Process for producing hydrogenated rubbers

Details Process for producing hydrogenated rubbers Process for producing hydrogenated rubbers

1997-06-20

1999-11-16

Buttner, David

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

Synthetic resins

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

525314, 5253323, 5253329, 5253331, 5253332, 525338, C08C 1902, C08F 602, C08F29702

Patent

active

059859954

ABSTRACT:
Process for producing hydrogenated rubbers which allows an easy and effective deactivation of the living polymer before the hydrogenation step. The deactivation of living polymer is carried out using compounds with very good solubility in water of formula R--OH, R--COOH or compound of type R'.sub.n --Si--Cl.sub.4-n, R'.sub.n --Sn--Cl.sub.4-n, with n comprised between 0 and 3, extremes included; wherein R is a C.sub.2 -C.sub.20 alkyl group optionally containing one or more polar functional groups selected from C--OH, COOH, and R' is a C.sub.1 -C.sub.20 alkyl or C.sub.6 -C.sub.20 aryl. The catalysts used in the hydrogenation of the deactivated polymer are titanocene compounds, being the most preferred those of formula Cp.sub.2 Ti (PhOCH.sub.3).sub.2 and Cp.sub.2 Ti (CH.sub.2 PPh.sub.2).sub.2.

REFERENCES:
patent: 4673714 (1987-06-01), Kishimoto
patent: 4849481 (1989-07-01), Rhodes
patent: 5017660 (1991-05-01), Hattori
patent: 5242986 (1993-09-01), Gibler
patent: 5266647 (1993-11-01), Bender
patent: 5310814 (1994-05-01), Struglinsky

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