No abstract

Polyallyl ethers of glycol glycosides and sorbitol were prepared and halogenated by the addition of Br2, Cl2, CCI4, and HOCI. Since these products have at least one free hydroxyl per molecule and 20 to 64% halogen, they were evaluated as reactive flame-retardant (FR) additives for polyurethane foams. Although the halogenated products have high viscosities, they dissolve in blowing agents and polyethers to yield formulations with acceptable viscosities for producing low density foams useful for insulation. The HOCI adducts have acceptable hydroxyl numbers for producing foams without any added polyol, whereas the other adducts, having low hydroxyl numbers, require blending with conventional polyethers to be suitable. At low levels of halogen, both CCI4 and HOCI adducts are significantly more effective as FR in foams than those made by direct addition of free halogen.