UNGESÄTTIGTES POLYESTERHARZ ODER VINYLESTERHARZ ENTHALTENDE ZUSAMMENSETZUNGEN

The present invention relates to a method of providing unsaturated polyester resin or vinyl ester resin compositions containing a phenolic inhibitor and showing a reduced gel-time drift tendency, wherein first a primary resin composition containing a phenolic inhibitor is produced with the phenolic inhibitor being selected from the group of phenolic compounds of which the O-H bond dissociation enthalpy is in the range of from 78 to 91 kcal/mol, and wherein in a further step an N-oxyl radical compound is added to said primary unsaturated polyester resin or vinyl ester resin composition. In a preferred embodiment of the invention, in addition to the N-oxyl radical compound, also an amount of an amine compound is being added. The present invention further also relates to objects and structural parts prepared from such unsaturated polyester or vinyl ester resin compositions. by curing. These can suitably be used in the field of chemical anchoring, construction, roofing, flooring, windmill blades, containers, tanks, pipes, automotive parts, boats, etc.