Aqueous solid diacyl peroxide suspension
View Patent ↗Aqueous suspension comprising 35-45 wt % of solid diacyl peroxide particles having a d50 in the range 1-10 microns, 0.05-1 wt % of a dispersant, and not more than 1 wt % of an organic solvent. This concentrated peroxide suspension comprises only a minor amount of dispersant, has a low volatile organic content and is nonetheless stable for months and low in viscosity.
1. An aqueous suspension comprising:
35-45 wt % of solid diacyl peroxide particles having a d50 particle size in the range 1-10 microns,
0.05-0.8 wt % of a dispersant, and
not more than 1 wt % of an organic solvent,
wherein the solid diacyl peroxide is a substituted or unsubstituted dibenzoyl peroxide; and
wherein the dispersant is selected from the group consisting of fully or partly hydrolyzed polyvinyl acetates and their copolymers, polyvinylpyrrolidone, alkyl or aryl sulfonates, alkyl or aryl benzenesulfonates, alkyl or sulphates, and mixtures thereof.
2. The aqueous suspension according to claim 1 consisting of 35-45 wt % of solid diacyl peroxide particles having a d50 particle size in the range 1-10 microns, 0.05-0.8 wt % of a dispersant, 0-1 wt % of an organic solvent, 0-1 wt % of an anti-settling agent, 0-0.5 wt % of a pH buffer, and balance of water.
3. The aqueous suspension according to claim 1 , wherein the aqueous suspension has a viscosity of 800 mPa·s or less, measured at 22±3° C.
4. The aqueous suspension according to claim 1 , wherein the aqueous suspension has a shelf-life time of at least two months.
5. The aqueous suspension according to claim 1 , wherein the aqueous suspension has a volatile organic content (VOC) of 15 g/l or less.
6. A process for the production of a high polymer, the process comprising dosing the aqueous suspension according to claim 1 to a reactor.
7. The process according to claim 6 wherein the high polymer is polystyrene.
8. The aqueous suspension according to claim 2 , wherein the aqueous suspension has a viscosity of 800 mPa·s or less, measured at 22±3° C.
9. The aqueous suspension according to claim 2 , wherein the aqueous suspension has a shelf-life time of at least two months.
10. The aqueous suspension according to claim 3 , wherein the aqueous suspension has a shelf-life time of at least two months.
11. The aqueous suspension according to claim 2 , wherein the aqueous suspension has a volatile organic content (VOC) of 15 g/l or less.
12. The aqueous suspension according to claim 3 , wherein the aqueous suspension has a volatile organic content (VOC) of 15 g/l or less.
13. The aqueous suspension according to claim 4 , wherein the aqueous suspension has a volatile organic content (VOC) of 15 g/l or less.
14. The aqueous suspension according to claim 1 , wherein the dispersant is present in an amount in the range from 0.07 to 0.8 wt %.
15. A process for the production of a high polymer, the process comprising dosing the aqueous suspension according to claim 14 to a reactor.
16. The process according to claim 15 wherein the high polymer is polystyrene.