Patent ID: 6831135
Filing Date: 2004-12-14
Classification: C08C,C08F

Abstract:
A process for the hydrogenation of olefin double bonds present in polymers and copolymers of conjugated dienes, which oomprises putting said polymer or copolymer of conjugated dienes in contact with hydrogen, in an inert solvent and in the presence of a catalytic system, wherein said catalytic system esentially consists of one or more titanium compounds defined by formula (I) wherein:M is selected from Ti(III), Ti(IV), or combinations thereof; Râ€³ is selected from (i) an organic or inorganic radical of an anionic nature, different from cyclopentadienyl or cyclopentadienyl substituted, or (ii) an oligomeric group having general formula (II); the groups R1, R2, R3, R4, R5, each independently represent atoms or radicals linked to the cyclopentadienyl group coordinated to the metal M, and are selected from hydrogen, organic substituent of said cyclopentadienyl group; R6 is selected from: (a) an inorganic anion, (b) a hydrocarbyl group having from 1 to 20 carbon atoms, or (c) Râ€²; â€œwâ€  has the value of 0 or 1, according to the valence of Titanium; Râ€² consists of an oligoiueric group having the following formula (II): âˆ’(AxDyUz)RIâ€ƒâ€ƒ(II) wherein:A represents any monomeric unit derived from a vinylaromatic group polymerizable by means of anionic polymerization, having from 6 to 20 carbon atoms; D represents any monomeric imit derived from a conjugated diolefin polymerizable by means of anionic polymerization, having from 4 to 20 carbon atoms; U represents any generic optional-monomeric unit derived from an unaaUnted compound co-polymerizable with any of the above-mentioned conjugated diolefins D or vinylaromatic compounds A; RI represents a hydrocarbyl group having from 1 to 20 carbon atoms, any index â€œxâ€  and â€œyâ€  can be independently zero or an integer, provided the sum (x+y) is equal to or higher than 2; â€œzâ€  can be zero or an integer between 1 and 20.