Polymerization process for preparing syndiotactic 1,2-polybutadiene
AssigneeBridgestone Corporation
InventorSteven Luo
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Abstract
A process for synthesizing syndiotactic 1,2-polybutaidene, the process comprising the steps of (1) polymerizing monomer consisting essentially of 1,3-butadeine monomer within an organic solvent that includes at least 50% by weight of aliphatic solvent by using an iron-based catalyst composition, where said step of polymerizing occurs at a temperature above about 65° C., thereby forming a supersaturated solution of syndiotactic 1,2-polybutaidene, (2) maintaining the supersaturated solution of syndiotactic 1,2-polybutaidene at a temperature above about 65° C. until isolation of the syndiotactic 1,2-polybutadiene is desired, and (3) isolating the syndiotactic 1,2-polybutaidene from the supersaturated solution.
Claims18
A process for synthesizing syndiotactic 1,2-polybutaidene, the process comprising the steps of:
- (1) polymerizing monomer consisting essentially of 1,3-butadeine monomer within an organic solvent that includes at least 50% by weight of aliphatic solvent by using an iron-based catalyst composition, where said step of polymerizing occurs at a temperature above about 65° C., thereby forming a supersaturated solution of syndiotactic 1,2-polybutaidene;
- (2) maintaining the supersaturated solution of syndiotactic 1,2-polybutaidene at a temperature above about 65° C. until isolation of the syndiotactic 1,2-polybutadiene is desired;
- and
- (3) isolating the syndiotactic 1,2-polybutaidene from the supersaturated solution.
A process for synthesizing syndiotactic 1,2-polybutaidene, the process comprising the steps of:
- (1) polymerizing 1,3-butadiene monomer within an aliphatic solvent by using an iron-based catalyst composition, where said step of polymerizing occurs at a temperature above about 65° C., thereby forming a supersaturated solution of syndiotactic 1,2-polybutaidene;
- (2) maintaining the supersaturated solution of syndiotactic 1,2-polybutaidene at a temperature above about 65° C. until isolation of the syndiotactic 1,2-polybutadiene is desired;
- and
- (3) isolating the syndiotactic 1,2-polybutaidene from the supersaturated solution.
A process for synthesizing syndiotactic 1,2-polyburadiene wherein an iron-based catalyst system is employed to polymerize 1,3-butadiene monomer within an organic solvent comprising an aliphatic solvent, the improvement comprising:
- (1) conducting the polymerization at a temperature above 65° C. to form a supersaturated solution of syndiotactic 1,2-polybutadiene;
- and
- (2) maintaining the supersaturated solution at a temperature above about 65° C. until the isolation of the syndiotactic 1,2-polybutadiene is desired.
Dependencies are inferred from the claim text.