§
Luxuse
Patent Intelligence
Sign In
Patent US3726933A successfully refreshed from Google Patents.
← Back to Patent Explorer
US3726933A Expired / Lapsed US ⏱️ 0.0 years remaining

Alkaline earth metal organometallic compounds and method for making the same

Assignee: Aerojet Rocketdyne Holdings Inc
•
Filing: 1971-01-18
•
Granted: 1973-04-10
•
Expires: 1991-01-18
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Orgoanometallic compounds of high carbanion yield are prepared by metallation with alkaline earth metals such as beryllium, barium, strontium, magnesium, calcium or radium or mixture of the same of certain acidic organic compounds having a pKa value of from about 15 to 35 on the MSAD scale in the presence of protic polar solvents, e.g., barium dissolved in monomethyl amine and reacted with triphenyl methane to yield trityl barium. Such organometallic compounds formed by metal-hydrogen exchange reaction are useful in initiating anionic growth-type polymerization of monomers, e.g., alkylene oxides and vinyl compounds, to form homopolymers and copolymers. The persistence of polymer carbanions created by such catalysts makes possible the controlled preparation of a variety of polymers, including block and telechelic polymers.

Inventors

  • 👤 R Smith
  • 👤 S Nielsen

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 19:36
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12; C07; C07F; C07F3/00; C07F3/02; C08F; C08F4/00

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 52 words
The method according to claim 1 in which there is additionally present during the reaction a liquid hydrocarbon solvent having a pKa value of greater than about 35 on the MSAD scale and in an amount by volume of up to 50 percent of the volume of the protic polar amine solvent.
Claim 2
Dependent Claim 17 words
The method according to claim 1 in which the operating temperature is from about -100* to +25*C.
Claim 3
Dependent Claim 107 words
The method according to claim 1 in which the weakly acidic organic compound is selected from the group consisting of xanthene, cyclopentadiene, indene, 9-phenyl xanthene, triphenylmethane, acetylene, phenyl acetylene, 1,3,3-triphenyl propene, fluorene, sym-tetraphenyl ethane, 9-phenyl fluorene, 9-(alpha naphthyl) fluorene, 9-(2-methoxy phenyl) fluorene, 9-(alpha naphthyl)xanthene, 9-(2-methoxy phenyl) xanthene, bis(2-methoxy phenyl) methane, 1,1,4,4-tetraphenyl butane, 1,1,2-triphenyl ethane, 1,1-diphenyl alkanes in which the alkane group has from one to 10 carbon atoms, and alpha, alpha, omega, omega tetraphenyl alkanes in which the alkane group has not over 12 carbon atoms, and mixtures of the same and in which the metal is selected from the group consisting of barium, strontium and calcium.
Claim 4
Dependent Claim 10 words
The method of claim 4 where the metal is barium.
Claim 5
Dependent Claim 11 words
The method of claim 5 where the organic compound is xanthene.
Claim 6
Dependent Claim 12 words
The method of claim 5 where the organic compound is 1,1,2,2-tetraphenyl ethane.
Claim 7
Dependent Claim 12 words
The method of claim 5 where the organic compound is triphenyl methane.
Claim 8
Dependent Claim 12 words
The method of claim 5 where the organic compound is 1,1,4,4-tetraphenyl butane.
Claim 9
Dependent Claim 13 words
The method of claim 5 where the organic compound is 1,1,6,6-tetraphenyl hexane. 11.

References Cited (Backward Citations)

US2835712A Cited
US2788377A Cited
US3365404A Cited
US3509067A Cited
US3535355A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-04-09 1976-10-09 1977-04-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-04-09 1980-10-09 1981-04-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-04-09 1984-10-09 1985-04-10 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag