US4035444A
Expired / Lapsed
US
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Two-step polymerization process and product thereof
Assignee: Covestro International SA
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Filing: 1975-10-30
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Granted: 1977-07-12
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Expires: 1995-10-30
Abstract
Abstract A two-step process comprises (A) polymerizing ethylene in the presence of a catalyst comprising (1) at least one organoaluminum compound, (2) at least one titanium tetrahalide and (3) optionally, at least one Lewis base, and (B) thereafter polymerizing isoprene in the presence of the step (A) reaction mixture. The reaction product contains polymerized therein about 0.05 to about 2.2 weight percent ethylene. The reaction product has satisfactory green strength and monomer conversion efficiency together with excellent processability.
Inventors
- 👤 Hsun-kuang Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:28
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
173 words
A product of a process comprising (A) polymerizing ethylene monomer in the presence of a catalyst comprising (1) at least one organoaluminum compound and (2) at least one titanium tetrahalide and (B) thereafter polymerizing isoprene monomer in the presence of the step (A) reaction mixture, there being no substantial amount of unreacted ethylene present in the reaction mixture when isoprene is added thereto, said organoaluminum compound having the formula ##STR2## wherein R 1 is an alkyl group containing from 1 to 12 carbon atoms, a cycloalkyl group containing from 4 to 12 carbon atoms, or an aryl, alkaryl or aralkyl group containing from 6 to 14 carbon atoms, R 2 and R 3 are hydrogen, halogen or the same as R 1 , the molar ratio of said organoaluminum compound to said titanium tetrahalide is from about 0.6/1 to about 2/1, from about 0.1 millimole to about 50 millimoles of said catalyst is used per mole of total monomer, and said product contains polymerized therein about 0.05 to about 2.2 weight percent ethylene.
Claim 2
Dependent Claim
173 words
A product of a process comprising (A) polymerizing ethylene monomer in the presence of a catalyst comprising (1) at least one organoaluminum compound and (2) at least one titanium tetrahalide and (B) thereafter polymerizing isoprene monomer in the presence of the step (A) reaction mixture, there being no substantial amount of unreacted ethylene present in the reaction mixture when isoprene is added thereto, said organoaluminum compound having the formula ##STR2## wherein R 1 is an alkyl group containing from 1 to 12 carbon atoms, a cycloalkyl group containing from 4 to 12 carbon atoms, or an aryl, alkaryl or aralkyl group containing from 6 to 14 carbon atoms, R 2 and R 3 are hydrogen, halogen or the same as R 1 , the molar ratio of said organoaluminum compound to said titanium tetrahalide is from about 0.6/1 to about 2/1, from about 0.1 millimole to about 50 millimoles of said catalyst is used per mole of total monomer, and said product contains polymerized therein about 0.05 to about 2.2 weight percent ethylene.
Claim 3
Dependent Claim
27 words
A product of a process of claim 1 wherein said organoaluminum compound is a trialkylaluminum compound wherein each alkyl group contains from 2 to 8 carbon atoms.
Claim 4
Dependent Claim
18 words
A product of a process of claim 2 wherein said titanium tetrahalide is titanium tetrachloride or titanium tetrabromide.
Claim 5
Dependent Claim
21 words
A product of a process of claim 3 wherein said titanium tetrahalide is titanium tetrachloride, and said trialkylaluminum compound is triisobutylaluminum.
Claim 6
Dependent Claim
18 words
A product of a process of claim 1 wherein the polymerization is carried out in an inert solvent.
Claim 7
Dependent Claim
22 words
A product of a process of claim 1 wherein said catalyst contains an ether or an amine as a third catalyst component.
Claim 8
Dependent Claim
173 words
A process comprising (A) polymerizing ethylene monomer in the presence of a catalyst comprising (1) at least one organoaluminum compound and (2) at least one titanium tetrahalide and (B) thereafter polymerizing isoprene monomer in the presence of the step (A) reaction mixture, there being no substantial amount of unreacted ethylene present in the reaction mixture when isoprene is added thereto, said organoaluminum compound having the formula ##STR3## wherein R 1 is an alkyl group containing from 1 to 12 carbon atoms, a cycloalkyl group containing from 4 to 12 carbon atoms, or an aryl, alkaryl or aralkyl group containing from 6 to 14 carbon atoms, R 2 and R 3 are hydrogen, halogen or the same as R 1 , the molar ratio of said organoaluminum compound to said titanium tetrahalide is from about 0.6/1 to about 2/1, from about 0.1 millimole to about 50 millimoles of said catalyst is used per mole of total monomer, and the product of said process contains polymerized therein about 0.05 to about 2.2 weight percent ethylene.
Claim 9
Dependent Claim
173 words
A process comprising (A) polymerizing ethylene monomer in the presence of a catalyst comprising (1) at least one organoaluminum compound and (2) at least one titanium tetrahalide and (B) thereafter polymerizing isoprene monomer in the presence of the step (A) reaction mixture, there being no substantial amount of unreacted ethylene present in the reaction mixture when isoprene is added thereto, said organoaluminum compound having the formula ##STR3## wherein R 1 is an alkyl group containing from 1 to 12 carbon atoms, a cycloalkyl group containing from 4 to 12 carbon atoms, or an aryl, alkaryl or aralkyl group containing from 6 to 14 carbon atoms, R 2 and R 3 are hydrogen, halogen or the same as R 1 , the molar ratio of said organoaluminum compound to said titanium tetrahalide is from about 0.6/1 to about 2/1, from about 0.1 millimole to about 50 millimoles of said catalyst is used per mole of total monomer, and the product of said process contains polymerized therein about 0.05 to about 2.2 weight percent ethylene.
Claim 10
Dependent Claim
24 words
A process of claim 7 wherein said organoaluminum compound is a trialkylaluminum compound wherein each alkyl group contains from 2 to 8 carbon atoms.
Claim 11
Dependent Claim
15 words
A process of claim 8 wherein said titanium tetrahalide is titanium tetrachloride or titanium tetrabromide.
Claim 12
Dependent Claim
18 words
A process of claim 9 wherein said titanium tetrahalide is titanium tetrachloride, and said trialkylaluminum compound is triisobutylaluminum.
Claim 13
Dependent Claim
15 words
A process of claim 7 wherein the polymerization is carried out in an inert solvent.
Claim 14
Dependent Claim
19 words
A process of claim 7 wherein said catalyst contains an ether or an amine as a third catalyst component.
References Cited (Backward Citations)
CA664208A
Cited
US3684785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |