Patent GB-592484-A (GB)
Title: Manufacture and use of printing and like compositions
IPC: D06P5/00
Filed: 1941-09-20
Abstract: Preparations suitable for use in planographic printing, being hard at room temperature, thermoplastic and with a long softening range, are obtained by incorporating a developable colour composition with a carbohydrate gum.  Specified developable colour compositions are mixtures comprising (a) a vat dyestuff, a reducing agent and an alkali, or (b) a soluble ester of a leuco vat dyestuff, or (c) a stabilized diazo component and a coupling component.  Specified gums are various dextrins, including yellow corn dextrin and British gum. The preparation may also contain a soap, a wax or a wetting agent, such as an ester of sulphosuccinic acid.  In examples: (1), (2) and (3), a mixture of British gum, tapioca flour, corn starch and water is evaporated, with constant stirring, to a viscous paste into which are mixed successively sodium carbonate, sodium formaldehydesulphoxylate, a colloidized powder of (1) 6 : 61-dichloro - 4 : 41 - dimethyl - bis - thionaphthene - indigo; (2) Vat yellow GC; (3) Indanthrene blue GCD, and an aqueous solution of ferric chloride, the mixture being then dried in vacuo at 65 DEG  C. and ground; the product is then mixed with distilled water and evaporated to suitable consistency for use in forming a block for planographic printing of a wetted-out rayon fabric delustred with titanium dioxide, the print being dried, aged, oxidized, soaped and dried; (4) a yellow corn dextrin slurry is evaporated with stirring to a smooth uniform paste into which are mixed successively olive oil soap, sodium carbonate, sodium formaldesulphoxylate and Scarlet 2CHN double powder or a mixture of hydron pink and hydron orange, the temperature being maintained at 70-75 DEG  C. until the mixture is of a consistency suitable for moulding into a block for use in planographic printing of pigmented rayon or cotton; (5) a thickener comprising British gum, tapioca flour and corn starch is milled at 60-65 DEG  C. with sodium carbonate, sodium formaldehydesulphoxylate and Jade green NP double paste until of suitable consistency for planographic printing; (6) a thickener comprising dextrin, sodium carbonate, potassium carbonate, sodium formaldehydesulphoxylate and glycerol is milled with 5 : 51-dichloro-7 : 71-dimethyl - 2 : 21 - bis - thionaphthene - indigo and more sodium formaldehydesulphoxylate and the mixture is dried until of suitable consistency for planographic printing; (7) a yellow dextrin slurry is cooked to a smooth paste to which are added Jade green NP paste, a hot aqueous paste of olive oil soap, glyceryl monostearate and the sodium salt of the isobutyl ester of sulphosuccinic acid, sodium carbonate in aqueous solution and sodium formaldehydesulphoxylate and the mixture is dried in vacuo at 70-75 DEG  C. to obtain a product suitable for use in planographic printing of cotton, rayon, saponified cellulose acetate or silk; (8) a yellow dextrin slurry is cooked to a smooth paste to which are added chlorinated dibenzanthrone, olive oil soap, glyceryl monostearate and water, sodium carbonate in aqueous solution and sodium formaldehydesulphoxylate and the mixture is dried in vacuo at 75-80 DEG  C. until of suitable consistency for planographic printing; (9) a yellow dextrin slurry is mixed with 6 : 61-dichloro - 4 : 41 - dimethyl - 2 : 21 - bis - thionaph thene-indigo dispersed presscake and cooked to a smooth paste to which are added olive oil soap, glyceryl monostearate, sodium carbonate and sodium formaldehydesulphoxylate and the p  mixture is dried until suitable for use in planographic printing; (10) a slurry of British gum, tapioca flour and corn starch is partially evaporated and into it are successively mixed potassium carbonate, sodium formaldehydesulphoxylate, a mixture of Hydron pink and Hydron orange, anthraquinone and glycerol and the whole is dried in vacuo at 65 DEG C. and made into a stiff dough with distilled water; (11) the product of (9) is mixed with a bentonite gel containing sodium carbonate and evaporated to a consistency suitable for planographic printing on rayon and cotton; (12) to a smooth aqueous paste of yellow dextrin, neutralized with potassium carbonate, are successively added an ammoniacal solution of sodium bichromate, the sulphuric acid ester of leucodimethoxydibenzanthrone pasted with ethylene glycol monoethyl ether, and octyl alcohol, and the mixture is dried, printed planographically on a cotton or rayon fabric, the print being aged, oxidized, soaped and dried; (13) to an aqueous paste of yellow dextrin, made just alkaline are added an aqueous paste containing glyceryl monostearate and the sodium salt of the isobutyl ester of sulphosuccinic acid, diazotized 4-chloro-2-aminotoluene stabilized with biguanide, the o-toluidide of 2 : 3-hydroxynaphthoic acid, butyl alcohol and sodium hydroxide and the mixture is dried in vacuo until of a consistency suitable for planographic printing; (14) to a thickening containing dextrin and cerelose are added Scarlet 2GN powder or a mixture of Hydron pink and Hydron orange, olive oil soap, glyceryl monostearate, water, sodium carbonate and sodium formaldehydesulphoxylate and the mixture is dried until of a consistency suitable for planographic printing.  Specification 474,827 is referred to.