Random butadiene-isoprene copolymers with a trans-1, 4...

Details Random butadiene-isoprene copolymers with a trans-1, 4... Random butadiene-isoprene copolymers with a trans-1, 4...

2006-07-11

2006-07-11

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...

C526S169200

Reexamination Certificate

active

07074868

ABSTRACT:
A description follows of random butadiene-isoprene copolymers with a trans-1,4 structure, having a butadiene/isoprene molar composition ranging from 98/2 to 32/68, the above copolymers being crystalline or amorphous depending on the isoprene content. The process for the preparation of the above copolymers is also described, in the present of a catalytic system which comprises: (a) a first component consisting of a vanadium compound selected from: (a1) compounds having general formula (Ia) VO(L)n(X)mwherein n is an integer from 1 to 3 and m ranges from zero to 2, n+m being equal to 2 or 3; (a2) compounds having general formula (Ib) V(L)p(X)qwherein p is an integer from 1 to 4, q ranges from zero to 3, the sum of p+q being equal to 3 or 4; wherein L is a bidentate ligand and X is a halogen, preferably Chlorine; (b) a second component selected from aluminoxanes and relative derivatives.

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Giovanni Ricci, et al., “Polymerization of 1,3-dienes with methylaluminoxane-triacetylacetonatovanadium”, Macromolecular Chemistry and Physics, vol. 195, No. 4, pp. 1389-1397 Apr. 1, 1994.

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