Mouldings of thermoplastic polyurethanes exhibiting reduced fogging
AssigneeBayer Aktiengesellschaft
InventorsWolfgang Kaufhold, Hans-Georg Hoppe, Wolfgang Rohrig
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Abstract
A moulded article comprising thermoplastic polyurethane (TPU) that exhibits reduced fogging is disclosed. Characterized in having condensate value of <2 mg/10 g of TPU in accordance with the fogging test of DIN 75201B, the TPU is the product of reacting A) an organic diisocyanate, with B) polyester polyol that contains less than 0.2% of 1:1 ring esters of dicarboxylic acid and diol and C) a chain extender. The moulded article is particularly suitable for use in the automotive sector.
Claims10
A moulded article comprising thermoplastic polyurethane (TPU), said article characterized in having condensate value of <2 mg/10 g of TPU in the fogging test according to DIN 75201B at 120° C. over 16 hours, wherein TPU is the product of reacting, optionally in the presence of a catalyst,
- A) an organic diisocyante, with
- B) polyester polyol having number average molecular weight of 600 to 10 000 g/mol and content of 1:1 ring esters of dicarboxylic acid and diol of <0.2% relative to the weight of said polyester polyol, and
- C) at least one chain extender having average molecular weight of 60 to 500 g/mol, selected from the group consisting of diol and diamine.
- wherein the equivalence ratio of diisocyanate A) to polyol B) is between 1.5:1.0 and 10.0:1.0 and wherein the NCO index is 95 to 105.
Dependencies are inferred from the claim text.