Syndiotactic 1,2-polybutadiene latex
AssigneeThe Goodyear Tire & Rubber Company
InventorsGary L. Burroway, George F. Magoun, Ramesh N. Gujarathi
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Abstract
This invention reveals a technique for preparing syndiotactic 1,2-polybutadiene latex. It more specifically discloses a process for synthesizing syndiotactic 1,2-polybutadiene latex by polymerizing 1,3-butadiene in an aqueous medium in the presence of (1) at least one emulsifier, (2) a catalyst emulsion composition which is prepared by a microfluidization or microemulsification process, and (3) at least one member selected from the group consisting of carbon disulfide and phenyl isothiocyanate. Such syndiotactic 1,2-polybutadiene latices can be utilized in preparing blends of syndiotactic 1,2-polybutadiene with rubbers which are prepared by emulsion polymerization.
Claims20
A process for producing a syndiotactic 1,2-polybutadiene latex which comprises polymerizing 1,3-butadiene monomer in an aqueous medium in the presence of (1) at least one emulsifier;
- (2) a catalyst emulsion composition which is comprised of (a) at least one cobalt compound selected from the group consisting of (i) .beta.-ketone complexes of cobalt, (ii) .beta.-keto acid ester complexes of cobalt, (iii) cobalt salts of organic carboxylic acids having 6 to 15 carbon atoms, and (iv) complexes of halogenated cobalt compounds of the formula CoX.sub.n, wherein X represents a halogen atom and n represents 2 or 3, with an organic compound selected from the group consisting of tertiary amine alcohols, tertiary phosphines, ketones and N,N-dialkylamides, and (b) at least one organoaluminum compound of the formula AlR.sub.3 wherein- R represents a hydrocarbon radical of 1 to 6 carbon atoms, wherein said catalyst emulsion composition is microencapsulated in a polyene product and wherein said catalyst emulsion composition is microfluidized in an oil to a particle size which is within the range of about 10 nanometers to about 1000 nanometers:
- and (3) at least one member selected from the group consisting of carbon disulfide and phenyl isothiocyanate.
A process for preparing a syndiotactic 1,2-polybutadiene latex by emulsion polymerization which comprises polymerizing 1,3-butadiene monomer in an aqueous reaction mixture which is comprised of (1) water, (2) at least one emulsifier, (3) 1,3-butadiene monomer, (4) a catalyst emulsion composition which is prepared by dissolving in an inert organic solvent containing at least one polyene (a) at least one cobalt compound selected from the group consisting of (i) .beta.-ketone complexes of cobalt, (ii) .beta.-keto acid ester complexes of cobalt, (iii) cobalt salts of organic carboxylic acids having 6 to 15 carbon atoms, and (iv) complexes of halogenated cobalt compounds of the formula CoX.sub.n, wherein X represents a halogen atom and n represents 2 or 3, with an organic compound selected from the group consisting of tertiary amine alcohols, tertiary phosphines, ketones and N,N-dialkylamides, and (b) at least one organoaluminum compound of the formula AlR.sub.3 wherein R represents a hydrocarbon radical of 1 to 6 carbon atoms to produce a catalyst component solution, and microfluidizing the catalyst component solution with an oil, a surfactant, and water to an average particle size which is within the range of about 10 nanometers to about 1000 nanometers;
- and (5) at least one member selected from the group consisting of carbon disulfide and phenyl isothiocyanate.
Dependencies are inferred from the claim text.