摘要:
N-hydroxypyrazoles of the general formula I ##STR1## where R.sup.1, R.sup.2 and R.sup.3 may be identical or different and are each hydrogen or halogen, are prepared by a process in which a pyrazole of the general formula II ##STR2## where R.sup.1, R.sup.2 and R.sup.3 have the meanings stated for formula I, is reacted with an aliphatic or aromatic peroxocarboxylic acid, preferably in the presence of from 0 to 15 moles of an alkali metal hydroxide, alkaline earth metal hydroxide, alkali meteal carbonate or alkaline earth metal carbonate in such a way that the reaction temperature is from -5.degree. C. to 60.degree.C.The reaction can be carried out in water as a solvent or in a 2-phase system consisting of water and an inert organic solvent which is poorly miscible with water, in the presence or absence of a suitable phase transfer catalyst. The peroxocarboxylic acid can be prepared in the reaction mixture before the reaction from H.sub.2 O.sub.2 and an acyl halide or a carboxylic anhydride or can be used in the form of an alkali metal salt or alkaline earth metal salt.
摘要:
A tetrachloroperylene-3,4,9,10-tetracarboxylic acid diimide pigment which contains not less than 85% by weight of the tetrachloro compound of the formula ##STR1## which is present to the extent of not less than 95% by weight in the .beta.-modification and which, in an X-ray spectrum, exhibits 2.sup..crclbar. CuK.sub..alpha. main lines at 9.0.degree., 13.3.degree., 15.0.degree., 16.8.degree., 19.1.degree., 21.5.degree., 24.2.degree., 25.4.degree., 26.5.degree., 27.0.degree. and 27.5.degree..In finishes, the pigment gives very brilliant colorations which are very highly lightfast and fast to weathering and which, upon weathering, neither bleach nor darken up.
摘要:
The compounds of the formula ##STR1## where Y is hydrogen, chlorine, bromine or nitro, Z is hydrogen, chlorine, bromine, a sulfonic ester group or unsubstituted or substituted sulfamyl, X is --O-- or ##STR2## R is alkylene which may or may not be interrupted by oxygen or ##STR3## m is 0 or 1, p is 1 or 2, R.sup.1 and R.sup.2 independently of one another are each hydrogen, unsubstituted or substituted alkyl, alkenyl, cycloalkyl, aralkyl, or aryl, or R.sup.1 and R.sup.2 together with the nitrogen form a heterocyclic structure, R.sup.3 is hydrogen or unsubstituted or substituted alkyl, R.sup.6 and R.sup.7 independently of one another are each hydrogen, unsubstituted or substituted alkyl, alkoxy or acylamino, K is a radical of a coupling component, A.crclbar. is an anion, R.sup.4 is unsubtituted or substituted alkyl and R.sup.5 is hydrogen or C.sub.1 -C.sub.4 -alkyl, and the radical ##STR4## may furthermore be an unsubstituted or substituted piperazine radical, are useful for dyeing acid-modified fibers, leather and in particular paper.
摘要:
N-.alpha.-alkoxyethylformamides of the formula ##STR1## where R is C.sub.1 -C.sub.18 -alkyl, are prepared by reacting a vinyl ether of the formulaCH.sub.2 .dbd.CH--OR (II),where R has the meaning stated in the formula I, with formamide in the presence of an acidic or basic catalyst at from -10.degree. to 150.degree. C.
摘要:
2-(1-Hydroxycarbalkoxymethyl)-acrylonitriles and 2-(1-hydroxycarbalkoxymethyl)-acrylates are prepared by a process in which an acrylonitrile or an acrylate is reacted with a glyoxylate in an aqueous medium at a pH greater than or equal to 6, in the presence of a tertiary amine as a catalyst.
摘要:
Cured aminoplast resins are recycled by a process in which said resins, which may contain fillers, are treated with an aqueous sulfite, hydrogen sulfite or disulfite solution and the resulting low molecular weight degradation products are used in chemical processes. The resulting low molecular weight degradation products of cured aminoplast resins are used for coating moldings, for tanning leather and skins and for the production of moldings which contain cured aminoplast resins or consist thereof.
摘要:
Stabilized aqueous C.sub.14 -C.sub.22 -alkyldiketene emulsions containing, as essential components:(a) from 10 to 60% w/w of at least one C.sub.14 -C.sub.22 -alkyldiketene,(b) from 1 to 10% w/w of at least one protective colloid and(c) from 0.1 to 20% w/w of at least one ester of formula I ##STR1## in which R.sup.1 and R.sup.2 each denote C.sub.14 -C.sub.22 -alkyl, R.sup.1 differing in this case from R.sup.2 by at least 4 carbon atoms in the alkyl chain, and/or the same or different C.sub.14 -C.sub.22 -alkenyl groups, or at least one ester of the formula R.sup.3 --O--CO--O--R.sup.4 (II), in which R.sup.3 and R.sup.4 are alkyl or alkenyl radicals of from 2 to 22 carbon atoms or at least one urethane of formula III ##STR2## in which R.sup.5, R.sup.6 and R.sup.7 are the same or different alkyl or alkenyl radicals of from 2 to 22 carbon atoms and one of the substituents R.sup.5, R.sup.6 and R.sup.7 contains at least 12 carbon atoms,and showing a ratio of emulsified components (a):(c) from 200:1 to 1:1 and the use of compounds of formulae I to III as stabilizers for the preparation of alkyldiketene emulsions containing at least 10% w/w and preferably from 16 to 40% w/w of emulsified alkyldiketene.
摘要:
Cyclic N,N'-dimethylureas I ##STR1## where A is a 1,2- or 1,3-alkylene group of 2 to 10 carbon atoms, are prepared by reacting the corresponding non-methylated cyclic urea with formaldehyde and excess formic acid and then removing the formic acid still present in the reaction mixture, by a process in which the formic acid is subjected to a thermal decomposition reaction by means of a catalyst system consisting of a tertiary amine and a copper salt.
摘要:
The invention relates to basic chromium aluminum sulfates which are soluble in cold water and are of the general formulaCr.sub.x Al.sub.2-x (OH).sub.2 y. (SO.sub.4).sub.3-y.n H.sub.2 Owhere x is from 0.1 to 1.9, y is from 0.01 to 2 and n is from 4 to 24, and a process for the preparation thereof. The process comprises reacting chromium (III)--containing waste sulfuric acid having a water content of 20-50% by weight with aluminum oxide and/or aluminum oxide hydroxide and/or aluminum hydroxide at a temperature of 100.degree. to 200.degree. C. The molten product is converted to droplet form and allowed to solidify in free fall.
摘要翻译:本发明涉及可溶于冷水并具有通式Cr x Al 2-x(OH)2 y)的碱性铬酸铝硫酸盐。 (SO 4)3-y.nH 2 O,其中x为0.1至1.9,y为0.01至2,n为4至24,以及其制备方法。 该方法包括在100至200℃的温度下将含水量为20-50重量%的含铬(III)的废硫酸与氧化铝和/或氧化铝氢氧化物和/或氢氧化铝反应。 熔融产物转化为液滴形式,并在自由落体下固化。
摘要:
A transparent pigmentary form of 4,4',7,7'-tetrachlorothioindigo is prepared by oxidizing the leuco compound of tetrachlorothioindigo in aqueous alkaline suspension, in the presence of a dithionite, at from 20.degree. to 100.degree. C., with simultaneous exposure to shearing forces. Preferably, the oxidation is carried out in the presence of a surfactant.The pigment obtained gives brilliant, transparent full-shade colorations, while white reductions have a deep pure reddish hue.