Diaroyl peroxide compositions

{
  "publication_number": "US5334326A",
  "country": "US",
  "kind": "A",
  "title": "Diaroyl peroxide compositions",
  "abstract": "The use of alkyl benzoates in which the alkyl group has 8 to 12 carbon atoms, to prepare diaroyl peroxide compositions with improved stability and good processing characteristics is disclosed.",
  "claims": [
    "1. A stabilized paste or liquid dispersion comprising: (1) a diaroyl peroxide, (2) a liquid alkyl ester of benzoic acid in which the alkyl group of the ester has from 8 to 12 carbon atoms, and (3) water from 0.0 to 40% by weight; said diaroyl peroxide is readily dispersible and essentially insoluble, and the ratio of said diaroyl peroxide to the said alkyl benzoate is from 0.3-1 to 7-1.",
    "2. The composition of claim 1 in which the diaroyl peroxide is benzoyl peroxide.",
    "3. The composition of claim 2 in which the alkyl group has from 9 to 11 carbon atoms.",
    "4. The composition of claim 3 in which the alkyl group has 10 carbon atoms.",
    "5. The composition of claim 4 in which alkyl benzoate is isodecyl benzoate.",
    "6. The composition of claim 5 in which the ratio of benzoyl peroxide to isodecyl benzoate is from 6-1 to 1.25-1.",
    "7. A stabilized paste or liquid dispersion consisting essentially of: (1) a diaroyl peroxide, (2) a liquid alkyl ester of benzoic acid in which the alkyl group of the ester has from 8 to 12 carbon atoms, and (3) water from 0.0 to 40% by weight; said diaroyl peroxide is readily dispersible and essentially insoluble, and the ratio of said diaroyl peroxide to the said alkyl benzoate is from 0.3-1 to 7-1."
  ],
  "description_excerpt": "This invention relates to new compositions of diaroyl peroxides with improved chemical stability utilizing medium chain length alkyl benzoates.\n\nThis invention further relates to the preparation of liquid and paste compositions of diaroyl peroxides particularly dibenzoyl peroxide, utilizing alkyl benzoates as a vehicle in which the alkyl group has between 8 to 12 carbon atoms.\n\nDiaroyl peroxides and especially dibenzoyl peroxide are employed For many uses such as polymerization initiators in the preparation of vinyl polymers, curing agents for unsaturated resins and as bleaching agents. Most diaroyl peroxides and particularly dibenzoyl peroxide are hazardous in the dry crystalline form and therefore require a phlegmatizer or desensitizer to facilitate their safe handling. While solid diluents are used in a few applications diaroyl peroxides are commonly formulated as a paste or as a liquid suspension in order to facilitate their use and make them commercially acceptable.\n\nA range of vehicles which also function as phlegmatizers, have been employed in the preparation of the compositions. One of the earliest was tricresyl phosphate which still is very useful for a few applications but has been replaced in most uses. Vehicles which are most commonly used are esters of ortho-phthalic acid such as butyl benzyl phthalate, dibutyl phthalate and diisobutyl phthalate. Benzoates of glycols particularly dipropylene glycol dibenzoate have also been employed.\n\nThe diaroyl peroxides such as benzoyl peroxide when manufactured, are small granules which are agglomerates of many very fine crystals.",
  "cpc": [
    "C07C 407/006"
  ],
  "ipc": [
    "C07C 407/00",
    "C07C 409/00"
  ],
  "assignees": [
    "Norac Co"
  ],
  "inventors": [
    "John V. Bostick"
  ],
  "filing_date": "1991-07-29",
  "publication_date": "1994-08-02",
  "grant_date": "1994-08-02",
  "priority_date": "1991-07-29",
  "application_number": "US-73706991-A",
  "family_id": "24962461",
  "cited_by_count": 28,
  "citations": [
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    "US3723336A",
    "USRE28818E",
    "US3795630A",
    "US4255277A",
    "US4465755A"
  ]
}