PHOTOCURABLE POLYESTER RESINS OF REDUCED COMBUSTIBILITY

Two cross-linkable monomers, diallyl ether of dibromoneopentylglycol a nd diallyl ether of bromobutendiol, have been used as curing agents fo r unsaturated polyester resins in paint coatings. Both monomers were a cting effectively against oxygen inhibition. Bromine in their molecule s decrease the flammability of the obtained products. Monomers have be en obtained in direct allylation by use of allyl bromide on interphase in the presence of proper catalysts-triethylallylammonium chloride. T he obtained resins were ultraviolet curable. A photocuring system cons isting of mono- or diazide and hydroxyalkylphenone has been applied. T he optimum amount of azide was found to be at 15 wt%.