Aliphatic thermoplastic polyurethanes, a process for producing them and the use thereof
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United States of America Patent
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May 6, 2003
Grant Date -
Dec 20, 2001
app pub date -
Nov 22, 1999
filing date -
Nov 22, 1999
priority date (Note) -
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Abstract
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 -50.degree. 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.
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