Patent GB-631882-A (GB)
Title: Improvements in or relating to pigment-dyeing of fabrics
IPC: D06P1/44
Filed: 1946-10-16
Abstract: A composition for dyeing fabrics consists of a dispersion of a pigment in an aqueous solution of a water-soluble heat-precipitable alkyl cellulose, to which may be added a small amount of a water-soluble salt such as a sulphate, phosphate or tartrate to lower the gelation temperature of the alkyl cellulose. A water-soluble thermosetting condensation product, many of which are specified, is preferably also present in the dispersion.  The following examples are given: (1) cotton fabrics are padded with a composition containing copper phthalocyanine green dispersed in an aqueous solution of methyl cellulose, exposed to heat radiation and then dried; (2) cotton is padded with an aqueous composition containing methyl cellulose, diammonium hydrogen phosphate, water-soluble polyhydric alcohol-modified urea-formaldehyde condensation product and copper phthalocyanine blue; (3) cotton is padded with a composition containing methyl cellulose, sodium sulphate, diammonium hydrogen phosphate, water-soluble urea-formaldehyde condensation product and iron oxide red.  In other similar examples the following padding solutions are used: (4) methyl cellulose, water, diammonium hydrogen phosphate, water-soluble melamine-formaldehyde and carbon black; (5) methyl cellulose, water, disodium hydrogen phosphate, diammonium hydrogen phosphate, water-soluble melamine-urea-formaldehyde and Indanthrene Blue GCDS; (6) methyl cellulose, water, diammonium hydrogen phosphate, water-soluble polyhydric alcohol-modified mixed urea-formaldehyde and melamine-formaldehyde condensation product and Vat Yellow; (7) methyl cellulose, water, diammonium hydrogen phosphate, water-soluble polyhydric alcohol-modified urea-formaldehyde condensation product and Vat Yellow; (8) methyl cellulose, water, water-soluble polyhydric alcohol-modified urea-formaldehyde condensation product, diammonium hydrogen phosphate and copper phthalocyanine blue; (10) methyl cellulose, water, diammonium hydrogen phosphate, water-soluble polyhydric alcohol-modified melamine-formaldehyde condensation product, iron oxide yellow, iron oxide red and carbon black. Specifications 523,090, 561,641 and 561,642 are referred to.ALSO:Fabrics are dyed by applying a dispersion of a pigment in an aqueous solution of a water-soluble heat-precipitable alkyl cellulose, heating to effect precipitation of the alkyl cellulose before any appreciable vaporization of water takes place, and thereafter drying the fabric.  A small amount of a water-soluble salt such as a sulphate, phosphate or tartrate may be added to lower the gelation temperature of the alkyl cellulose.  A water-soluble thermosetting condensation product, many of which are specified, is preferably also present in the dispersion.  The fastness of the dyeing may be increased by overpadding the pigment-dyed fabric with a second aqueous resinous condensation product.  The following examples are given: (1) cotton fabrics are padded with a composition containing copper phthalocyanine green dispersed in an aqueous solution of methyl cellulose, exposed to heat radiation for 0.5 seconds and then dried on steam-heated cans; (2) cotton is padded with an aqueous composition containing methyl cellulose, diammonium hydrogen phosphate, water-soluble polyhydric alcohol-modified ureaformaldehyde condensation product and copper phthalocyanine blue, exposed to near-infra-red radiation and then dried by passing over steam-heated cans; (3) cotton is padded with a composition containing methyl cellulose, sodium sulphate, diammonium hydrogen phosphate, water-soluble ureaformaldehyde condensation product and iron oxide red, and passed directly over steam-heated cans.  In other similar examples the following padding solutions are used: (4) methyl cellulose, water, diammonium hydrogen phosphate, water-soluble melamineformaldehyde and carbon black; (5) methyl cellulose, water, disodium hydrogen phosphate, diammonium hydrogen phosphate, water-soluble melamine - urea - formaldehyde and Indanthrens Blue GCDS; (6) methyl cellulose, water, diammonium hydrogen phosphate, water-soluble polyhydric alcohol-modified mixed urea-formaldehyde and melamine-formaldehyde condensation product and Vat Yellow; (7) methyl cellulose, water, diammonium hydrogen phosphate, water - soluble polyhydric alcohol - modified urea - formaldehyde condensation product and Vat Yellow; (8) methyl cellulose, water, water-soluble polyhydric alcohol-modified urea-formaldehyde condensation product, diammonium hydrogen phosphate and copper phthalocyanine blue; (9) as in (2); and (10) methyl cellulose, water, diammonium hydrogen phosphate, water-soluble polyhydric alcohol-modified melamine-formaldehyde condensation product, iron oxide yellow, iron oxide red and carbon black.  In example (11) woollen goods are padded with a composition consisting of methyl cellulose, water, water-soluble polyhydric alcohol-modified melamineformaldehyde condensation product and copper phthalocyanine green, exposed to heat radiation, dried, and then overpadded with an aqueous solution of polyhydric alcohol-modified melamine-formaldehyde condensation product and diammonium hydrogen phosphate, dried, and cured at 350 DEG  F.  Examples (12) and (13) illustrate similar processes in which overpadding solutions are used.  Example (14) illustrates a process in which the fabric is padded, heated to gel the methyl cellulose, and again padded with the same composition to obtain a deeper colour. Specifications 523,090, 561,641 and 561,642 are referred to.