Styrene → Styrenemaleic anhydride

HRID 223589Notes

Reaction equation

[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.[C:9]1(=[O:15])[O:14][C:12](=[O:13])[CH:11]=[CH:10]1>>[CH:1]([C:10]1=[CH:11][C:12]([O:14][C:9]1=[O:15])=[O:13])=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1

Participants

Reactant 2

HCID 7501Styrene2×

HCID 7923Maleic Anhydride2×

Product 1

HCID 54215275Styrenemaleic anhydride

Procedure

U.S. Pat. No. 4,145,375 teaches a process for copolymerizing styrene and maleic anhydride by the steps of gradually mixing maleic anhydride with styrene in a mass stage under polymerizing conditions to form styrene-maleic anhydride polymer and then suspending the styrene-rich mixture in water, the styrene polymerization is completed as in a conventional mass/suspension polymerization system. Following polymerization, polymeric beads are separated from the water and dried. The disclosure indicates that after drying, the beads are likely to contain internal moisture and in addition approximately 15% of the bound maleic anhydride may be present in the acid rather than anhydride form, and, consequently, during extrusion, the acid portion reverts to the anhydride with the elimination of water. The disclosure indicates that a well-vented extruder is needed to produce a bubble-free extrudate.

Workup

customunder polymerizing conditions

Sources & evidence

ORD record: ord-610f8b95bbec40378b000962a26d1f0d
Source dataset: uspto-grants-1982_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04355157

Reaction notes

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