Catalytic system for the preparation of polybutadienes and...

Details Catalytic system for the preparation of polybutadienes and... Catalytic system for the preparation of polybutadienes and...

2006-06-06

2006-06-06

Teskin, Fred (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S153000, C526S161000, C502S104000, C502S117000, C502S132000

Reexamination Certificate

active

07056998

ABSTRACT:
The present invention relates to a catalytic system usable for the preparation of polybutadienes by polymerisation, to a process for the preparation of said catalytic system and to a process for the preparation of polybutadienes by means of this catalytic system.A catalytic system according to the invention is based on at least:a conjugated diene monomer,an organic phosphoric acid salt of one or more rare earth metals, said salt being in suspension in at least one inert, saturated and aliphatic or alicyclic hydrocarbon solvent,an alkylating agent consisting of an alkylaluminium of formula AlR3or HAlR2, the “alkylating agent:rare earth salt” molar ratio being greater than 5, anda halogen donor which belongs to the family of alkylaluminium halides with the exception of alkylaluminium sesquihalides,and, according to the invention, said catalytic system comprises said rare earth metal(s) in a concentration equal to or greater than 0.005 mol/l.

REFERENCES:
patent: 6437205 (2002-08-01), Miller et al.
patent: 0 304 088 (1989-02-01), None
patent: 0 846 707 (1998-01-01), None
patent: 02/38636 (2002-05-01), None
Monakov et al., “Investigation of the Polymerization of Isoprene in the Presence of Catalyst System Containing Lathanide Salts”, Doklady Physical Chemistry, Consultants Bureau, New York, nY, USA, vol. 234, No. 5, pp. 587-589 (1977).

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