Studies on polyurethanes and polyurethane-ureas derived from divalent metal salts of mono(hydroxybutyl) hexolate

Divalent metal salts of mono(hydroxybutyl)hexolate [M(HBH)(2)), M = Ca2+, M n2+ or Pb2+] were synthesized by the reaction of 1,4-butanediol, 5,6,7,8,10 ,10-hexachloro-3a,4,4a,5,8,8a, octahydro-5,8-methanonaphtho-[2,3-C]-furan-1 ,3-dione and divalent metal acetates. Hexamethylene bis [N'-(1-hydroxy-2-me thyl-prop-2-yl)urea] (HBHMPU) and tolylene 2,4-bis[N'-(1-hydroxy-2-methyl-p rop-2-yl)urea] (TBHMPU) were synthesized by reacting 2-amino-2-methyl-propa n-l-ol with hexamethylene diisocyanate (HMDI) and tolylene 2,4-diisocyanate (TDI), respectively, in toluene solvent. Flame-retardant metal-containing polyurethanes were synthesized by the solution polymerization of HMDI with M(HBH), and the polyurethane-ureas by reacting HMDI with 1:1 mixture of M(H BH), and HBHMPU or TBHMPU, respectively, in DMSO as solvent. The polymers h ave been characterized by elemental analysis, solubility, viscosity and IR and H-1 NMR spectroscopy. The thermal stability of the polymers has been st udied by thermogravimetry. The flame-retardant property of the polymers has been investigated by measuring limiting oxygen index values. (C) 2000 Soci ety of Chemical Industry.