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US 6,284,936 B1Granted
Styrene monomer polymerization inhibition using substituted dihydroxyarenes and nitroxides
AssigneeBaker Hughes Incorporated
InventorMuslim D. Shahid
Life of this patent
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Abstract
It has been discovered that the polymerization of vinyl aromatic compounds, such as styrene, may be inhibited by the addition of a composition that contains an alkyl-dihydroxyarene, a hydrogen transfer agent, and a stable nitroxide. In another, preferred embodiment of the invention, these three components are blended in an organic amine.
Claims16
A method for inhibiting polymerization of vinyl aromatic compounds comprising:
- providing a vinyl aromatic compound;
- and adding thereto an amount effective to inhibit polymerization of the vinyl aromatic compound of a composition comprising:
- a. an alkyl-dihydroxyarene;
- b. a hydrogen transfer agent different from the alkyl-dihydroxyarene, wherein said hydrogen transfer agent is selected from the group consisting of naphthalene, decalin, hydroquinoline, 1,2,3,4-tetrahydronaphthalene, 9,10-dihydroanthracene, fluorene, squalane, squalene, trimethyldihydroquinoline, tetramethylhydroquinoline, and mixtures thereof;
- and
- c. a stable nitroxide.
3 more elements
A polymerization inhibited vinyl aromatic composition comprising:
- a. an alkyl-dihydroxyarene;
- b. a hydrogen transfer agent different from the alkyl-dihydroxyarene, wherein said hydrogen transfer agent is selected from the group consisting of naphthalene, decalin, hydroquinoline, 1,2,3,4-tetrahydronaphthalene, 9,10-dihydroanthracene, fluorene, squalane, squalene, trimethyldihydroquinoline, tetramethylhydroquinoline, and mixtures thereof;
- c. a stable nitroxide;
- and
- d. a vinyl aromatic compound.
2 more elements
A composition for inhibiting polymerization of vinyl aromatic compounds comprising:
- a. an alkyl-dihydroxyarene;
- b. a hydrogen transfer agent different from the alkyl-dihydroxyarene, wherein said hydrogen transfer agent is selected from the group consisting of naphthalene, decalin, hydroquinoline, 1,2,3,4-tetrahydronaphthalene, 9,10-dihydroanthracene, fluorene, squalane, squalene, trimethyldihydroquinoline, tetramethylhydroquinoline, and mixtures thereof;
- and
- c. a stable nitroxide.
1 more element
Dependencies are inferred from the claim text.