Other

Bayer Corporation

Steven C Manning

Hans-Georg Hoppe

Wolfgang Kaufhold

Hans-Georg Wussow

Arthur W Mason

Charles S Gracik

Jack C Chan

Wolfgang Braeuer

A molding composition comprising thermoplastic polyurethane is disclosed. The polyurethane is characterized in having ultimate tensile strength (UTS) and elongation at break (EAB) values after hot storage which are, each, at least 60% of the corresponding value before hot storage, glass transition temperature equal to or lower than &minus;50&deg; C., UTS and EAB values after hydrolytic storage which are, each, at least 80% of the corresponding value before hydrolytic storage, and Shore A hardness of 70 to 95. The polyurethane is a product of a reaction comprising an aliphatic diisocyanate, a mixture of polyols and a chain extender and contains a UV stabilizer, an antioxidant and an optional anti-hydrolysis agent.

Aliphatic thermoplastic polyurethanes, a process for producing them and the use thereof

A soft, transparent and processable thermoplastic polyurethane resin suitable in optical application is disclosed. The resin is the product of reacting a diisocyanate, a chain extender, and a mixture of polyether polyols. The mixture of polyether polyols comprise (A) a C,polyether polyol and (B) a C,-C,polyether polyol where the weight ratio A/B is in the range of about 85/15 to 15/85.

Soft, transparent and processable thermoplastic polyurethane

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Wheeling, WV, United States of America

Steven C Manning