Investigations are reported on the polymerization kinetics of an unsaturated polyester resin, containing both styrene and acrylonitrile (AN), and on the possibility of making it water-dilutable in order to use it for impregnating organic fibre materials. It is found that the unsaturated polyester resin, containing 31 wt.- styrene, can be diluted with almost no limits with acrylonitrile, but when the quantity of acrylonitrile is up to 14 the products are homogeneous and mono-phase. After alkalizing with ammonium, the unsaturated polyester resin, containing acrylonitrile, becomes soluble in water in which it forms a fine emulsion. On polymerization of the resin, phase reversal takes place, water remaining dispersely included in the hardened resin. The copolymerization rate as a function of the water quantity is studied. References: 9
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