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US 12,391,791 B2Granted
Thermoplastic polyurethane useful for pneumatic hoses
AssigneeBASF SE
InventorsElmar Poeselt, Dieter Nitschke, Birte Lahrmann, Dirk Kempfert
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Abstract
The present invention relates to a thermoplastic polyurethane obtainable or obtained by the conversion of at least a polyisocyanate composition, propane-1,3-diol as chain extender and a polyol composition, wherein no further chain extender is used aside from propane-1,3-diol, to a process for preparing such a thermoplastic polyurethane, and to the use of such a polyurethane for production of injection molded products, extrusion products, films and shaped bodies.
Claims16
A thermoplastic polyurethane, obtained by conversion of components consisting of:
- (i) methylene diphenyl diisocyanate;
- (ii) a chain extender that is propane-1,3-diol;
- (iii) a polyol which is polytetrahydrofuran;
- (iv) optionally a catalyst which is tin (II) isooctanoate;
- and
- (v) optionally a stabilizer,
- wherein the polyol has a mean functionality in a range of from 1.8 to 2.3,
- the polyol has a molecular weight, Mn, in a range of from 650 to 1400 g/mol,
- the polyol is present in an amount of from 25 to 50.2 wt. %, based on a total polyurethane chain component weight,
- the methylene diphenyl diisocyanate is present in a molar ratio to the chain extender in a range of from 1.16 to 1.6, and
- a molar ratio of a sum total of the functionalities of the polyol and chain extender to a sum total of the functionalities of the methylene diphenyl diisocyanate is in a range from 1:0.8 to 1:1.3,
- wherein the thermoplastic polyurethane has a Shore hardness in a range of from 60 A to 80 D, determined according to DIN 53505, and
- an elongation at break in a range of from 420 to 530%.
10 more elements
Dependencies are inferred from the claim text.