US4978730A
Expired / Lapsed
US
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Process for producing styrene-based polymers and catalyst for use therein
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1988-11-21
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Granted: 1990-12-18
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Expires: 2008-11-21
Abstract
Abstract A process for producing styrene-based polymers having mainly syndiotactic configuration in the presence of a catalyst comprising (A) a titanium compound and (B) a contact product of a methyl group-containing organoaluminum compound and water, wherein the contact product (B) has a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-methyl group (Al--CH 3 ) bond as determined by the proton nuclear magnetic resonance absorption method. According to this process, styrene-based polymers having mainly syndiotactic configuration can be efficiently and economically produced.
Inventors
- 👤 Hiroshi Maezawa
- 👤 Norio Tomotsu
- 👤 Masahiko Kuramoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:18
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/6592
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A process for producing styrene-based polymers having mainly syndiotactic configuration comprising polymerizing a styrene monomer in contact with a catalyst comprising (A) a titanium compound and (B) a contact product of a methyl group-containing organoaluminum compound and water, wherein the contact product (B) has a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-methyl group (Al--CH 3 ) bond as determined by the proton nuclear magnetic resonance absorption method.
Claim 2
Dependent Claim
79 words
A process for producing styrene-based polymers having mainly syndiotactic configuration comprising polymerizing a styrene monomer in contact with a catalyst comprising (A) a titanium compound and (B) a contact product of a methyl group-containing organoaluminum compound and water, wherein the contact product (B) has a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-methyl group (Al--CH 3 ) bond as determined by the proton nuclear magnetic resonance absorption method.
Claim 3
Dependent Claim
62 words
The process as claimed in claim 1 wherein the high magnetic component in the methyl proton signal region due to the aluminum-methyl group (Al--CH 3 ) bond as determined by the proton nuclear magnetic resonance absorption method is in the range of -0.1 to -0.5 ppm with the methyl proton (2.35 ppm) of toluene under toluene solvent measuring conditions as the standard.
Claim 4
Dependent Claim
30 words
The process as claimed in claim 1 wherein the contact product (B) has a molecular weight of 400 to 3,000 as determined by the freezing point depression method using benzene.
Claim 5
Dependent Claim
23 words
The process as claimed in claim 1 wherein the contact product (B) is further subjected to heat treatment at 30° to 200° C.
Claim 6
Dependent Claim
42 words
The process as claimed in claim 1 wherein the contact product (B) is a contact product of trimethylaluminum and tribranched alkylaluminum represented by the general formula: AlR.sub.3 (wherein R is a branched alkyl group having 3 to 10 carbon atoms) with water.
Claim 7
Dependent Claim
151 words
The process as claimed in claim 1 wherein the titanium compound (A) is at least one compound selected from the group consisting of titanium compounds and titanium chelate compounds represented by the formula: ##STR5## wherein R 1 , R 2 , R 3 and R 4 are independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkylaryl group having 6 to 20 carbon atoms, an arylalkyl group having 6 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, an acyloxy group having 1 to 20 carbon atoms, a cyclopentadienyl group, a pentamethylcyclopentadienyl group, an indenyl group or a halogen atom; a, b and c are independently an integer of 0 to 4, and d and e are independently an integer of 0 to 3.
Claim 8
Dependent Claim
32 words
The process as claimed in claim 1 wherein the catalyst comprises (A) a titanium compound, (B) a contact product of a methyl group-containing organoaluminum compound and water, and (C) an organoaluminum compound.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |