Abstract: Microcapsules and a process for the production of these microcapsules the walls of which consist of polycondensates of a film-forming aliphatic polyisocyanate containing at least one biuret group or polyaddition products thereof with a chain-extending agent.

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: This invention is directed to gels which are stable in storage, comprising a polymer matrix, a liquid dispersing agent embedded therein and optionally fillers or additives, characterized in that said polymer matrix is a polycondensation product of aldehydes and aminoplast-formers, at least 30% by weight of the aminoplast-formers having a molecular weight of between 200 and 10,000 and containing at least one ether, thioether, acetal, ester, urethane and/or carbonate group.

Abstract: Carbonless copying papers of which the donor layer contains microcapsules of a solution of dyestuff precursors in organic solvents as core material and polycarbodiimides as shell material.

Abstract: Production of microcapsules, wherein a film-forming polycarbodiimide with functional terminal isocyanate groups is dissolved in the core material or in an inert solvent and a miscible core material is added and the resulting organic phase is introduced into an immiscible liquid phase which contains a dissolved catalyst for isocyanate reactions, and the microcapsules formed are isolated after the reaction of the shell-forming polymer.

Abstract: An elastic polyurethane foam having a density, sag factor, tensile strength and elongation at break which adapt it for use in upholstery is prepared by reacting a poly(alkylene ether) polyol having at least about 10% by weight of primary hydroxyl groups and hydrazine or a hydrazine adduct with an organic polyisocyanate which contains at least about 50% by weight of distilled tolylene diisocyanate.

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: In an insecticidal article comprising an insecticidally effective amount of at least one volatile phosphoric or thiophosphoric acid ester and a solid polyurethane carrier material, the improvement wherein said polyurethane is an elastomeric polyurethane, whereby the article retains its activity over a long period of time. The polyurethane is formed of a polyisocyanate and a mixture of a long chain polyol and a short chain polyol and/or polyamine.

Abstract: The instant invention is directed to polyurethane foams and the process for their manufacture, wherein an organic polyisocyanate is reacted, in the presence of a blowing agent, with a dispersion of a polyurea and/or a polyhydrazodicarbonamide in a relatively high molecular weight organic compound containing at least one hydroxyl group.

Abstract: This invention is concerned with polymerizable compositions, a process for producing and polymerizing such compositions and the resultant polymerization product. Compositions comprising the reaction product of polycarbodiimides and .alpha.,.beta.-unsaturated carboxylic acids are dissolved in vinyl monomers and subject to free-radical polymerization. The polymerization product may contain up to about 300 weight percent of conventional fillers.

Abstract: Isocyanate polyaddition products which are cross linked via allophanate, biuret, uretdione or uretone imine groups are linearized with liquid lactams or azalactams and their addition products. The invention is particularly useful for the substantial elimination of allophanate, biuret, uretone imine, and uretdione groups in cross linked cellular polyurethane resins.

Abstract: Polyurethane foams which are free from the usual discoloration particularly in the center of a block thereof are prepared from a foamable reaction mixture containingA. a heterocyclic mercapto compound of the formula ##SPC1##In whichX = --o--, --s--, --nh--, --n--(c.sub.1 -c.sub.12)--alkyl, --N--(C.sub.5 -C.sub.6)--cycloalkyl--, --N--phenyl, --N--(C.sub.7 -C.sub.12)--aralkyl, --N--(C.sub.7 --C.sub.12)--alkylaryl-- or --N--CO--(C.sub.1 -C.sub.6)--alkyl, ##EQU1## ##SPC2## R = H, (C.sub.1 -C.sub.12)--alkyl, (C.sub.1 -C.sub.12)--alkoxycarbonyl--, (C.sub.1 -C.sub.12)--alkoxy andB. a phenol of the general formula ##SPC3##In which R.sup.1 and R.sup.3 may be the same or different and denote C.sub.1 -C.sub.9 --alkyl--, C.sub.5 -C.sub.6 --cycloalkyl--, C.sub.7 -C.sub.9 --alkylaryl--, indanyl or norbornyl groups and R.sup.2 = R.sup.1 or --CH.sub.2 --CH.sub.2 --COO--(C.sub.1 -C.sub.12)--alkyl.