Synthesis of 1,4-trans-polybutadiene using a lanthanide organic acid salt catalyst
AssigneeBridgestone Corporation
InventorThomas J. Lynch
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Abstract
The invention provides a catalyst composition, comprising: (a) an organolithium compound; and, (b) an organic acid salt of lanthanide series element; wherein: (1) only components (a) and (b) are required to promote the synthesis of 1,4-trans-polybutadiene; (2) the ratio of component (a) to component (b) is selected to maximize formation of the trans structure of said 1,4-trans-polybutadiene; and, (3) components (a) and (b) are selected for enabling further diblock synthesis. The invention further contemplates a process for using the catalyst to synthesize 1,4-trans-polybutadiene and other polymers and copolymers having trans configuration in the conjugated diene monomer contributed units.
Claims19
A catalyst composition that is the combination or reaction product of ingredients consisting essentially of:
- (a) an organolithium compound;
- and
- (b) an organic acid salt of lanthanide series element.
A catalyst composition formed by the process comprising the steps of:
- combining ingredients consisting essentially of:
- (a) an organolithium compound;
- and
- (b) an organic acid salt of lanthanide series element.
A composition that is the reaction product or combination of ingredients consisting essentially of:
- (a) an organolithium compound;
- (b) an organic acid salt of lanthanide series element;
- (c) 1,3-butadiene;
- optionally
- (d) diethylzinc;
- and optionally
- (e) a polar diluent.
Dependencies are inferred from the claim text.