Abstract: Process for the production composite articles, comprising the steps of: a) providing a curable mixture comprising: 30-95 wt % of filler material, —5-70 wt % of resin, selected from unsaturated polyester resins, vinyl ester resins, (meth)acrylate resins, and combinations thereof, 0.5-10 phr of at least one peroxyester, 0.1-2.0 phr of at least one organic hydroperoxide, the weight ratio peroxyester/organic hydroperoxide being below 14.0, the curable mixture being essentially free of ketone peroxide, b) shaping the mixture, and c) heating the shaped mixture at a temperature in the range 60-100° C. to affect hardening of the resin and the formation of an article.

Abstract: Process for the preparation of a fiber-reinforced composite material comprising the step of contacting (i) a radically curable resin, (ii) fibers with a total water content of 0.5-20 wt %, based on the total weight of fibers, (iii) at least one transition metal compound selected from manganese, iron, and copper compounds, and (iv) a peroxide.

Abstract: Process for curing an unsaturated polyester resin or vinyl ester resin, the resin comprising a reactive diluent selected from the group consisting of acrylic acid, methacrylic acid, acrylates, methacrylates, acrylamides, methacrylamides, and combinations thereof, said process comprising the addition to said resin of (i) a ketone peroxide selected from the group consisting of methyl isopropyl ketone peroxide, methyl isobutyl ketone peroxide, cyclohexanone peroxide, and combinations thereof and (ii) a compound of a transition metal selected from the group consisting of Mn, Fe, and Cu, and combinations thereof.

Abstract: Accelerator solution suitable for forming a redox system with peroxides, comprising (i) an iron compound selected from iron carboxylates, iron 1,3-dioxo complexes, and iron dicylcopentadienyl complexes, (ii) a compound of a second transition metal; the weight ratio of iron:second transition metal being in the range 3:1 to 200:1, with the proviso that the accelerator solution is essentially free of ascorbic acid.

Abstract: Accelerator solution suitable for forming a redox system with peroxides, comprising (i) a compound of a first transition metal selected from manganese and copper, (ii) a compound of a second transition metal; the weight ratio of first transition metal:second transition metal being in the range 3:1 to 200:1, (iii) a nitrogen-containing base, and (iv) a hydroxy-functional solvent, with the proviso that the accelerator solution does not contain ascorbic acid.

Abstract: Process for the preparation of a fibre-reinforced composite material comprising the step of contacting (i) a radically curable resin, (ii) fibres with a total water content of 0.5-20 wt %, based on the total weight of fibres, (iii) at least one transition metal compound selected from manganese, iron, and copper compounds, and (iv) a peroxide.

Abstract: Accelerator solution suitable for forming a redox system with peroxides, comprising (i) an iron compound selected from iron carboxylates, iron 1,3-dioxo complexes, and iron dicylcopentadienyl complexes, (ii) a compound of a second transition metal; the weight ratio of iron:second transition metal being in the range 3:1 to 200:1, with the proviso that the accelerator solution is essentially free of ascorbic acid.

Abstract: Solution suitable for accelerating the cure of a curable resin using a peroxide, said accelerator solution comprising (i) at least one organic solvent, (ii) a manganese salt, a copper salt, or a combination thereof, and (iii) an iron complex of a tetradentate, pentadentate or hexadentate nitrogen donor ligand.

Abstract: Process for the preparation of an accelerator solution suitable for forming a redox system with peroxides, comprising the steps of heating a liquid formulation comprising a hydroxy-functional solvent and a nitrogen-containing base to a temperature in the range 50-200° C., followed by adding a transition metal salt or complex to said heated formulation.

Abstract: Accelerator solution suitable for forming a redox system with peroxides, comprising (i) a compound of a first transition metal selected from manganese and copper, (ii) a compound of a second transition metal; the weight ratio of first transition metal:second transition metal being in the range 3:1 to 200:1, (iii) a nitrogen-containing base, and (iv) a hydroxy-functional solvent, with the proviso that the accelerator solution does not contain ascorbic acid.

Abstract: Solution suitable for accelerating the cure of a curable resin using a peroxide, said accelerator solution comprising (i) at least one organic solvent, (ii) a manganese salt, a copper salt, or a combination thereof, and (iii) an iron complex of a tetradentate, pentadentate or hexadentate nitrogen donor ligand.

Abstract: The invention pertains to a peroxide composition comprising, based on the total weight of the composition: a) 10-90 wt % of an organic peroxide; b) 90-10 wt % of an organic solvent in which the organic peroxide does not dissolve; and c) optionally additives; wherein the water content is less than 20 wt %.

Abstract: The invention pertains to a peroxide composition comprising, based on the total weight of the composition: a) 10-90 wt % of an organic peroxide; b) 90-10 wt % of an organic solvent in which the organic peroxide does not dissolve; and c) optionally additives; wherein the water content is less than 20 wt %.