| abstract |
A non-elastomeric polyurethane composition which includes a first chain extender of the general formula (I)whereinR1, R2, R3, R4, R5, and R6 are the same or different and selected from an optionally substituted straight chain, branched or cyclic, saturated or unsaturated hydrocarbon radical;R7 is a divalent linking group or an optionally substituted straight chain, branched or cyclic, saturated or unsaturated hydrocarbon radical; andn is 0 or greater, and a second chain extender. |