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:
Condensation polymers of sulfonated phenols, urea, other organic nitrogen-bases and formaldehyde, obtainable by(A) sulfonation of phenols with from 1.0 to 1.5 moles of sulfuric acid per mole of phenol and(B) condensation of these sulfonation products with(a) from 0.5 to 1.8 moles of urea per mole of phenol,(b) from 0.001 to 0.5 moles of at least one other organic nitrogen-base per mole of phenol, and(c) from 1.0 to 3.0 moles of formaldehyde per mole of phenol.The condensation polymers are suitable for use as tanning agents in the leather and skin-producing industry and as spraying aids for redispersible polymer powders.
摘要:
A condensation polymer, obtainable by condensation of a mixture containing, as chief components,(A) from 90 to 99.9% molar of a mixture substantially consisting of(a) from 30 to 99% molar of melamine and(b) from 1 to 70% molar of a substituted melamine of the general formula I ##STR1## in which X, X', and X" are selected from the group consisting of --NH.sub.2, --NHR, and --NRR', and only one or two of X, X', and X" denote(s) --NH.sub.2, and R and R' are selected from the group consisting of hydroxy-C.sub.2 -C.sub.10 -alkyl, hydroxy-C.sub.2 -C.sub.4 -alkyl-(oxa-C.sub.2 -C.sub.4 -alkyl).sub.n, where n is an integer from 1 to 5, and amino-C.sub.2 -C.sub.12 -alkyl, or mixtures of melamines I, and(B) from 0.1 to 10% molar, based on (A) and (B), of unsubstituted phenols or phenols substituted by radicals selected from the group consisting of C.sub.1 -C.sub.9 -alkyl and hydroxy, or of C.sub.1 -C.sub.4 -alkanes substituted by two or three phenol groups, di(hydroxyphenyl)sulfones, or mixtures of said phenols,with formaldehyde or formaldehyde-liberating compounds, the molar ratio of melamine to formaldehyde ranging from 1:1.15 to 1:4.5.
摘要:
Moldings, in particular foams and fibers, based on melamine/formaldehyde condensation products, in which from 0.1 to 70 mol % of the melamine have been replaced by melamine substituted by from 1 to 3 hydroxyoxaalkyl groups of the formula--(CH.sub.2 --CH.sub.2 --O).sub.n --CH.sub.2 --CH.sub.2 --OHn=1-5)have increased elasticity.
摘要:
A process is described for the preparation of an N-alkyl- or N,N-dialkyl-1,2-diaminoethane of the general formula I ##STR1## where R.sup.1 is hydrogen or methyl, R.sup.2 is C.sub.1 - to C.sub.5 -alkyl, and R.sup.3 is hydrogen or C.sub.1 - to C.sub.5 -alkyl, with the proviso that the total number of carbon atoms in R.sup.2 and R.sup.3 is an integer from 1 to 6, by reacting an imine of the general formula II ##STR2## with an amine of the general formula III ##STR3## where R.sup.1, R.sup.2 and R.sup.3 are as defined above, which comprises carrying out the reaction in the presence of carbon dioxide at from 10.degree. to 150.degree. C. and at from 0.5 to 50 bar.
摘要:
Polyamide substrates are dyed from aqueous baths with suitable dyes and with copper complexes of organic N-nitrosohydroxylamines as light stabilizers for the dyed polyamide.
摘要:
Hydroxyoxaalkylmelamines of the general formula I ##STR1## where the radicals R may be identical or different and are each hydrogen or a radical of the general formula IIH--(--O--CHR'--CHR'--)--.sub.n (II)where the radicals R' may be indentical or different and are each hydrogen or C.sub.1 -C.sub.4 -alkyl and n is 2 or 3, and mixtures of these, are useful intemediates for the preparation of urethanes and for modifying aminoplast resins.
摘要:
Ditriazolylvinyl phenyl ketones of the formula I ##STR1## where R is halogen, alkyl of 1 to 6 carbon atoms, alkoxy of 1 to 6 carbon atoms, trifluoromethyl, cyano, nitro, phenyl or phenoxy, and n is an integer from 0 to 5, and the two triazole rings can, as desired, be bonded in the 1-position or 4-position to the vinyl group, their preparation and their use as nitrification inhibitors.
摘要:
Useful novel ketene O,O-acetals of the formula I ##STR1## where R.sup.1 is a tertiary alkyl radical of 4 to 6 carbon atoms or unsubstituted or halogen-substituted phenyl, R.sup.2 is hydrogen and R.sup.3 and R.sup.4 independently of one another are each phenyl which is unsubstituted or substituted by halogen, alkoxy, alkyl, phenyl, phenoxy, cyano, nitro or trifluoromethyl, their preparation and their use for the preparation of ketene O,N-acetals.
摘要:
A wood preservative comprises a mixture ofA. N-cyclohexyl-N-methoxy-2,5-dimethyl-furan-3-carboxamide andB. tris-(N-cyclohexyl-diazeniumdioxy)-aluminum.A process for treating wood with this mixture is also described.