Abstract: This invention relates to compositions which are crosslinkable by heating to form polyurethane plastics for coating substrates, preferably textile sheet-form materials, in particular by the reverse coating process. For ecological and economic reasons, the coating compositions are free from organic solvent or contain at most 10% by weight of organic solvent and consist essentially of linear and/or branched urethane prepolymers having blocked terminal NCO-groups, aqueous dispersions of urethane polymers, vinyl polymers and/or diene polymers and/or aqueous polymer solutions and aliphatic and/or cycloaliphatic and/or aromatic amines containing at least two primary and/or secondary amino groups as latent crosslinkers. The chain extending or crosslinking reaction takes place at an elevated temperature in a coating tunnel after the coating has been applied to a substrate.

Abstract: The present invention relates to thermosetting two-component coating compositions containing(A) a prepolymer having an average molecular weight of from 1,000 to 15,000 having an average of from 2 to 4 ketoxime-blocked aromatic isocyanate groups;(B) a crosslinking agent corresponding to the following general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represent hydrogen or C.sub.1 - to C.sub.3 -alkyl groups with the proviso that if R.sup.1 to R.sup.4 all are hydrogen, 75% of the diamine have the cis,cis-structure and optionally(C) pigments, fillers blowing agents or other known additives. The equivalent ratio of blocked isocyanate groups to NH.sub.2 groups is from about 1.35:1 to about 0.95:1, and the coating composition contains not more than about 15% by weight of organic solvents and is free from aqueous polymer dispersions or solutions.

Abstract: The instant invention is directed to a process for the production of molded polyisocyanate-based foam products having a compact, light- and yellowing-resistant polyurethane-based top layer comprising the steps of:A. coating a mold with a liquid polyurethane-polyurea-based coating agent, containing a binder, which reacts to form a light- and yellowing-resistant top layer andB. introducing a foamable reaction mixture into said mold,wherein said binder comprises:(i) at least one isocyanate prepolymer having at least two exclusively aliphatically and/or cycloaliphatically bound isocyanate groups and(ii) a hardener mixture composed of water and primary polyamines, at least partly in aldimine- or ketimine-blocked form, which have aliphatically and/or cycloaliphatically bound amino groups.

Abstract: The present invention relates to a process for the production of polyurethane ureas from a prepolymer which contains isocyanate groups and a mixture of hardeners containing amino groups, in the presence of water, and optionally in the presence of solvents, characterized in that the mixture of hardeners comprises compounds corresponding to the following general formulae:H.sub.2 N--R--NH.sub.2 (A)h.sub.2 n--r--n .dbd. r.sub.1 (b)andR.sub.1 .dbd. N--R--N .dbd. R.sub.1 (C)whereinR represents a divalent aliphatic, cycloaliphatic or araliphatic group having from 2 to 18 carbon atoms and optionally also containing --O-- or ##STR1## (wherein X represents H, --CH.sub.3, --C.sub.2 H.sub.5, --C.sub.3 H.sub.7 or --C.sub.4 H.sub.9) andR.sub.

Abstract: This invention relates to new aliphatic diamines containing cyanide groups, a process for their preparation by hydrogenation of the corresponding trinitriles and their use as chain lengthening agents in the isocyanate polyaddition process.

Abstract: The instant invention relates to nitrilediisocyanates of the formula: ##STR1## wherein Ar represents an aromatic hydrocarbon group having 6 to 14 carbon atoms which may contain one or more substituents which are inert towards isocyanate groups andR represents hydrogen or an aliphatic hydrocarbon group having 1 to 4 carbon atomsWhich may be used to prepare lightfast polyurethanes which readily adhere to various substances.

Abstract: Automatic sample preparation method and apparatus for making successive measurements with an analyzer by picking up with a single stepwise movable metering probe, in a first measuring cycle, a sample for measurement from a sample container and a small volume of air; introducing this sample and the air into the inlet of the analyzer; picking up with the same metering probe, in a secondary measuring cycle, a sample for measurement from the same sample container and a small volume of air, and picking up with said metering probe a metered quantity of liquid additive and a second small volume of air; and thence introducing said sample, said liquid additive and said air picked up in the secondary measuring cycle into the inlet of the analyzer.

Abstract: Adhesive compositions based on 2-cyanoacrylate monomers in which storage stability, cure speed and other properties are improved by inclusion of itaconic acid anhydride.