Sughrue, Rothwell, Mion, Zinn and Macpeak
Method for producing flame- and smoke-resistant polyurethane foam sheet by incorporation of a urea derivative in reaction mixture
 The flexible polyurethane foams having high flame resistance and smoke resistance can be produced by reacting a polyhydroxyl compound and a polyisocyanate with a urea derivative selected from the group consisting of PA0 (a) a compound represented by the general formula ##STR1## wherein at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents hydroxylalkyl, alkoxyalkyl, alkyl and aryl groups and the remainder represents hydrogen atom, and PA0 (b) a urea-formaldehyde condensation product in the presence of a catalyst, a surfactant and a blowing agent. These polyurethane foams can easily provide the favorable foam sheets by compression-molding these foams under heating. 
Bridgestone Tire Co., Ltd.
Y C C
Y10S C08G C08G
additional inventional inventional
Minoru Takashi Toshio Masumi
Kojima Ohashi Yukuta Saito