Abstract: The flame retardance of polyurethane foams is improved by dispersing in a polyol used to make the urethane foam a finely divided resin composition composed of 60-85 wt % of an aminoplast resin filled with 40 to 15 wt % of an aminoplast resin filled with 40 to 15 wt % of cellulose fiber.

Abstract: A fibre and method of making the fibre. The fibre consists at least in part of a cationic amino-formaldehyde resin and may also include a carrier material which is a water-soluble fibre-forming polymer.Fibres can be made by a wet-spinning method. An aqueous solution of the resin is mixed with an aqueous solution of polyvinyl alcohol to form a spinning solution and the spinning solution is extruded into a coagulation bath to form a fibre, which is dried and cured.The cationic amino-formaldehyde resin comprises the reaction product of a triazine, optionally urea, and formaldehyde and a compound, such as di- or tri-ethanolamine to render the resin cationic. It may be mixed with another cationic amino-formaldehyde resin, e.g. a cationic urea-formaldehyde resin, in the making of the fibre.

Abstract: A method of making a cured foamed amino formaldehyde product utilizes an amino formaldehyde precondensate of water content below 20% by weight in order to obtain a less brittle product. A liquid foamable composition is made by dispersing a curing catalyst and a blowing agent in the precondensate and the composition is heated to cause the blowing agent to form a foam and the precondensate to cure.

Abstract: A method for the manufacture of an aminoformaldehyde resin. An amino compound is reacted with formaldehyde or paraformaldehyde in the liquid phase the latter being ensured by the presence of a reactive modifier in the reaction mixture. The reactive modifier comprises an amino-formaldehyde resin which is capable of reaction with further monomers and capable of rendering the mixture of reactants liquid at least at the temperature at which the reaction is to be carried out.

Abstract: A method for the manufacture of amino-formaldehyde resins of low water content. Amino compound and formaldehyde or paraformaldehyde are reacted at a temperature about 60.degree. C. in the liquid phase, the liquid phase being ensured by a reactive modifier. The reactive modifier is a compound which is capable of taking part in the reaction, and also capable of modifying the mixture of reactants to be liquid at the temperature at which the reaction is to be carried out.

Abstract: A liquid storage installation comprising a tank and a bund below the tank is provided with means for rendering rupture of the tank less dangerous by filling the bund, or by covering the bund and optionally also the tank, with a body of a permeable material capable of absorbing liquid from the tank; preferably the permeable material is an aminoplast foam.