CASTING COMPOUNDS BASED ON POLYURETHANE

摘要

The invention relates to a polyol mixture which comprises as components a1) at least one fat-based polyol, a2) at least one polyetherol having a number average molecular weight of from 500 to 2000 g/mol and a3) if appropriate one or more crosslinkers having a number average molecular weight of from 90 to 400 g/mol, where x) the number average molecular weight of component a1) differs by not more than 400 g/mol from the number average molecular weight of component a2) and xi) components a1) and a2) do not differ from one another in OH functionality by more than 0.5. These polyol mixtures can be employed to produce polyurethane-based embedding compositions. The invention additionally relates to embedding compositions based on the polyol mixtures (A) described at the outset and at least one modified isocyanate (B) and to the use of the embedding compositions as potting material. The invention further relates to a process for producing the embedding compositions as described at the outset. The invention additionally relates to dialysis filters which comprise the embedding compositions described at the outset. Finally, the invention relates to the combination of components (A) and (B) which are present separately but are to be used together.