Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1997-08-08
1998-07-28
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521131, C08J 914
Patent
active
057864004
ABSTRACT:
The present invention relates to a method of producing a rigid polyurethane foam in which a polyisocyanate containing a benzene ring is used as an organic isocyanate and a polyether polyol and/or polyester polyol is used as a polyol, characterized in that a hydrocarbon is used as the blowing agent and a compound having a hydrophobic group and a hydroxyl group in the molecule is used as an emulsifying agent. The blowing agent is preferably a hydrocarbon selected from the group consisting of cyclopentane, n-pentane and iso-pentane.
REFERENCES:
patent: 5451615 (1995-09-01), Birch
patent: 5624969 (1997-04-01), Seifert et al.
patent: 5684092 (1997-11-01), Seifert et al.
Brock Martin
Hama Teruo
Ikebe Mitsuaki
Foelak Morton
Gil Joseph C.
Sumitomo Bayer Urethane Co. Ltd.
Whalen Lyndanne M.
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