Peroxide composition
AssigneePPG Industries, Inc.
InventorRobert H. Tang
Life of this patent
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Abstract
Dispersions of organic peroxide, e.g., organic peroxydicarbonates, in an aqueous medium are stabilized against homolytic peroxide decomposition at temperatures of from about -5.degree. C. to 20.degree. C. by incorporating into the dispersion, e.g., into the organic peroxide phase, from about 0.05 to about 1 mole percent, basis the organic peroxide, of diphenyl peroxydicarbonate or di(alkyl substituted) phenyl peroxydicarbonate.
Claims22
A peroxide composition comprising:
- (a) from about 10 to about 65 weight percent organic peroxide dispersed in an aqueous medium containing sufficient surfactant to provide a stable dispersion, and
- (b) from 0.05 to 1 mole percent, basis the organic peroxide, of diphenyl peroxydicarbonate stabilizer represented by the graphic formula:
- ##STR9## wherein R.sub.1 is a C.sub.1 -C.sub.4 alkyl and m is 0, 1, 2, or 3, said amount of diphenyl peroxydicarbonate being sufficient to reduce the rate of self induced homolytic decomposition of the organic peroxide at temperatures of from 0.degree. C. to +5.degree. C.
In the method of polymerizing ethylenically unsaturated monomers wherein an organic peroxide is used as an initiator for the polymerization, the improvement which comprises using as the organic peroxide a peroxide composition of
- (a) from about 10 to about 65 weight percent organic peroxide dispersed in an aqueous medium containing sufficient surfactant to provide a stable dispersion, and (b) from 0.05 to 1 mole percent, basis the organic peroxide, of diphenyl peroxydicarbonate stabilizer represented by the graphic formula:
- ##STR12## wherein R.sub.1 is a C.sub.1 -C.sub.4 alkyl and m is 0, 1, 2, or 3, said amount of diphenyl peroxydicarbonate being sufficient to reduce the rate of self induced homolytic decomposition of the organic peroxide at temperatures of from 0.degree. C. to +5.degree. C.
Dependencies are inferred from the claim text.