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US4255543A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the preparation of 1,2-polybutadiene

Assignee: JSR Corp
•
Filing: 1979-08-15
•
Granted: 1981-03-10
•
Expires: 1999-08-15
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Abstract

Abstract In the preparation of 1,2-polybutadiene with a vinyl content of at least 70% by contacting 1,3-butadiene with a catalyst consisting of: (A) a cobalt compound, (B) an organic phosphine compound, (C) a trialkylaluminum compound, and (D) water in an amount of 0.1 to 1.2 moles per mole of said trialkylaluminum, in the presence of a molecular weight regulator, (E) an alkylaluminum halide compound is used as the molecular weight regulator in an amount of at least 0.01 mole per mole of the trialkylaluminum compound (C), whereby 1,2-polybutadiene with a regulated molecular weight can be produced without causing decreased polymerization activity and change of vinyl content and crystallinity of the produced polymer. The alkylaluminum halide compound (E) is preferably used in an amount of 0.05 to 1.0 mole per mole of the trialkylaluminum compound (C).

Inventors

  • 👤 Kenya Makino
  • 👤 Toshio Miyabayashi
  • 👤 Noboru Ohshima
  • 👤 Yasumasa Takeuchi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 19:32
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/06

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 95 words
A process for preparing 1,2-polybutadiene with a vinyl content of at least 70% by contacting 1,3-butadiene with a catalyst consisting of (A) a cobalt compound, (B) an organic phosphine compound, (C) a trialkylaluminum compound and (D) water in an amount of 0.1 to 1.2 moles per mole of said trialkylaluminum in the presence of a molecular weight regulator, characterized in that as the molecular weight regulator, (E) an alkylaluminum halide compound is allowed to be present in the reaction system in an amount of at least 0.01 mole per mole of the trialkylaluminum compound (C).
Claim 2
Dependent Claim 95 words
A process for preparing 1,2-polybutadiene with a vinyl content of at least 70% by contacting 1,3-butadiene with a catalyst consisting of (A) a cobalt compound, (B) an organic phosphine compound, (C) a trialkylaluminum compound and (D) water in an amount of 0.1 to 1.2 moles per mole of said trialkylaluminum in the presence of a molecular weight regulator, characterized in that as the molecular weight regulator, (E) an alkylaluminum halide compound is allowed to be present in the reaction system in an amount of at least 0.01 mole per mole of the trialkylaluminum compound (C).
Claim 3
Dependent Claim 26 words
A process according to claim 1, wherein the alkylaluminum halide compound (E) is added in an amount of 0.01-1.5 mole per mole of the trialkylaluminum (C).
Claim 4
Dependent Claim 26 words
A process according to claim 1, wherein the alkylaluminum halide compound (E) is added in an amount of 0.05-1.0 mole per mole of the trialkylaluminum (C).
Claim 5
Dependent Claim 44 words
A process according to claim 1, 2 or 3, wherein the alkylaluminum halide compound (E) is a compound represented by the formula: AlR 3-n X n (wherein R is an alkyl group, X is a halogen, and n is a number defined by 1≦n≦2).
Claim 6
Dependent Claim 37 words
A process according to claim 1, 2 or 3, wherein the alkylaluminum halide compound (E) is dimethylaluminum chloride, diethyaluminum chloride, diethylaluminum bromide, diethylaluminum iodide, diisobutylaluminum chloride, dihexylaluminum chloride, ethylaluminum sesquichloride, ethylaluminum sesquibromide, ethylaluminum dichloride or ethylaluminum dibromide.
Claim 7
Dependent Claim 23 words
A process according to claim 1, 2 or 3, wherein the alkylaluminum halide compound (E) is diethylaluminum chloride, ethylaluminum sesquichloride or ethylaluminum dichloride.

References Cited (Backward Citations)

US3498963A Cited
US3522332A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-03-09 1984-09-08 1985-03-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-03-09 1988-09-08 1989-03-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-03-09 1992-09-08 1993-03-10 $7700.00 Window Closed / Lapsed

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