Highly hydrogenated nonfunctional or functional terminated conju

Details Highly hydrogenated nonfunctional or functional terminated conju Highly hydrogenated nonfunctional or functional terminated conju

1992-01-10

1994-01-18

Lipman, Bernard

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

Synthetic resins

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

5253262, 5253267, 5253284, 5253294, 5253303, 5253328, 5253329, 5253331, 5253332, 525338, C08F 804

Patent

active

052800814

ABSTRACT:
In a first embodiment of the present invention, poisoning or deactivation of conventional homogeneous catalysts to be used in hydrogenation of the backbone unsaturation in liquid monofunctional and difunctional-terminated conjugated diene polymers, is prevented by reacting a blocking agent compound with the functional end groups present in these polymers. More specifically, subsequent to formation of a selected starting material monofunctional or difunctional-terminated conjugated diene polymer, a suitable blocking agent is reacted with the functional end groups of the polymer enabling relatively inexpensive titanium, iron, cobalt, or nickel-based homogeneous catalysts to be used in hydrogenating the backbone unsaturation of the polymer to a high degree. Subsequent to hydrogenation, the polymer is subjected to conventional hydrolysis using a mineral acid or base to remove the blocking groups and return the hydrogenated conjugated diene polymer to its original functionality. In a second embodiment, conventional homogeneous catalysts based on cobalt, nickel, titanium, or iron are utilized to hydrogenate low molecular weight liquid copolymers and homopolymers to a high degree. More particularly, butadiene-alkenylpyridine and butadiene-acrylate liquid copolymers and butadiene homopolymers are formed in a conventional manner are hydrogenated using such catalysts.

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