| 摘要 |
1,239,818. Brightening textile materials. J. R. GEIGY A.G. 2 Aug., 1968 [3 Aug., 1967], No. 37026/68. Heading D1P. [Also in Divisions C2 and C3] Optical brighteners for fibrous cellulosic substrates comprise triazinyl compounds of the formula wherein A represents the residue of a non- aromatic N-containing heterocyclic ring which may also contain oxygen as a hetero atom and may be substituted by C 1-3 alkyl groups, R represents hydrogen, halogen or a C 1-6 alkyl group, and M<SP>+</SP> represents a cation derived from hydrogen, alkali metals, alkaline earth metals, optionally substituted ammonia or aluminium. The triazinyl compounds are particularly effective for brightening paper, but other specified substrates are cotton, staple fibre and rayon. Paper may be brightened by including the triazinyl compound in the pulp or, preferably, by surface treatment of the paper using, e.g., (a) an aqueous solution of the compound, (b) sizing compositions which are aqueous binder preparations, e.g. based on starch, or aqueous acrylic polymer compositions, or (c) coating compositions comprising a sizing composition and a white pigment. Textile substrates may be brightened by applying the triazinyl compounds from aqueous baths or by combining brightening with another treatment, e.g. washing, rinsing with softeners or imparting crease-resistant finishes with resin precondensates. Example 7 describes the preparation of paper from a brightened pulp. Example 8 relates to the brightening of cotton fabric. In Examples 9 and 10 brightening is combined with the application of a crease-resistant finish to cotton. |
