Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1998-11-23
1999-09-28
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521128, 521129, 502 25, 502 26, C08G 1822, C08G 1818
Patent
active
059589906
ABSTRACT:
A method for making a rigid polyurethane/polyisocyanurate foam by reacting a polyisocyanate and a polyol in the presence of a trimerization catalyst and a urethane catalyst, a blowing agent and a silicone surfactant characterized by employing as the trimerization catalyst a compound of the following formula:
REFERENCES:
patent: 4675401 (1987-06-01), Robin
patent: 4760099 (1988-07-01), Canaday et al.
patent: 5308883 (1994-05-01), Londrigan et al.
patent: 5324754 (1994-06-01), Valoppi et al.
Air Products and Chemicals Inc.
Foelak Morton
Leach Michael
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