Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1998-03-09
1998-12-15
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521159, C08G 1800, C08J 914
Patent
active
058498079
ABSTRACT:
Rigid polyurethane foams having low thermal conductivity values are produced by reacting an organic polyisocyanate with an organic material having at least two isocyanate reactive hydrogen atoms and an OH value of from about 200 to about 650 in the presence of a blowing agent. The blowing agent is a mixture which includes dichlorofluoroethane (HCFC-141b) and greater than 1.0% by weight (based on total weight of the foam forming mixture) water. The foams obtained are characterized by a thermal conductivity of less than about 0.160 Btu-in./hr.ft.sup.2 .degree. F., preferably less than about 0.150 Btu-in./hr.ft.sup.2 .degree. F. These foams are particularly useful as insulation materials.
REFERENCES:
patent: 5137929 (1992-08-01), Demmin et al.
patent: 5407596 (1995-04-01), Mafoti et al.
Hammel et al, "Decomposition of HCFC-123, HCFC-123a, and HCFC-141b in Polyuretheane Premix and in Foam" Feb. 3, 1992.
Bodnar et al, "Minimization of HCFC-141b Decomposition in Rigid Polyisocyanurate Foams", Oct. 21-24, 1992.
Bayer Corporation
Foelak Morton
Gil Joseph C.
Whalen Lyndanne M.
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