| abstract |
The invention relates, if appropriate, to active substance-containing, essentially water-free gel compositions, optionally with a depot effect, consisting of a polyurethane matrix and higher molecular weight polyols as dispersants and optionally active ingredients, a process for the preparation of the gel compositions, optionally in the presence of the active ingredients. Biocides, pharmaceuticals, essential oils, fragrances, colors, cleaning agents, anti-aging agents, lubricants and antistatic agents and others can be used as active ingredients. Furthermore, the use of the gel masses as impression and filling masses as well as active substance carriers with a depot effect is described.n n n a) ein oder mehrere Di- undioder Polyisocyanate mit b) einer oder mehreren Polyhydroxylverbindungen mit einem Molekulargewicht zwischen 1000 und 12 000 und einer OH-Zahl zwischen 20 und 112, c) 0,1 bis 50 Gew.-% an Wirkstoffen, bezogen auf a - e, gegebenenfalls d) Katalysatoren für die Reaktion zwischen Isocyanat-und Hydroxylgruppen, sowie gegebenenfalls e) aus der Polyurethanchemie an sich bekannten Füll-und Zusatzstoffen umsetzt, nwobei die Isocyanatkennzahl zwischen 15 und 60 liegt, das Produkt der Funktionalitäten der Polyurethanbildenden Komponenten mindestens 5,2 beträgt und die Polyhydroxylverbindungen im wesentlichen frei an Hydroxylverbindungen mit einem Molekulargewicht unter 800 sind.The process is characterized in that a) one or more di- and / or polyisocyanates with b) one or more polyhydroxyl compounds with a molecular weight between 1000 and 12,000 and an OH number between 20 and 112, c) 0.1 to 50 wt .-% of active ingredients, based on a - e, if appropriate d) catalysts for the reaction between isocyanate and hydroxyl groups, and optionally e) converts fillers and additives known per se from polyurethane chemistry, wherein the isocyanate index is between 15 and 60, the product of the functionalities of the polyurethane-forming components is at least 5.2 and the polyhydroxyl compounds are essentially free of hydroxyl compounds with a molecular weight below 800. |