| 摘要 |
This invention relates to polyurethane compounds, for example, elastomers, which are the reaction product of a cycloaliphatic diisocyanate, a polyol and a chain extender. The cycloaliphatic diisocyanate comprises (i) trans-l,4bis(isocyanatomethyl)cyclohexane or (ii) an isomeric mixture of two or more of cis1,3-bis(isocyanatomethyl) cyclohexane, trans- 1,3-bis(isocyanatomethyl)cyclohexane, cis-1,4- bis(isocyanatomethyl)cyclohexane and trans- l,4bis(isocyanatomethyl) cyclohexane, provided the isomeric mixture comprises at least 5 weight percent of said trans- l,4-bis(isocyanatomethyl)cyclohexane. This invention also relates to shaped and molded articles prepared from said polyurethane compounds.
|
