Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1973-12-12
1976-01-06
Hamrock, William F.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 928W, 260879, 260880R, 260 887D, 260 895AW, C08f 704, C08f 376, C08f 1902
Patent
active
039311333
ABSTRACT:
This invention concerns a process for polymerizing ethylenic monomers in aqueous suspension, characterized by the use, as suspension agent, of an inorganic precipitate obtained by coprecipitating a mixture of soluble phosphate and carbonate containing at least 1 gram-ion of CO.sub. 3 .sup.-.sup.- to 3 gram-ions of PO.sub.4 .sup.-.sup.-.sup.- with a soluble salt of the metals in columns IIa and IIb of the periodic table of elements, or of aluminum or iron.
Styrene is preferably polymerized in the presence of a precipitate obtained by the action of calcium caloride on a mixture of sodium phosphate and carbonate containing between 1 gram-ion of CO.sub.3 .sup.-.sup.- to 2 gram-ions of PO.sub.4 .sup.-.sup.-.sup.- and 2 gram-ions of CO.sub.3 .sup.-.sup.- to 3 gram-ions of PO.sub.4 .sup.-.sup.-.sup.- .
The spherical particles of polymer obtained are particularly suitable for the manufacture of expanded polymers.
REFERENCES:
patent: 3047534 (1962-07-01), Dyer et al.
patent: 3068192 (1962-12-01), White
patent: 3100763 (1963-08-01), Melk et al.
patent: 3328374 (1967-06-01), Ronden et al.
Aquitaine Total Organico
Hamrock William F.
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