Patent Number: 6,294,638

Title: Soft, transparent and processable thermoplastic polyurethane

Abstract: 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.sub.4 polyether polyol and (B) a C.sub.2 -C.sub.3 polyether polyol where the weight ratio A/B is in the range of about 85/15 to 15/85.

Inventors: Manning; Steven C. (Wheeling, WV), Gracik; Charles S. (McMechen, WV), Mason; Arthur W. (Sistersville, WV), Chan; Jack C. (Coraopolis, PA)

Assignee: Bayer Corporation

International Classification: C08G 18/66 (20060101); C08G 18/00 (20060101); C08G 018/48 (); C08G 018/65 (); C08G 018/66 (); C08G 018/32 (); C08G 018/73 ()

Expiration Date: 09/25/2018