Bayer Materialscience Ag

Bayer Oy

Faisal Shafiq

Christian Wamprecht

Heikki Lyytikäinen

Ilkka Jutila

Wolfgang Kaufhold

Ulla Calvo Alonso

Taina Tjäder

Harri Jukarainen

Henricus Peerlings

Pirjo Kortesuo

Hannu Nikander

Pirjo Inki

Juha Lehtinen

Eeva Lukkari-Lax

Joachim Moede

Pirjo Sallinen

Markus Broich

David Pucket

The present invention relates to novel intrauterine systems and to methods for manufacturing these systems. An intrauterine system according to the invention comprises a reservoir and a continuous, closed and flexible frame. The frame comprises a thermoplastic polyurethane elastomer made of a polycarbonate diol, 1,6-hexamethylenediisocyanate, and a chain extender.

Intrauterine system

This invention concerns thermoplastic polyurethane mouldings with improved surface resistance (resistance to writing and scratching) and very good technical processability as well as their use.

Thermoplastic polyurethanes and their use

Light-stable, thermoplastic polyurethanes with good processability and having an ASTM D-1003 haze value of less than 10%, the polyurethane prepared by a process comprising: reacting: (a) a diisocyanate component comprising 1,6-hexamethylene diisocyanate; (b) a chain extension component consisting of (b1) 1,4-di(&#x3b2;-hydroxyethyl)hydroquinone and (b2) at least one chain extender selected from the group consisting of diols having a 2 or 3 carbon atom chain length between the two OH groups, in a molar ratio of chain extender (b1) to chain extender (b2) of 10:1 to 1:4; and (c) at least one polyol component having a number average molecular weight of 450 to 10000 g/mol, and an average number of Zerewitinoff-active hydrogen atoms of at least 1.8 to at most 3.0; wherein the ratio of isocyanate groups in component (a) to isocyanate-reactive groups in components (b) and (c) is 0.9:1 to 1.1:1.

Transparent thermoplastic polyurethanes having low haze and good processability, methods of making the same, and uses therefor

Growing community of inventors

Krefeld, Germany

Faisal Shafiq