| 摘要 |
<p>807,904. Waterproofing; paper &c. BOEHME FETTCHEMIE G.m.b.H. Dec. 6, 1956 [Dec. 7, 1955], No. 37261/56. Classes 96 and 140. Materials are water-proofed by treating them with solutions of compounds obtained by reacting basic polyvalent metal salts with acid phosphoric acid esters of hydroxyl compounds containing at least eight carbon atoms per molecule, in the presence of alcohols having not more than four carbon atoms per molecule The compounds are described in Specification 805,150, [Group IV (b)]. Aluminium, tin, chromium, zirconimm and titanium salts may be used. The materials treated may be e.g. of linen, jute, cotton, rayon, silk, wool, polyamide, polyester, polyacrylonitrile, or alginate fibres in the form of threads, flakes, strands, woven or knitted fabrics or felts Paper such as wallpaper and packing paper, cardboard, paper pulp when still in the hollander, wood, fibre board, cellolose skins, feathers, synthetic materials and porous ceramic materials and metal surfaces may be treated. The impregnant is applied by brushing, immersion, spraying, sprinkling or applying with a roller. As the acid phosphoric acid esters may be used acid mono- or di-esters of orthophosphoric acid, eg mono- or di-octyl, mono- or di-dodecyl, mono- or di-oleyl phosphoric acid esters or esters of other aliphatic cycloaliphatic fatty aromatic or cycloaliphatic aromatic hydroxyl compounds The alcohols may be methanol or ethanol and hydrolysable salts of eg. zirconium may also be included in the compositions</p> |
