Patent GB-385391-A (GB)
Title: Improvements in or relating to the production of effects on sheet materials
IPC: B05D5/06
Filed: 1931-10-30
Abstract: Finely powdered pigment is fixed on cellulose or cellulose derivative films or sheets the substance of which has been rendered sticky.  The pigment is fixed solely by the adhesive property of the sheet material.  The sheet material may comprise a cellulose ester or ether such as cellulose formate, acetate, propionate or butyrate, or benzyl cellulose, ethyl or methyl cellulose, or nitrocellulose, or it may consist of regenerated cellulose such as "Cellophane."  The pigment may be ultramarine, vermilion, barium sulphate, titanium oxide, zinc oxide, condensation products of urea or thiourea with benzidine, di-a -naphthyl-urea or thiourea, diacetyl-benzidine, or dibenzoyl-benzidine.  The use of powdered metals is excluded.  The pigment may be applied while the material is still in a sticky condition owing to its content of residual solvent used in its manufacture, or solvents or softening agents may be applied to the finished material by spraying, brushing, immersion, or treatment with solvent vapour.  Solvent or softening agents which may be used for cellulose acetate films are acetone, diacetone alcohol, ethyl alcohol, phenols, cresols, or formic, acetic, or butyric acid.  In the case of sheets of regenerated cellulose the softening agent may be Schweitzer's reagent.  The pigment may be fixed on the softened sheet material by passing the sheets or films through a zone or chamber in which the finely powdered pigment is blown about or allowed to fall across the path of the sheets, or a gaseous stream containing the suspended pigment may be sprayed on to the sheets. Local effects may be obtained by directing the pigment through stencils or by printing.  If desired the treated sheets may be coated with a layer of varnish, and in the case of cellulose ester or ether sheets, the protective layer may comprise a cellulose derivative of different solubility characteristics from that of the base. Specification 340,636 is referred to.  The Specification as open to inspection under Sect. 91 describes also the use of metal powders such as bronze and aluminium, phosphorescent or luminous powders such as phosphorescent zinc, calcium, or barium sulphide, substances producing a nacreous effect such as fish scale or mercurous chloride. Application of the softening agent simultaneously with the pigment is also described.  This subject-matter does not appear in the Specification as accepted.ALSO:The Specification as open to inspection under Sect. 91 describes a process in which finely powdered metal such as bronze and aluminium is fixed on cellulose or cellulose derivative films or sheets the substance of which has been rendered sticky.  The sheet material may comprise a cellulose ester or ether such as cellulose formate, acetate, propionate or butyrate, or benzyl cellulose, ethyl or methyl cellulose, or nitrocellulose, or it may consist of regenerated cellulose such as "Cellophane."  The metal powder may be applied while the material is still in a sticky condition owing to its content of residual solvent used in its manufacture, or solvents or softening agents may be applied to the finished material by spraying, brushing, immersion, or treatment with solvent vapour.  Solvent or softening agents which may be used for cellulose acetate films are acetone, diacetone alcohol, ethyl alcohol, phenols, cresols, formic, acetic, or butyric acid.  In the case of sheets of regenerated cellulose the softening agent may be Schweitzer's reagent.  The metal may be fixed on the softened sheet material by passing the sheets or films through a zone or chamber in which the finely powdered metal is blown about or allowed to fall across the path of the sheets, or a gaseous stream containing the suspended metal may be sprayed on to the sheets.  Local effects may be obtained by directing the metal through stencils or by printing. If desired the treated sheets may be coated with a layer of varnish, and in the case of cellulose ester or ether sheets, the protective layer may comprise a cellulose derivative of different solubility characteristics from that of the base.  This subject-matter does not appear in the Specification as accepted.