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US3965078A Expired / Lapsed US ⏱️ 0.0 years remaining

Procedure for the production of polymers and copolymers of isobutylene

Assignee: SnamProgetti SpA
•
Filing: 1974-09-06
•
Granted: 1976-06-22
•
Expires: 1994-09-06
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Abstract

Abstract A method is described for the polymerization of isobutylene and, in particular, the copolymerization of isobutylene and isoprene to produce butyl rubber, by contacting the monomers with a catalyst prepared from: (a) an organoaluminum compound (e.g. Al(C 2 H 5 ) 2 Cl) and (b) a compound represented by the formula X' n M e Y m in which X' is a halogen atom; Y is oxygen, sulphur or a functional group selected from the alkoxies, esters, amides, simple or substituted alkyls, cycloalkyls, aromatics, arenes, phosphines, acetylacetones and oximes; Me is an element selected from Ti, Sn, Zn, B, Al, Hg, Pb, W, Sb, Ge, V, Zr, As, Bi and Mo; n and m are whole numbers whose sum equals the valence of Me except where Y is oxygen or sulphur, when the valency equals 2m + n, (e.g. Ti(O nC 4 H 9 )Cl 3 ), in a liquid reaction medium constituted by an aliphatic, aromatic, cycloaliphatic or halogenated hydrocarbon such as methyl chloride, and at a temperature in the range from -100° to 30°C.

Inventors

  • 👤 Aldo Priola
  • 👤 Sebastiano Cesca
  • 👤 Giuseppe Ferraris

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 01:38
CPC Classifications
C; C08; C08F; C08F10/00; C08F210/00; C08F210/04; C08F210/08; C08F210/10; C08F210/12

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 134 words
Process for the production of copolymers of isobutylene and a conjugated diene wherein the copolymerization reaction is conducted in the presence of a catalyst system consisting of: a. a metalorganic compound of aluminum having the formula AlR 2 X, wherein X is a halogen atom and R is a hydrocarbon radical having from 1 to 10 carbon atoms or hydrogen; and b. a compound selected from the group consisting of Ti(OnC 4 H 9 )Cl 3 , Ti(OCOCH 3 ) 2 Cl 2 , Si(CH 3 )Cl 3 , SiHCl 3 , Sn(C 2 H 5 ) 3 Cl, Sn(C 2 H 5 )Cl 3 , Sn(CH 3 ) 2 Cl 2 , Sn(C 6 H 5 ) 3 Cl, Sn(OCOCH 3 ) 2 Cl 2 and Sn(C 2 H 5 )Cl 3 .
Claim 2
Dependent Claim 134 words
Process for the production of copolymers of isobutylene and a conjugated diene wherein the copolymerization reaction is conducted in the presence of a catalyst system consisting of: a. a metalorganic compound of aluminum having the formula AlR 2 X, wherein X is a halogen atom and R is a hydrocarbon radical having from 1 to 10 carbon atoms or hydrogen; and b. a compound selected from the group consisting of Ti(OnC 4 H 9 )Cl 3 , Ti(OCOCH 3 ) 2 Cl 2 , Si(CH 3 )Cl 3 , SiHCl 3 , Sn(C 2 H 5 ) 3 Cl, Sn(C 2 H 5 )Cl 3 , Sn(CH 3 ) 2 Cl 2 , Sn(C 6 H 5 ) 3 Cl, Sn(OCOCH 3 ) 2 Cl 2 and Sn(C 2 H 5 )Cl 3 .
Claim 3
Dependent Claim 28 words
Process according to claim 1 wherein the polymerization reaction is effected in the presence of a reaction median selected from the aliphatic, aromatic, cycloaliphatic, mono- and poly-halogenated hydrocarbons.
Claim 4
Dependent Claim 13 words
Process according to claim 2 wherein the reaction medium used is methyl chloride.
Claim 5
Dependent Claim 18 words
Process according to claim 1 wherein the copolymerization reaction is effected at a temperature between -100° and +30°C.
Claim 6
Dependent Claim 12 words
Process according to claim 1 wherein the isobutylene is copolymerized with isoprene.
Claim 7
Dependent Claim 44 words
Process according to claim 5 wherein the copolymerization reaction is effected by feeding to the zone of reaction a mixture of isobutylene and isoprene in quantities variable from 90% to 99.5% of isobutylene by weight and from 10 to 0.5% of isoprene by weight.

References Cited (Backward Citations)

US2581154A Cited
US2931791A Cited
US3231547A Cited
US3493549A Cited
US3631013A Cited
US3850896A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-06-22 1979-12-22 1980-06-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-06-22 1983-12-22 1984-06-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-06-22 1987-12-22 1988-06-22 $7700.00 Window Closed / Lapsed

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