# US 5,347,055 A · Oligomers of styrene as flegmatizers for organic peroxides

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- Number: US 5,347,055 A
- Document ID: US5347055A
- Status: Granted
- Kind: A
- Application number: 08/082,325
- Filed: 1993-06-24
- Granted: 1994-09-13
- Earliest claimed: 1992-06-10
- Assignees: The Dow Chemical Company
- Inventors: Duane B. Priddy; Mehmet Demirors
- Web page: https://patentgrep.com/patent/US5347055A

## CPC

- C08K 5/315: Compounds containing carbon-to-nitrogen triple bonds
- C07C 407/006: {Stabilisation; Use of additives}
- C08K 5/14: Peroxides
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

A flegmatizer, which is an oligomer of styrene or of styrene and at least one comonomer, is admixed with an organic peroxide to reduce the heat- and/or shock-sensitivity of the peroxide. The resulting composition can be employed to polymerize olefinic monomers.

## Claims

### Claim 1

A storage stable organic peroxide composition having reduced heat-and/or shock-sensitivity, the composition comprising an organic peroxide and from about 10 to about 90 percent, based on the total weight of the flegmatizer and the peroxide, of a flegmatizer comprising an oligomer of styrene or an oligomer of styrene and at least one comonomer, the oligomer having from 2 to about 5 repeating units.

### Claim 2 (depends on 1)

The composition of claim 1 wherein the amount of flegmatizer is from about 25 to about 75 weight percent.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the peroxide is a perester, perketal or percarbonate.

### Claim 4 (depends on 1)

The composition of claim 1 wherein the peroxide is di(t-butylperoxy)azelate or t-butyl perbenzoate.

### Claim 5 (depends on 1)

The composition of claim 1 wherein the flegmatizer is an oligomer of strene-acrylonitrile or styrene.

### Claim 6 (depends on 1)

The composition of claim 1 wherein the number of repeating units of the oligomer is from 2 to about 4.

### Claim 7 (depends on 2)

The composition of claim 2 wherein the peroxide is a perester, perketal, or percarbonate, and the flegmatizer is an oligomer of styrene-acrylonitrile or styrene, wherein the number of repeating units is from 2 to about 4.

### Claim 8

A method for reducing the heat- and/or shock-sensitivity of an organic peroxide, the method comprising admixing an organic peroxide with from about 10 to about 90 percent, based on the total weight of the flegmatizer and the peroxide, of a flegmatizer comprising an oligomer of styrene or an oligomer of styrene and at least one comonomer, the oligomer having from 2 to about 5 repeating units.

### Claim 9 (depends on 8)

The method of claim 8 wherein the amount of flegmatizer is from about 25 to about 75 weight percent.

### Claim 10 (depends on 8)

The method of claim 8 wherein the peroxide is t-butyl perbenzoate or di(t-butylperoxy)azelate.

### Claim 11 (depends on 8)

The method of claim 8 wherein the flegmatizer is an oligomer of styrene-acrylonitrile or styrene.

### Claim 12 (depends on 8)

The method of claim 8 wherein the number of repeating units in the oligomer is from 2 to about 4.

### Claim 13 (depends on 8)

The method of claim 8 wherein the flegmatizer is an oligomer of styrene.

### Claim 14 (depends on 1)

The composition of claim 1 wherein the flegmatizer is an oligomer of styrene.

### Claim 15 (depends on 14)

The composition of claim 14 wherein the number of repeating units in the oligomer is from 2 to about 4.

### Claim 16 (depends on 1)

The composition of claim 1 wherein the peroxide is benzoyl peroxide.

### Claim 17 (depends on 1)

The composition of claim 1 wherein the peroxide is 2,5-dimethyl-2,5-bis(benzoylperoxy) hexane.

### Claim 18 (depends on 1)

The composition of claim 1 wherein the comonomer is acrylonitrile.

### Claim 19 (depends on 1)

The composition of claim 1 consisting essentially of the flegmatizer and the peroxide.

### Claim 20

An organic peroxide composition having reduced heat- and/or shock sensitivity, the composition consisting essentially of an organic peroxide and from about 25 to about 75 percent, based on the total weight of the flegmatizer and the peroxide, of a flegmatizer which is an oligomer of styrene or an oligomer of styrene and at least one comonomer, the oligomer having from 2 to about 5 repeating units.