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References
1.
European Patent Application 92.302 5605 (Imperial Chemical Industries PLC). Alternative approaches involving insoluble blowing agents and/or emulsions are disclosed in: U.S. patent 4,972,002 (BASF); U.S. patent 4,981,879 (Jim Walters Corporation); and U.S. patent 5,034,424 (Bosch-Siemens).
2.
Cunningham, A.
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1987 . "Recent Advances in the Development of Rigid Polyurethane Foams of Improved Thermal Insulation Efficiency ," Polyurethanes World Congress , Aachen, Everberg : ICI Polyurethanes .