Powder mixture comprising organic peroxide

Patent metadata

Field	Value
Publication number	US-11220608-B2
Application number	US-201816753581-A
Country	US
Kind code	B2
Filing date	Oct 2, 2018
Priority date	Oct 4, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

Powder mixture comprising 20-80 wt % of one or more powdered organic peroxides selected from the group consisting of dibenzoyl peroxide and substituted dibenzoyl peroxides, 20-80 wt % of a powdered filler material, at least 60 wt %, thereof consisting of a solid inorganic flame retardant, and 0-20 wt % water.

First claim

What is claimed is:

1. A powder mixture comprising:
20-80 wt % of one or more di(methylbenzoyl)peroxides,
20-80 wt % of a powdered filler material consisting of a solid inorganic flame retardant chosen from aluminum trihydroxide, magnesium dihydroxide, and combinations thereof, and
0-20 wt % water,
wherein the total of the one or more di(methylbenzoyl)peroxides and the powdered filler material equals 100 parts by weight.

2. The powder mixture according to claim 1 wherein the one or more di(methylbenzoyl) peroxides is di(4-methylbenzoyl) peroxide.

3. The powder mixture according to claim 1 , wherein the one or more di(methylbenzoyl) peroxides is di(2-methylbenzoyl) peroxide.

4. A process for preparing the powder mixture according to claim 1 , comprising the step of homogenizing the one or more di(methylbenzoyl) peroxides and the powdered filler material.

5. The process according to claim 4 , wherein the homogenized powder mixture has an average particle diameter (d50) below 500 microns.

6. The process according to claim 4 , wherein the powdered organic peroxide contains 0 to 25 wt % of water.

7. The process according to claim 4 , comprising the steps of:
milling the one or more di(methylbenzoyl) peroxides in an aqueous slurry to de-agglomerate the one or more di(methylbenzoyl) peroxides,
removing water from the resulting de-agglomerated one or more di(methylbenzoyl) peroxides, and
homogenizing the de-agglomerated one or more di(methylbenzoyl) peroxides and the powdered filler material.

8. A process for curing a radically curable thermosetting resin, comprising using the powder mixture according to claim 1 as a radical initiator in the process.

9. The process according to claim 8 , wherein the radically curable thermosetting resin is a coating composition.

10. A radical polymerization process comprising initiating polymerization with a powder mixture comprising:
20-80 wt % of one or more di(methylbenzoyl)peroxides,
20-80 wt % of a powdered filler material consisting of a solid inorganic flame retardant chosen from aluminum trihydroxide, magnesium dihydroxide, and combinations thereof, and
0-20 wt % water,
wherein the total of the one or more di(methylbenzoyl)peroxides and the powdered filler material equals 100 parts by weight.

11. The process according to claim 4 , wherein the resulting powder mixture has an average particle diameter (d50) below 200 microns.

12. A powder mixture comprising:
33 to 40 wt % of a peroxide chosen from di(4-methylbenzoyl)peroxide, di(2-methylbenzoyl)peroxide, or combinations thereof,
60 to 67 wt % of aluminum trihydroxide, magnesium dihydroxide, or combinations thereof, and
0 to 10 wt % water based on a total weight of the peroxide,
wherein the total of the peroxide and the aluminum trihydroxide, magnesium dihydroxide, or combinations thereof equals 100 parts.

13. The powder mixture according to claim 12 consisting of:
40 wt % of di(4-methylbenzoyl)peroxide,
60 wt % aluminum trihydroxide, and
10 wt % water based on a total weight of the peroxide,
wherein the total of the peroxide and the aluminum trihydroxide equals 100 parts.

14. The powder mixture according to claim 12 consisting of:
33 wt % of di(4-methylbenzoyl)peroxide, and
67 wt % aluminum trihydroxide.

15. The powder mixture according to claim 12 consisting of:
40 wt % of di(4-methylbenzoyl)peroxide,
60 wt % magnesium dihydroxide, and
10 wt % water based on a total weight of the peroxide,
wherein the total of the peroxide and the magnesium dihydroxide equals 100 parts.

16. The powder mixture according to claim 12 consisting of:
40 wt % of di(4-methylbenzoyl)peroxide, and
60 wt % magnesium dihydroxide.

Assignees

• Nouryon Chemicals Int Bv

Inventors

• Spijkerman Geesje Klasina
• Jansen Martin Hermanus Maria
• Talma Auke Gerardus
• Den Braber Antonie

Classifications

• C09D7/63

  organic · CPC title

• C07C409/34

  both belonging to carboxylic acids · CPC title

• C08K5/14 Primary

  Peroxides · CPC title

• C08J3/223

  Packed additives · CPC title

• C08K13/02 Primary

  Organic and inorganic ingredients · CPC title