Chung Yueh Lin

US Patent:

49962426, Feb 26, 1991

Filed:

May 22, 1989

Appl. No.:

7/355539

Inventors:

Chung Y. Lin - Orange CT

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08K 500

US Classification:

521131

Abstract:

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