| 摘要 |
Reaction injection moulded (RIM) elastomers derived from high molecular weight amine-terminated polyethers, a chain extender and a polyisocyanate exhibit improved tear strength and mould release properties when they include an acid of the formula… R(CO2H)n… where n = 1 to 3, and where R has at least 10-n carbon atoms and is a saturated or unsaturated aliphatic (linear or branched), cycloaliphatic, aliphatic-aromatic, aromatic-aliphatic, or aromatic group, unsubstituted or substituted by one or more hydroxyl, chloro, bromo, ester, ether, nitro or amide groups. …<??>The RIM elastomers are useful, for example, as automobile body parts. |
