| Characterization: Desmophen VPLS 2388 is a flexibilizing hydroxyl-bearing polyester. It is suitable for use as a co-reactant, primarily with Desmodur® N, in the formulation of two-component polyurethane coatings for plastics, characterized by their resistance to accelerated and outdoor weathering, high film elasticity and good tar resistance; also in the flexibilization of hard coatings, e.g. in industrial applications. Properties / Applications: Desmophen VPLS 2388 is used primarily in combination with Desmodur N 75 and Desmodur N 3390 in the formulation of fast-drying, high-solids, two-component polyurethane coatings characterised by good lightfastness and weather stability, high film elasticity and good tar resistance. Of particular note is the better QUV performance and tar resistance compared with a Desmodur N / Desmophen 670 combination. The film elasticity values are comparable with those yielded by Desmophen 670. On account of the chemical composition of the product, good weather stability can be expected. However, it is generally advisable to add light stabilisers (e.g. Tinuvin® 292 and 1130), especially when formulating clear coats for exterior automotive applications. Combinations with Desmodur N products display good resistance in the standard accelerated tests, e.g. 2,000 h QUV resistance of clear coat on metallic base coat. As with any product, use of Desmophen VPLS 2388 in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability. Information provided by Covestro |
