GB713002A - Process for the treatment of fabrics with resinous condensation products - Google Patents

Abstract

Textile fabrics composed wholly or partly of cellulose fibres are impregnated with an aqueous solution of melamine-formaldehyde or mixed melamine-formaldehyde urea-formaldehyde resinforming ingredients, including an acidic catalyst, dried and heated to insolubilise the resin in an atmosphere containing not less than 10 per cent of superheated steam. The impregnating solution may comprise crystalloidal intermediate condensation products of melamine and formaldehyde, or urea, melamine and formaldehyde. The molecular proportion of formaldehyde to melamine may exceed 3 : 1 and in the mixed resin there may be more than 3 molecular proportions of formaldehyde to each molecular proportion of melamine together with more than 1.6 molecular proportions for each molecular proportion of urea. The melamine may be replaced by an alkylated melamine. The superheated steam content of the heating atmosphere may be varied up to 100 per cent. The catalyst may be a mixture of calcium chloride and boric acid, ammonium thiocyanate, ammonium dihydrogen phosphate or aluminium acetate. An intermediate condensation product of the mixed resin may be prepared by mixing melamine-formaldehyde and urea-formaldehyde intermediate condensation products and catalysing the mixture or by mixing melamine and urea and partially condensing with formaldehyde before catalysing. The impregnating solution may also include lactices of natural or synthetic rubber, stearamidomethylpyridinium chloride, octadecyloxymethylpyridinium chloride, those polysiloxanes which impart water-repellent properties or wax emulsions. The fabrics treated may be of regenerated cellulose, cotton or a mixture of spun rayon and wool and may be mercerized before, after or both before and after the resin treatment. Specification 449,243, 695,703, 704,143 and 713,001 are referred to.