Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1997-03-27
1998-06-16
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526206, 526214, 5263171, C08F 480, C08F 200, C08F 2006
Patent
active
057672105
ABSTRACT:
This process is characterized by the fact that at least one of the said monomers is polymerized or copolymerized in bulk, solution, emulsion or suspension, at a temperature that can be as low as 0.degree. C., in the presence of an initiation system including: at least one compound generating radicals, other than bromofluorene, and at least one catalyst consisting of a complex of palladium in the 0 oxidation state, denoted by the following formula (I): Pd(0)L.sup.1 L.sup.2 L.sup.3 L.sup.4 in which each of L.sup.1, L.sup.2, L.sup.3 and L.sup.4, which are identical or different, denotes a ligand which may be a chiral ligand, which is chosen from PRR'R", P(OR)(OR')(OR"), NRR'R", ORR', SRR', SeRR', AsRR'R", SbRR'R", where each of R, R' and R" independently denotes a C.sub.1 -C.sub.14 alkyl group, optionally substituted, or an optionally substituted aromatic group, it being possible for at least two of these ligands to be joined to one another by one or more divalent radicals.
REFERENCES:
patent: 3331827 (1967-07-01), McCall et al.
patent: 4145486 (1979-03-01), Haag et al.
Otsu, "New Initiator Systems for Radical Polymerization of Vinyl Monomers", Polymer Letters, vol. 5, 697-701, 1967.
Dubois Philippe
Jerome Robert
Lecomte Philippe
Senninger Thierry
Teyssie Philippe
Cheng Wu C.
Elf Atochem S.A.
Schofer Joseph L.
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