Abstract: Microcapsules, and especially suspensions of microencapsulated colorants well adapted for the manufacture of carbonless papers, are produced by emulsifying a hydrophobic organic fluid which includes an aliphatic diisocyanate and an isocyanurate ring trimer of an aliphatic diisocyanate, and optionally a dissolved organic material, in an essentially aqueous liquid containing a protective colloid, a surfactant, or both, wherein the weight ratio of aliphatic diisocyanate/trimer ranges from 0.05/l to 0.70/l and the surface tension between the aqueous phase and the hydrophobic organic phase ranges from 0 to 20 mN/m, and then forming microcapsules by interfacially reacting a polyamine with the emulsion which results, thereby constituting polyurea walls of said microcapsules by polyaddition.

Abstract: A variety of materials, e.g., colorants, agricultural chemicals, pharmaceuticals, etc., are conveniently microencapsulated within polyurea skin membranes by interfacial polyaddition, by emulsifying a polyisocyanato hydrophobic liquid in an essentially aqueous medium, said polyisocyanato hydrophobic liquid comprising dissolved material to be microencapsulated, an aliphatic diisocyanate (i) and an isocyanurate ring trimer (ii) of an aliphatic diisocyanate, the ratio by weight of said diisocyanate (i) to said trimer (ii) ranging from 0.05/1 to 0.70/1, and then interfacially reacting a polyamine therewith. The resulting suspension of microcapsules is well adapted, e.g., for the production of carbonless papers.

Abstract: Compositions based on red phosphorus and a phenolformaldehyde polycondensate.These compositions contain from 50 to 95% by weight of red phosphorus and from 5 to 50% by weight of a thermoplastic phenol-formaldehyde polycondensate of molecular weight between 120 and 1,500, wherein the molar ratio of formaldehyde to phenol is between 0.7 and 0.9.These compositions are intended for the flameproofing of plastics and do not evolve toxic products during use.

Abstract: Compositions for the flameproofing of plastics, said compositions containing from 0.1% to 20% by weight, relative to the plastic, of red phosphorus in the form of particles having a mean diameter less than 200.mu., encapsulated in a polymer which does not have a melting point or softening point below 90.degree. C., and which has a molecular weight greater than 2,000.

Abstract: Compositions based on red phosphorus and epoxy resin for flame proofing plastics without the release of toxic products during use. The compositions consist of a pulverulent mixture containing from 50 to 95% by weight of red phosphorus and from 5 to 50% by weight of compounds having epoxy groups in their chain.

Abstract: Compositions for flameproofing plastics without the release of toxic products during use in which compositions consist of a pulverulent mixture containing from 50 to 95% by weight of red phosphorous and from 5 to 50% by weight of polymers having unsaturated malenoid, fumaroid or allyl bonds.