Thermoplastic polyurethanes, use of these material for the preparation of T-frames for intrauterine systems and T-frames made out of this material

A thermoplastic polyurethane elastomer, wherein the elastomer is made of

• a) 1,6-Hexamethylene diisocyanate with a content of 19 to 21 weight-%,
• b) A polycarbonate diol based on a mixture of 1,4-Butane diol and 1,6-Hexane diol with a number average molecular weight between 1900 and 2100 g/mol with a content of 58 to 60 weight-%,
• c) 1,12-Dodecanediol with a content of 18.8 to 20.8 weight-%,
• in the presence of
• e) TIPT catalysts,
• with the addition of
• f) BaSO4 in the range of 0 to 35 wt.-%, based on the weight of the thermoplastic polyurethane made of components a) to d),
• g) Pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate),
• h) optionally, further additives and/or auxiliary substances.

A thermoplastic polyurethane elastomer, wherein the elastomer is made of

• a) 336.00 g 1,6-Hexamethylene diisocyanate,
• b) 1001.79 g DE C 2201,
• c) 4.94 g 1,12-Dodecanediol,
• in the presence of
• e) 0.7 g TIPT catalyst and 4.94 g Pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate),
• with the addition of
• f) 426.4 g BaSO4,
• g) 5.81 g 2′, 3-bis [[3-[3, 5-di-tert-butyl-4-hydroxyphenyl] propionyl]] propionohydrazide, and
• h) 5.81 g Licowax E®.

A thermoplastic polyurethane elastomer, wherein the elastomer is made of

• a) 378.0 g 1,6-Hexamethylene diisocyanate,
• b) 1056.50 g DE C XP 2613,
• c) 354.42 g 1,12-Dodecanediol,
• in the presence of
• e) 0.74 TIPT catalyst and 5.38 g Pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate),
• with the addition of
• f) 426.40 g BaSO4,
• g) 5.81 g 2′, 3-bis [[3-[3, 5-di-tert-butyl-4-hydroxyphenyl] propionyl]] propionohydrazide, and
• h) 5.81 g Licowax E®.