Abstract: The instant invention is directed to novel color and hydrolytically stable thermoplastic polyester urethanes. The invention broadly consists of adding 2-oxazolidones to the components of the polyurethane, or to the polyurethane itself.

Abstract: The instant invention is directed to a process for the production of polyurethane foams wherein organic polyisocyanates are reacted with active hydrogen containing compounds, wherein either the polyisocyanate or the active hydrogen containing compound or both are used in the form of sedimenting, redispersible dispersions containing homogeneous i.e. non-foamed aminoplast /condensates as the dispersed phase.

Abstract: The instant invention is directed to novel low temperature, storage stable liquid diphenylmethane diisocyanates and to the method of their preparation. The diisocyanates of the instant invention are produced by reacting diphenylmethane diisocyanates having a specified 2,4'-isomer content with propylene glycol or poly-1,2-propylene ether glycols. It has been surprisingly found that the products of the instant invention are both stable and liquid at -5.degree. C for at least 48 hours. In fact, in many instances, the products of the instant invention show no tendency to crystallize even when stored at -22.degree. C for weeks.

Abstract: The instant invention is directed to novel low temperature, storage stable liquid diphenylmethane diisocyanates and to the method of their preparation. The diisocyanates of the instant invention are provided by reacting diphenylmethane diisocyanates having a specified 2,4'-isomer content with polyoxyethylene glycols having molecular weights of from 150 to 1500. It has been surprisingly found that the products of the instant invention are both stable and liquid at -5.degree. C for at least 48 hours. In fact, in many instances, the products of the instant invention show no tendency to crystallize even when stored at -22.degree. C for 100 hours.

Abstract: The instant invention relates to a new process for splitting up polyurethane waste into activated polyhydroxyl compounds which may be reused for the production of polyurethane plastics. The process broadly comprises reacting the polyurethane waste with lactams or equilibrium associates of lactams and active hydrogen containing compounds at temperatures of from 150.degree. to 250.degree. C. If desired, the process may be conducted under elevated pressure.

Abstract: This invention relates to new catalyst combinations having improved catalytic activity for isocyanate polyaddition reactions. The catalysts are combinations of known metal catalysts with aromatic compounds which contain at least one nitrogen atom as a hetero atom and have at least one primary amino group in the ortho- or para-position to the hetero atom. Preferred aromatic compounds include ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 which may be the same or different, each represent a hydrogen atom, an aliphatic hydrocarbon group having from 1 to 6 carbon atoms or an aromatic hydrocarbon group having from 6 to 12 carbon atoms or two of the groups R.sub.1 to R.sub.4 represent a condensed aromatic ring.

Abstract: The instant invention relates to an apparatus for the continuous production of foam plastic blocks of a rectangular cross-section, in particular based on polyurethane. The apparatus generally comprises an endless conveyor belt whose upper run is provided with side walls, an unwinding device for a bottom and side sheet to cover the upper run of the belt and the side walls, a levelling device in the form of a roller or a doctor, which extends transversely in relation to the conveyor, a mixture application device and an unwinding device for a sheet to cover the mixture applied.

Abstract: The instant invention relates to a process for the production of crosslinked plastics comprising reacting organic polyisocyanates, organic polyhydroxyl compounds and olefinically unsaturated monomers, optionally in the presence of catalysts and/or other auxiliaries and additives, wherein(a) the polyhydroxyl compounds used are olefinically unsaturated polyhydroxyl polyesters with OH-numbers in the range of from 200 to 1000, molecular weights in the range of from 200 to 800 and double bond contents of from 0.1 to 0.5 gram equivalents of C.dbd.C double bonds per 100 g of polyester;(b) the olefinically unsaturated monomers used are olefinically unsaturated compounds with no more than one isocyanate-reactive group and boiling points in the range of from 40.degree. to 250.degree. C, the monomers being employed in such quantities that, for every olefinically unsaturated double bond in the polyhydroxyl compound (a) there are from 0.

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: The instant invention relates to hydroxyl polyethers which are modified with amide groups and a method of their manufacture. The method includes a first stage wherein a portion of the hydroxyl groups of a polyether polyol are aminated and a second stage wherein the amine groups are reacted with a carboxylic acid, its anhydride, ester or halide. The modified polyesters may be used for the production of polyurethane resins.

Abstract: The invention relates to a method of making branched polysiloxane-polyoxyalkylene copolymers and to their use as stabilizers in the production of polyurethane foam plastics. The copolymers are made by reacting specified organopolysiloxanes with polyisocyanates, heat treating the NCO-containing addition products to cause branching and reacting the branched NCO-containing addition products with monofunctional polyethers. The copolymers can be used to stabilize polyurethane foam reaction mixtures.

Abstract: The instant invention is directed to a process for the preparation of multinuclear aromatic polyamines by condensation of aromatic amines with formaldehyde in the presence of aqueous acid catalysts followed by neutralization of the catalyst and processing of the resulting reaction mixture in known manner, characterized in that free amine is removed from the reaction mixture leaving the last condensation stage by means of a hydrophobic solvent, optionally after partial neutralization of the catalyst but before neutralization of the total quantity of catalyst put into the process, and the amine thus removed is returned to the catalyst-containing aqueous phase by return of the resulting amine-containing solvent phase into said aqueous, catalyst-containing phase at any point before the last condensation stage.

Abstract: The instant invention relates to a method and apparatus for measuring the proportion of undissolved gas in a liquid component for the production of foam materials, particularly those based on polyurethanes. The method is based on the equation of state of ideal gases (Boyle-Mariot Law: p.multidot.v = constant) at constant temperatures. The gaseous portion of a liquid component charged with gas increases its volume under expansion according to the above equation. The gas expansion also increases the liquid volume. The differences in the volumes, of the liquid at two differing pressures is therefore a measurement of the quantity of gas present in the liquid. The apparatus consists of a closed graduated measurement vessel being connected to a variable pressure means capable of producing at least two different defined pressures.

Abstract: The instant invention is directed to stable dispersions and the process of their manufacture. The stable dispersions of the instant invention comprise polyureas and/or polyhydrazo-dicarbonamides as the disperse phase in an hydroxyl group containing material selected from the group consisting of polyethers, polyesters, polyester amides, polycarbonates, and mixtures thereof, and are produced by reacting (1) organic polyisocyanates with (2) polyamines containing primary and/or secondary amino groups and/or hydrazines and/or hydrazides in (3) the hydroxyl group containing material. Component (3) may also contain relatively low molecular weight polyols and/or inert organic solvents. Components (1), (2) and (3) are continuously introduced into a flow mixer in such a quantity that the average residence time in the mixer is less than ten minutes.

Abstract: The present invention relates to a new process for the partial carbodiimidization of the isocyanate groups of organic mono-, or di- and/or polyisocyanates, the mixtures which can be obtained by this process and the use of these mixtures as isocyanate components in the production of polyurethane plastics by the known isocyanate polyaddition process. In general, the process comprises:(a) mixing organic mono-, di- and/or polyisocyanates with 0.1 to 100 ppm of a phosphorus compound of the general formula ##STR1## wherein R represents a lower alkyl radical, a phenyl radical, an alkoxy radical, a hydrogen atom or an alkenyl radical; a, b, c and d each represent hydrogen, a halogen atom, a lower alkyl, lower alkenyl, phenyl, a cyclohexyl or a polymethylene group which together with two neighboring C-atoms of the heterocyclic ring forms a cycloaliphatic ring; and X represents an oxygen or sulphur atom; at a temperature from about 0.degree. to about 200.degree. C.