| 摘要 |
The instant invention is directed to novel low temperature, storage stable liquid diphenylmethane diisocyanates and to the method of their preparation. The diisocyanates of the instant invention are produced by reacting diphenylmethane diisocyanates having a specified 2,4'-isomer content with propylene glycol or poly-1,2-propylene ether glycols. It has been surprisingly found that the products of the instant invention are both stable and liquid at -5 DEG C for at least 48 hours. In fact, in many instances, the products of the instant invention show no tendency to crystallize even when stored at -22 DEG C for weeks. |
