Ciba-geigy Corporation

Ciba-geigy Ag

Heinz Peter

Josef Pfeifer

Dieter Reinehr

Abul Iqbal

Rolf Steiger

Paul Lienhard

Mario Fryberg

Eduard Troxler

Rene Eric Muntwyler

Joachim Lorenz

Reinhardt Grade

Heinrich Schaller

A photographic silver dye bleach material which contains a compound of the formula ##STR1## in which R is a substituted alkyl, R.sub.1 is substituted or unsubstituted alkyl, p is 1 or 2, q is 0 or 1, p+q having to be 1 or 2, and n is 1 to 20, or a salt of this compound. The benzoquinones used deactivate bleach catalysts which diffuse beyond the silver image area produced by development of the exposed material. The silver dye bleach material containing these compounds is therefore distinguished by high contrast, high sharpness and good color reproduction.

Photographic material for the silver dye bleach process

The invention relates to the use of diamines of the formula I ##STR1## in which R and R.sup.1 are, for example, identical and are alkyl, as active substances for the control of harmful organisms in water and other materials, especially industrial materials. Inter alia, bacteria, fungi, yeasts and algae are controlled. The control is effected in standing and running waters. In preservatives and disinfectants, the diamines are used for natural and synthetic materials, especially industrial materials.

Methods and compositions for the control of harmful organisms containing

The partially crystalline polyamides according to the invention are obtained by reacting terephthalic acid, or an amide-forming derivative thereof, with a diamine of the formula ##STR1## in which R.sub.1 and R.sub.2 singly or together are organic radicals. The reaction mixture can also contain up to 30% by weight of other amide-forming substances (aminocarboxylic acids or lactams, or mixtures of dicarboxylic acids and diamines), provided the formation of the partial crystallinity of the resulting polyamides is retained. The polyamides are suitable for producing moulded products of the most varied types. They are particularly applicable for producing filaments and fibres.

1,10-Dialkyl-1,10-decamethylenediamines

A process for dyeing linear polyamides in the melt, in which process there are used salts from 1:2 chromium complexes of monoazo dyes and amines containing 1-18 C atoms.

Process for dyeing linear polyamides in the melt

Crystalline polyamides from branched chain diamine and terephthalic acid

The transparent polyamides of the invention have a reduced specific viscosity of at least 0.4 dl/g (0.5% solution of the polyamide in m-cresol at 25.degree. C.) and consist either of

Transparent polyamides from branched chain diamine

The invention provides transparent polyamides which have a specific viscosity of at least 0.4 dl/g (0.5% in m-cresol at 25.degree. C.). They consist of recurring structural units of the formula I ##STR1## and, as the case may be, of recurring structural units of the formula II ##STR2## wherein X.sub.1 represents ##STR3## X.sub.2 represents ##STR4## R.sub.1 and R.sub.8 represent in general alkyl radicals. R.sub.1 to R.sub.3 can also represent hydrogen, and R.sub.5 and R.sub.6 and R.sub.7 and R.sub.8, together with the carbon atom to which they are attached, also represent cycloalkyl. The polyamides are derived in their structure from 100 to 25 mol % of terephthalic acid and from isophthalic acid. The polyamides may contain only up to 75 mol % of structural elements of the formula II. They are suitable for the manufacture of transparent moulded articles.

Transparent polyamides from branched chain diamines

The polyamides according to the invention are mainly transparent (amorphous), but in some cases also partially crystalline. They have a reduced specific viscosity (0.5% in m-cresol at 25.degree. C.) of at least 0.3 dl/g, and consist of recurring structural elements of the formula I ##STR1## in which R.sub.1 and R.sub.2 are monovalent aliphatic or cycloaliphatic radicals, and Z is a bivalent aliphatic radical. The dicarboxylic acid structural radicals are derived in particular from adipic acid. The polyamides have high glass transition temperatures, and have a low water absorption and also good stability to hydrolysis. They can be processed into moulded articles (for example by the injection moulding process and extrusion process).

Aliphatic polyamide from disubstituted decane diamine

The invention relates to curable mixtures which contain 1,10-substituted 1,10-diaminodecanes, as the curing agents, new 1,10-substituted 1,10-diaminodecanes and a process for the manufacture of the latter. The new 1,10-diaminodecanes are manufactured by catalytic hydrogenation of corresponding 3,12-substituted 1,2-diazo-1,5,9-cyclododecatrienes in the presence of an inert organic solvent, while raising the temperature to at least 120.degree. C.

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Rheinfelden, Switzerland

Heinz Peter