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    • 3. 发明专利
    • DE1570293B1
    • 1970-02-05
    • DEB0083393
    • 1965-08-23
    • BRIDGESTONE TIRE CO LTD
    • FURUKAWA JUNJISAEGUSA TAKEOONISHI AKIRAISHIKAWA TAKAOANZAI SHIROIRAKO KOICHINARUMIYA TSUEAKIISHIZUKA YUZO
    • C08F236/04C08D1/12
    • Diolefin copolymers containing a butadiene unit having a high cis-1,4-structure are made by copolymerizng butadiene and a hydrocarbon-radical-substituted butadiene in which the substituents are selected from alkyl, aryl, or cycloalkyl radicals, in the presence of a diluent, at a temperature in the range of -30 DEG C. to 150 DEG C. and under a pressure sufficient to maintain the reaction system in the liquid phase, and a three-component catalyst. The catalyst consists of (A) a metal salt of an organic carboxylic acid of the formula where R is a hydrocarbon radical, M is a metal, and n the valency of the metal, or a hydroxyketone metal complex, or a hydroxy ester metal complex, or a hydroxyaldehyde metal complex, or a hydroxyacid metal complex, or a diketonedioximo metal complex, or an 8-hydroxyquinoline metal complex, or a cyclodiolefin metal complex, or a carbonyl metal complex, and in all cases the metal is nickel or cobalt, (B) boron trifluoride or its complexes with oxygen-containing organic compounds, and (C) an organometallic compound selected from alkyllithiums, dialkylzincs, trialkylaluminiums, and dialkylalkoxy-aluminium compounds. The mole ratio of the (C) component to the (A) component is at least 0.5, and the mole ratio of the (C) component to the (B) component being within the range of 0.1 to 5.0. All or two of the catalyst components are soluble in organic solvents. The comonomer may be isoprene, 2,3-dimethylbutadiene, or 1,3-pentadiene. The copolymers may be made by normal or block techniques. Both of these types of copolymers are exemplified. The copolymerization is preferably effected in a hydrocarbon solvent or diluent. Recovery of the copolymer is by conventional techniques. The Specification contains long lists of catalyst components. Exemplified catalysts are (1) nickel naphthenate, boron trifluoride etherate, and triethyl aluminium, (2) as (1) but nickel salt replaced by acetylacetone nickel, (3) as (1) but nickel salt, nickel 2-ethylhexoate, (4) as (1) but acetylacetone cobalt used instead of Ni salt, (5) as (1) but instead of Ni salt, the ethyl acetoacetonate salt of Ni or Co used, (6) tetracarbonyl Ni, (C2H5)3Al, and BF3 etherate, (7) as (6) but Ni compound replaced by salicylaldehyde Co or Ni, nickel benzoate, or nickel stearate, and (8) acetylacetone Ni, or Ni naphthenate, BF3 etherate, and butyl lithium or diethyl zinc, or diethylmonoethoxy aluminium. The copolymers may be vulcanized.