Abstract: A polyisocyanate-based elastomer having a ratio of the storage modulus (E?) at 20° C. and the storage modulus (E?) at 120° C. of between 0.75 and 1.5, a tan ? at 100° C. of less than 0.1 and a maximum value of the tan ? of more than 0.8, the tan ? being the ratio of the loss modulus (E?) and the storage modulus (E?).

Abstract: Process for the preparation of open celled rigid polyurethane or urethane-modified polyisocyanurate foams by reaction of a polyfunctional isocyanate-reactive composition with a polyisocyanate composition comprising a prepolymer of NCO-value 21-30% based on a high molecular weight oxyethylene-containing polyol.

Abstract: Process for the preparation of open celled rigid polyurethane or urethane-modified polyisocyanurate foams by reaction of a polyfunctional isocyanate-reactive composition with a polyisocyanate composition comprising a prepolymer of NCO-value 21-30% based on a high molecular weight oxyethylene-containing polyol.

Abstract: A polyisocyanate-based elastomer having a ratio of the storage modulus (E′) at 20° C. and the storage modulus (E′) at 120° C. of between 0.75 and 1.5, a tan &dgr; at 100° C. of less than 0.1 and a maximum value of the tan &dgr; of more than 0.8, the tan &dgr; being the ratio of the loss modulus (E″) and the storage modulus (E′).

Abstract: A luminair is disclosed which consists of a panel of transparent acrylic material. On at least one surface an array of speckles is formed. A groove 3 is cut into one edge of the panel into which is sunk a light source provided by an elongate array of LED's 6 mounted on a PCB 5 which is fastened in place by the introduction of a hot mett sealant 8. Light generated by the array of LED's is emitted from the speckled surface.

Abstract: A method for the production of polyurethane elastomers by reacting an isocyanate epolymer having an isocyanate content of from 5 to 10% by weight which is the reaction product of an excessive amount of a polyisocyanate containing at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof and a polyether polyol having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 3000, and an oxyethylene content of from 50 to 85% by weight, with an aqueous latex to form a foam, and compressing said foam.

Abstract: Process for the preparation of rigid open celled polyurethane foams comprising the step of reacting an organic polyisocyanate with an isocyanate-reactive material in the presence of a blowing promotor which is an isocyanate-reactive cyclic carbonate or cyclic urea, and in the presence of an aminoalcohol catalyst.

Abstract: Thermal insulating device with an open celled polyurethane foam core, evacuated and refilled with an insulating gas.