| 摘要 |
<p>Disclosed are mixed halocarbon blowing agents comprising (1) halocarbons boiling below 10 DEG C, (2) halocarbons boiling between 20 DEG C and 35 DEG C, and (3) inert organic liquids having a boiling point of from 35 DEG C to 125 DEG C. Also disclosed are blends of the above mixed blowing agents with active hydrogen-containing compounds, particularly polyols and the rigid closed cell foams prepared from such blends. Up to 60 percent reduction in hard halocarbons is realized with the mixed blowing agents.</p> |
