Process for hydrogenation in solution of the double bonds of con

Details Process for hydrogenation in solution of the double bonds of con Process for hydrogenation in solution of the double bonds of con

1995-02-23

1996-12-10

Schofer, Joseph L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253329, 5253311, 5253332, C08F 804

Patent

active

055831850

ABSTRACT:
A process of hydrogenation in solution of polymers of conjugated dienes in the presence of homogeneous catalysts which contain, as an essential component, a titanium compound of the type Cp.sub.2 Ti(PhOR).sub.2, where Cp is a cylopentadienyl group, ph a phenyl group, and OR an alkoxide group containing 1 to 4 carbon atoms; or a titanium compound of the type Cp.sub.2 TiR.sub.2, where R is a Ch.sub.2 PPh.sub.2 group.
These catalysts are very active in the selective hydrogenation of the double bonds of the diene units of polymers or copolymers of conjugated dienes having number-averaged molecular weights or between approximately 500 and 1,000,000 and, in particular, of random and block copolymers of styrene and butadiene or isoprene, the latter containing at least one styrene block and one polybutadiene and/or polyisoprene block.

REFERENCES:
patent: 4501857 (1985-02-01), Kishimoto
patent: 4980421 (1990-12-01), Taremoto
patent: 5141997 (1992-08-01), Chamberlain
patent: 5206307 (1993-04-01), Chamberlain
Beachell, et al, NMR Spectra of Titanocene Sandwich Compounds, Inorganic Chemistry, V4, No. 8, Aug. 1965, pp. 1133-1140.
Calhorda, et al. Enthalpies of Formation of Ti(2-C.sub.5 H.sub.5).sub.2 L.sub.2 Complexes, J. of Organomet. Chem, 225, 1983, pp. 81-86.

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