Patent GB-543613-A (GB)
Title: Process of preparing nitrogenous cellulose derivatives
IPC: D06M15/423
Filed: 1940-09-02
Abstract: 543,613. Cellulose derivatives; treating textiles with liquids ; dyeing processes ; proofing permeable materials. ROHM & HAAS CO. Sept. 2, 1940, No. 13742. Convention date, Oct. 21, 1939. [Classes 2 (ii) and 15 (ii)] [Also in Group VIII] Cellulose derivatives containing nitrogen are obtained by treating a water-insoluble cellulosic material with a solution of a condensation product of an amino-1, 3, 5-triazine and at least molecular proportions of formaldehyde and a non-aromatic secondary amine, and subsequently heating the treated material. The process is applicable to the treatment of cellulose fibres to which it imparts improved handle, feel, appearance, and resistance to water, decreased tendency to shrink on wetting, and improved affinity for wool- and silkdyestuffs. The cellulose fibres may be cotton, linen, jute, hemp, mercerised cotton or linen, hydrated cellulose, regenerated cellulose, cellulose esters, cellulose ethers, or other cellulose derivatives containing hydroxyl groups. Fabrics fibres, yarns, battings, sheets, or strips may be treated. The amino-methylene-amino 1, 3, 5- triazines may be obtained from ammelide, ammeline, melamine, or derivatives thereof such as distearyl ammeline, 2- alkyl, 4-amino-6 hydroxyl-1, 3, 5-triazines, or similar compounds in which the triazine group carries alkyl, aryl, halogen, cyano, or other substituents e.g. 1- cyano-2-amino-4, 6-dimethyl-1, 3, 5-triazine or 2-chloro-4, 6-diamino-l, 3, 5-triazine. The non-aromatic amine may be dimethylamine, diethylamine, diallylamine, morpholine piperidine, or pyrrolidine. The amino methylene derivatives of amino-1, 3, 5-triazines may be dissolved or dispersed in a suitable liquid and applied in this form to the cellulose. The solubility of higbly substituted or long chain derivatives may be improved by the use of acids which form salts with the amino groups. The reaction is assisted by the presence of acids, acid salts, soda ash, borax, or sodium acetate. Local effects may be obtained on fabrics by printing with a solution or paste of the reagent. The impregnated - material is dried at room temperature or above and heated to a temperature of about 90-130‹C. to accelerate the chemical action on the cellulose. The triazine nucleus becomes chemically combined with the cellulose. The process may be-combined with a sizing or resin-finishing operation. In an example, bleached cotton fabric is coated with a solution of tris-(dimethylamino-methyl) melamine, water-soluble hydroxy ethyl cellulose acetic acid, and water. It is dried, heated, and washed, and then dyed with a boiling solution of Pontacyl Carmine 6B containing acetic acid. Other examples describe similar treatment of viscose rayon, cellulose acetate, and linen. Cotton fabric is dipped in a paste of bis- (dimethylamino-methyl) melamine hydrochloride, hydroxyethyl cellulose, and water, squeezed, heated, and washed. The stiffened fabric is dyed with fuchsin. Cotton fabric is treated with bis- (dimethylamino-methyl) diarachidyl ammeline<SP> </SP>and sodium carbonate. It is then baked at 140‹C. The fabric becomes resistant to wetting and has a soft and full feel. Cotton sheeting is treated under tension with an aqueous solution of tris- (dimethylaminomethyl) melamine hydrochloride and heated. It becomes resistant to shrinking. Specifications 539,768, 545,215 and 548,300 are referred to. The Specification as open to inspection under Sect. 91 comprises also the use of non-aromatic primary amines e.g. benzylamine, cyclohexylamine, and mono-butylamine in the formation of the condensation products. This subjectmatter does not appear in the Specification as accepted.