| 摘要 |
Disclosed are mixed halocarbon blowing agents comprising (1) halocarbons boiling below 10.degree.C, (2) halocarbons boiling between 20.degree.C and 35.degree.C, and (3) inert organic liquids having a boiling point of from 35.degree.C to 125.degree.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.
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