Powder mixture comprising organic peroxide
View Patent ↗Powder mixture comprising: −20-90 wt % of one or more powdered organic peroxides and −10-80 wt % of one or more powdered filler materials, at least 60 wt % thereof being barium sulphate.
1. Powder mixture comprising:
20-90 wt % of one or more powdered organic peroxides and
10-80 wt % of one or more powdered filler materials, at least 60 wt % thereof being barium sulphate.
2. Powder mixture according to claim 1 wherein the powder mixture comprises 1-30 wt % of water.
3. Powder mixture according to claim 1 wherein the organic peroxide is selected from the group consisting of dibenzoyl peroxide, substituted dibenzoyl peroxides, di (tert-butylperoxyisopropyl)benzene, dicumyl peroxide, di(dichlorobenzoyl)peroxides, diisopropyl peroxydicarbonate, di(t-butylcyclohexyl)peroxydicarbonate, dicetyl peroxydicarbonate, dimyristyl peroxydicarbonate, and didecanoyl peroxide.
4. Powder mixture according to claim 3 wherein the organic peroxide is selected from the group consisting of dibenzoyl peroxide and substituted dibenzoyl peroxides.
5. Powder mixture according to claim 4 wherein the organic peroxide is di(4-methylbenzoyl) peroxide.
6. Powder mixture according to claim 1 wherein barium sulphate contains primary particles with an average particle size (d50) in the range 0.5-3 microns.
7. Process for the preparation of a powder mixture according to claim 1 wherein 20-90 wt % of one or more powdered organic peroxides and 10-80 wt % of one or more powdered filler materials, at least 60 wt % thereof being barium sulphate, are homogenized and de-agglomerated until an average particle diameter (d50) below 200 microns is reached.
8. Process according to claim 7 wherein the powdered organic peroxide contains 5-70 wt % of water.
9. Process according to claim 7 wherein the organic peroxide is selected from the group consisting of dibenzoyl peroxide, substituted dibenzoyl peroxides, di(tert-butylperoxyisopropyl)benzene, dicumyl peroxide, di(dichlorobenzoyl)peroxides, diisopropyl peroxydicarbonate, di (t-butylcyclohexyl)peroxydicarbonate, dicetyl peroxydicarbonate, dimyristyl peroxydicarbonate, and didecanoyl peroxide.
10. Process according to claim 9 wherein the organic peroxide is selected from the group consisting of dibenzoyl peroxide and substituted dibenzoyl peroxides.
11. Process according to claim 10 wherein the organic peroxide is di(4-methylbenzoyl) peroxide.
12. Coating composition comprising the powder mixture according to claim 1 .
13. A method of curing a radically curable thermosetting resin comprising the step of curing the radically curable thermosetting resin with the powder mixture of claim 1 .
14. A method of curing a coating composition comprising the step of curing the coating composition with the powder mixture of claim 1 .
15. A method for radical polymerization comprising the step of initiating the radical polymerization with the powder mixture of claim 1 .