to be united, is made by mixing with an adhesive such as leather or other glue, casein, blood albumen or gluten-containing albuminous substances, a hygroscopic substance such as glycerine, calcium or magnesium chloride, or a hygroscopic sugar, and drying the mixture on plates, bands, or rollers.  The adhesive may be hydrolyzed, prior to the mixing, by means of alkalies, enzymes, enzyme-acid, or enzyme-base mixtures in known manner, the acids or bases then being neutralized and the enzymes rendered inactive by means of phenols. Colloidal rubber solutions such as latex, and fillers such as levigated clay, talcum or bole may be added before drying on vacuum rollers or gelatinizing machines.  Films of varying thickness such as 0,12 or 0,2 mm. are obtained by varying the strength of the mixture. Latex cannot be added if a hygroscopic salt is used.  The dry adhesive may be used in all branches of the woodwork or like industries, especially in plywood manufacture, and for application to metal surfaces.  Temperatures and pressures corresponding to those in common use cause adherence.  The Specification as open to inspection under Sect. 91 (3) (a) states that the hydrolysis may be effected by addition of "easily fusible salts of an organic or inorganic nature such as alkali and ammonia salts of acetic, lactic, phosphoric, or sulphuric acid," with, if desired, very dilute acids which are subsequently neutralized.  This subject-matter does not appear in the Specification as accepted.ALSO:A dry adhesive, in the form of powder, flakes, sheet or strips, adapted to be applied as such without moistening to the surfaces to be united, is made by mixing with an adhesive such as leather or other glue, casein, blood albumen or gluten-containing albuminous substances, a hygroscopic substance such as glycerine, calcium or magnesium chloride, or a hygroscopic sugar, and drying the mixture on plates, bands, or rollers.  The adhesive may be hydrolysed, prior to the mixing, by means of alkalies, enzymes, enzyme-acid, or enzyme-base mixtures in known manner, the acids or bases then being neutralized and the enzymes rendered inactive by means of phenols.  Colloidal rubber solutions such as latex, and fillers such as levigated clay, talcum or bole may be added before drying on vacuum rollers or gelatinizing machines. Films of varying thickness such as 0,12 or 0,2 mm. are obtained by varying the strength of the mixture.  Latex cannot be added if a hydroscopic salt is used.  The dry adhesive may be used in all branches of the woodwork or like industries, especially in plywood manufacture, and for application to metal surfaces.  Temperatures and pressures corresponding to those in common use cause adherence. p The Specification as open to inspection under Sect. 91 (3) (a) states that the hydrolysis may be effected by addition of "easily fusible salts of an organic or inorganic nature such as alkali and ammonia, salts of acetic, lactic, phosphoric, or sulphuric acid," with, if desired, very dilute acids which are subsequently neutralized.  This subject-matter does not appear in the Specification as accepted.