1460137 Flame-proofed polyurethane foam SOC NATIONALE DES POUDRES ET EXPLOSIFS 5 May 1975 [13 May 1974] 18747/75 Heading C3R [Also in Division C2] A flame-proofed polyurethane foam is obtained by using as at least part of the polyol reactant in the production of the polyurethane a diolphosphonate diester of the formula wherein R 1 is C 1 -C 4 alkyl, R 2 is H, CH 3 or C 2 H 5 and A is -CH 2 -CH 2 -CH 2 - or Examples are given for the production of rigid polyurethane foams from (a) a mixture of toluene diisocyanate (mixed 2,4 and 2,6-isomers) and 4,4SP1/SP-diisocyanatodiphenyl methane and various of the diol phosphonates and (b) from a mixture containing 4,4SP1/SP-diisocyanatodiphenyl methane or toluene diisocyanate, a trimethylolpropnae epoxidized by means of propylene oxide and various of the diol phosphonates.
展开▼
