| 摘要 |
A polyurethane elastomer having a density of from 100 to 1100 kg/m<3>, and an abrasion loss of less than 300 mg, as determined in accordance with Test Method A of ISO 4649. Such elastomer can be prepared by reacting a urethane-modified polyisocyanate with at least one polyol in the presence of from 1.1 to 10 parts per 100 parts by weight of polyol of a liquid polybutadiene comprising 1,2-butene, 2,3-(trans)butene and 2,3-(cis)-butene moieties, wherein the 1,2-butene content is less than 50 percent, based on total butene content, and the 2,3(cis)-butene content is greater than the 2,3-(trans)butene content.
|
