Abstract: Flame retardant, and under some conditions self-extinguishing synthetic polymers are made by the addition thereto of a complex salt of an alkali aluminum acid of the formula:Me.sub.k.sup.I Me.sub.m.sup.II [Z(C.sub.2 O.sub.4)n]wherein Me represents Li, Na, K, Rb, Cs or NH.sub.4, Me.sup.II represents one of the aforementioned cations or Ba; Z represents one of the central atoms Mg, Ba, Zr, Fe, Co, Cu, Zn, Al, Sn, Cr and Sb and k.apprxeq.0,1,2,3, or 4, m.apprxeq.0 or 1 and n.apprxeq.2,3 or 4, where the value of k, n and m may be other than integers provided that k and m are not, simultaneously, zero.

Abstract: The invention relates to valuable new reactive dyestuffs of the general formula ##SPC1##In which A stands for hydrogen, a methyl, phenyl, lower carbalkoxy, optionally substituted carboxamide or a carboxy group; B denotes a carboxy, lower carbalkoxy, optionally substituted carboxamide or nitrile group; Z means a hydroxy or amino group; R.sub.1 and R.sub.2 stand for identical or different radicals such as hydrogen or methyl; D denotes the radical of a diazo component containing a reactive group; and n means the number 0 or 1; which are suitable for the dyeing and printing of materials containing hydroxyl or amide groups and for dyeing natural or regenerated cellulose fast to washing.

Abstract: A synthetic leather consisting essentially of three adherent microporous polyurethane layers, including a first base layer of a polyurethane impregnated fibrous fleece or web, a second or intermediate polyurethane layer containing 3-30% by weight of very finely divided insoluble solid particles with an individual volume is less than 2.times.10.sup..sup.-2 mm..sup.3 and with a maximum length generally below about 0.3 mm., preferably less than 0.1 mm., and a third or cover polyurethane layer which can be finished in a conventional manner. The product is especially distinguished by a smooth and uniform surface resistant to the "orange peel" effect. The method is distinguished by the application of the intermediate layer before the base layer is completely coagulated or solidified in the formation of the microporous structure.