Patent GB-548300-A (GB)
Title: Improvements in or relating to the production of water-resistant size coatings or films
IPC: D06M15/423
Filed: 1940-09-02
Abstract: 548,300. Cellulose derivatives; resinous condensation products ; water-proofing ; sizes ; films. TRIGGS, W. W. (Rohm & Haas Co.). Sept. 2, 1940, No. 13743. [A Specification was laid open to inspection under Sect. 91 of the Acts, April 22, 1941.] [Classes 2 (ii), 2 (iii) and 15 (ii)] [Also in Groups V and VIII] Water-soluble polyhydroxyl-containing organic compounds, suitable for use as sizing or film-forming materials, are heated with a condensation product of an amino-1, 3, 5- triazine, formaldehyde, and a strongly basic, non-aromatic amine having at least one hydrogen on the nitrogen so as to obtain a compound which is water-insoluble or is of reduced watersolubility. The process is applicable to the treatment of water-soluble cellulose ethers, such as water-soluble methyl or ethyl cellulose and hydroxyethyl cellulose, polyvinyl alcohol, starch, such as corn, rice, tapioca, sago, wheat, or potato starch, flour containing a high proportion of starch, modified starch, such as acid or enzyme-treated starch, oxidized starch, ethyl starch, and products of hydrolysis such as dextrines and sugars. The condensation products are aminomethylene amino-1, 3, 5- triazines. It is preferred to use those prepared from primary or secondary amines having substituents of less than nine carbon atoms. The reaction with the hydroxyl-containing compounds may be carried out in presence of alkaline or acidic catalysts, e.g. sodium carbonate, bicarbonate, or acetate, ammonium phosphates or chloride, or acetic acid. Textile fabrics, yarns, fibres, or paper, of cotton, linen, straw, jute, hemp, or synthetic fibres, or non- fibrous sheets, may be sized with a solution or dispersion of the water-soluble hydroxylcontaining compound and the triazine condensation product, which may be present in the form of an amine salt of an organic or inorganic acid, and the treated materials are then subjected to heating, e.g. to 80‹, 100‹ or 120‹C. Heating may be effected by passing the fabrics over hot rolls or through an oven. If desired the materials may first be sized with the hydroxyl-containing compound and then treated with the triazine condensation product. The hydroxyl-containing compound may be preliminarily toughened by treatment with the triazine compound prior to its application to the fabric or yarn. The process renders the sizes insoluble in water and improves their wash-fastness on the fabric or other material. The triazine compound mav be obtained from melamine, ammelide, ammeline, thio-ammeline, or derivatives thereof, e.g. diacyl ammelines, 2-chloro-4, 6-diamino-1, 3, 5-triazine, and 1- cyano-2-amino-4, 6-dimethyl-1, 3, 5-triazine. The process is applicable to the production of water-insoluble films from water-soluble materials. In an example, cotton fabric is coated with a paste of water-soluble ethyl cellulose, bis(dimethylamino methyl) thioammeline, and sodium carbonate. It is squeezed, dried, heated, washed, and ironed. A stiff finish, permanent to washing, is obtained. Cellulose acetate fabric is coated with a paste of potato starch, and bis-(dimethyl amino methyl)-diacetyl ammeline in the form of a salt of acetic acid, squeezed, heated, and washed. A stiff, water-resistant finish is obtained. Cotton sheeting is treated with tapioca starch and bis-morpholinomethyl ammelide hydrochloride. An aqueous solution of water-soluble ethyl cellulose and bis-(dimethylamino methyl) ammelide with sodium carbonate is spread on a glass plate to form a film which is dried and then heated. The film is then stripped from the plate. The film is insoluble in water. Specifications 539,768 and 545,215 are referred to.