Patent GB-626581-A (GB)
Title: Decorating textiles
IPC: D06P1/44
Filed: 1947-07-02
Abstract: N-methoxymethyl polyhexamethylene adipamide is made by adding paraformaldehyde dissolved in methanol containing a small quantity of sodium hydroxide to a solution of polyhexamethylene adipamide in formic acid, heating to 60 DEG  C. for 30 minutes, pouring into aqueous acetone and precipitating the product by adding ammonia. N-methoxymethyl polyhexamethylene sebacamide is made by heating polyhexamethylene sebacamide with paraformaldehyde and methanol in presence of phosphoric acid.  The N-butoxymethyl derivative of a 30 : 70 hexamethylene adipamide : hexamethylene sebacamide interpolymer is prepared by dissolving the interpolymer in formic acid and heating with paraformaldehyde and benzyl alcohol. N-(carboxymethoxymethyl)-polyhexamethylene adipamide is prepared from polyhexamethylene adipamide, formic acid, paraformaldehyde and hydroxyacetic acid, and converted to its potassium salt by treatment with aqueous potassium hydroxide.  Similarly, N - allyloxymethyl polyhexamethylene adipamide is made from polyhexamethylene adipamide, paraformaldehyde and allyl alcohol. Other derivatives specified are the N-benzyloxymethyl, the N-isobutoxymethyl, and the N-allyloxymethyl derivatives.  In general the linear polyamide has the side chain -CH2-OR attached to some of the amide N-atoms, in which OR is the radical of a saturated or unsaturated aliphatic alcohol, aromatic alcohol or carboxy substituted aliphatic or aromatic alcohol.  The polymerizable mixture may, if desired, contain a proportion of secondary amines so as to produce some fully substituted amide linkages.  In admixture with a pigment and a volatile liquid such as alcohol, water, butanol or xylene, the products may be used for colouring textiles.  Specifications 461,236 and 461,237 are referred to.ALSO:Textile fibres are coloured by applying a composition comprising a volatile liquid vehicle, a pigment and a bonding agent which is a film-forming linear polyamide some of whose amide N-atoms bear a side chain -CH2-OR (wherein OR is the radical of a saturated or unsaturated aliphatic alcohol, an aromatic alcohol or a carboxy-substituted aliphatic or aromatic alcohol), and then heating the fibres to evaporate the volatile liquid and insolubilize the bonding agent.  The composition may be applied by padding or printing.  The polyamide may be dissolved in alcohol, water, butanol or xylene and the pigment dispersed in this solution and, where a water-insoluble solvent is selected, water is incorporated to form a water-in-oil emulsion.  In examples: (1) cotton fabric is passed through a dispersion of copper phthalocyanine in a solution of N-methoxy-methyl polyhexamethylene adipamide in a methanol-water mixture and then heated; (2) cotton is dyed with a dispersion of chlorinated copper phthalocyanine in a methanol-water solution of N-methoxymethyl polyhexamethylene sebacamide, and then exposed to acetic acid vapours and steam; (3) a printing paste is prepared by adding an aqueous emulsion (made from a solution of the N-butoxymethyl derivative of a 30 : 70 hexamethylene adipamide : hexamethylene - sebacamide interpolymer in n-butyl alcohol-xylol 25 : 75) to a pigment paste consisting of 3,31-dichlorobenzidine \sQ phenyl methyl pyrazolone, water, n-butyl alcohol and xylol; (4) cotton is padded with a mixture of the potassium salt of N-(carboxymethoxymethyl)-polyhexamethylene adipamide and the pigment paste of (2) and then heated; (5) cotton is printed with a paste made by stirring N-methoxymethyl polyhexamethylene, sebacamide, alcohol, water, hydrolysed interpolymer of vinyl acetate and allylidene diacetate and copper phthalocyanine, and the resin cured as in (2); and (6) cotton is padded with a dispersion containing an aqueous-alcoholic solution of N-allyloxymethyl polyhexamethylene adipamide and copper phthalocyanine, and cured as in (1).  Other derivatives which may be employed are the N-benzyloxymethyl, the N-isobutoxymethyl and the N-allyloxymethyl derivatives.  The degree of N-substitution preferably is between 10 and 100 per cent. Specifications 461,236 and 461,237 are referred to.