Abstract: A biodegradable, pressure sensitive adhesive based on the chemical reaction product of one or more aliphatic polyester polyols having a hydroxyl functionality of between >2 and <4; one or more aliphatic polyester-polyols having a hydroxyl functionality of between >1 and ?2; one or more chain extenders having dual hydroxyl functionalities and having a molecular weight of ?200 g/mo; and, one or more aliphatic diisocyanates; characterized in that the ratio of the total number of isocyanate groups to the total number of hydroxyl groups in the materials used to form the reaction product is between ?0.4 and <1.0, and preferably is between ?0.6 and ?0.9.

Abstract: Surface water drainage Systems are known, comprising a water drainage body which is elongated by individual elements that can be placed next to one another, and which can be installed in the ground. The individual elements (1-6) comprise an inlet section which is arranged in an upper region of the individual elements (1-6) in such a way that water can flow into the inlet section. A first pipe section (20) is provided, arranged below the inlet section and communicating with same via transition Systems. According to the invention, in order to increase the drainage power, at least one further second pipe section (30), communicating with the first pipe section (20), is to be provided below or next to the first pipe section (20), wherein all the pipe sections (20, 30) can be sealingly connected to corresponding pipe sections (20, 30) of further individual elements (1-6).

Abstract: Tacky, biodegradable, chemical reaction product formed from • at least one or more aliphatic polyester-polyols having a hydroxyl functionality of between greater than two and less than four each • at least one or more aliphatic polyester-polyols having a hydroxyl functionality of between less than or equal to two and greater than one each • at least one or more each doubly hydroxyl-functionalized chain extenders having a molecular weight of less than or equal to 200 g/mol each, and • at least one or more aliphatic diisocyanates, characterized in that the ratio of the total number of isocyanate groups to the total number of hydroxyl groups in the compounds introduced for the chemical reaction to form the tacky, biodegradable, chemical reaction product is between greater than or equal to 0.4 and less than 1.0, preferably between greater than or equal to 0.6 and less than or equal to 0.9.