Abstract: A cyanate ester based adhesive comprising component A which has at least one cyanate ester with at least two OCN groups, and component B which comprises at least one catalyst for the trimerisation reaction of OCN groups to form a triazine ring. The catalyst is retained releasably on a carrier, particularly a pyrogenic silica.

Abstract: A two-component adhesive comprising a first component (A) and a second component (B). First component contains a monomeric polyisocyanate, more particularly monomeric diisocyanate, and an isocyanate-terminated prepolymer and/or a prepolymer mixture with isocyanate functionality ?1.7, preferably in the range of 1.7<fNCO<3, more preferably in the range of 2<fNCO<3. The second component contains a di- and/or polyamine, preferably a polyether diamine and/or a polyether polyamine, and also at least one trimerization catalyst. The stoichiometric ratio of isocyanate groups in the first component (A) to isocyanate-reactive hydrogen atoms present in the composition, more particularly reactive hydrogen atoms of the di- and/or polyamine, in the second component (B), is from 7.5 to 25, preferably from 10 to 20, particularly preferably 15. A two-component adhesive of this type has better handling properties and is more versatile and, after hardening, it is strong and has low brittleness.

Abstract: A method for producing a two-component polyurethane composition comprising at least one additive soluble in polar solvents, in particular a biocide, comprising the following steps: a) providing at least one polyol; b) adding at least one solution of the polar solvent comprising at least one additive soluble in polar solvents, in particular a biocide, and at least one carrier material for the additive to the polyol from step a); and c) providing, in accordance with the requirements, at least one isocyanate for adding to the mixture from step b). The method has the advantage that additives can be incorporated into a two-component polyurethane composition without agglomerating or precipitating, without side reactions, and without an additional drying step.

Abstract: The present invention relates to resorbable membranes for medical uses. The membranes according to the present invention are produced or producible from a composition comprising at least one polyol component, at least one polyisocyanate component and an additive selected from polyvinylpyrrolidone, polyvinylpolypyrrolidone, a copolymer of polyvinylpyrrolidone with vinylacetate, vinylimidazole or vinylcaprolactam or mixtures thereof. The present invention further relates to a kit comprising a multitude of membranes with different absorption rates.

Abstract: The present invention relates to a biocompatible, resorbable polyurethane foam wound cover with open pores and an adjustable resorption rate having improved properties when used on skin or connective tissue wounds as well as a method of production of such a polyurethane foam wound cover.