Patent US4774356A successfully refreshed from Google Patents.
US4774356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyalkylene oxide having unsaturated end groups
Assignee: Kanegafuchi Chemical Industry Co Ltd
•
Filing: 1986-03-24
•
Granted: 1988-09-27
•
Expires: 2006-03-24
Abstract
Abstract Polypropylene oxide having unsaturated end groups is prepared by polymerizing alkylene oxide in the presence of a complex catalyst prepared by reacting an organoaluminum compound with a porphyrin compound and an active hydrogen-containing compound and converting at least one hydroxyl end groups into an unsaturated end group(s), the prepared polymer having a narrow distribution of molecular weight.
Inventors
- 👤 Shohei Inoue
- 👤 Takuzo Aida
- 👤 Michihide Honma
- 👤 Katsuhiko Isayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:50
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/331; C08G65/332; C08G65/3322; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12; C08G65/337
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A process for preparing polyalkylene oxide having at least one unsaturated end group and a distribution of molecular weight (Mw/Mn) of less than 1.3 which comprises the steps of (1) polymerizing alkylene oxide to obtain a polyalkylene oxide having at least one hydroxyl group in the presence of (a) a complex catalyst prepared by reacting an organoaluminum compound with a porphyrin compound and (b) an organic compound having at least two active hydrogen-containing groups selected from a hydroxyl group and a carboxylic group and (2) adding at least one unsaturated end group to the polymer chain by the reaction of the hydroxyl group with a molecule having a reactive halogen in addition to an unsaturated group.
Claim 2
Dependent Claim
116 words
A process for preparing polyalkylene oxide having at least one unsaturated end group and a distribution of molecular weight (Mw/Mn) of less than 1.3 which comprises the steps of (1) polymerizing alkylene oxide to obtain a polyalkylene oxide having at least one hydroxyl group in the presence of (a) a complex catalyst prepared by reacting an organoaluminum compound with a porphyrin compound and (b) an organic compound having at least two active hydrogen-containing groups selected from a hydroxyl group and a carboxylic group and (2) adding at least one unsaturated end group to the polymer chain by the reaction of the hydroxyl group with a molecule having a reactive halogen in addition to an unsaturated group.
Claim 3
Dependent Claim
12 words
The process according to claim 1, wherein the porphyrin compound is tetraphenylporphyrin.
Claim 4
Dependent Claim
12 words
The process according to claim 1, wherein alkylene oxide is propylene oxide.
Claim 5
Dependent Claim
69 words
A process for preparing polyalkylene oxide having at least one unsaturated end group and a distribution of molecular weight (Mw/Mn) of less than 1.3 which comprises the step of polymerizing alkylene oxide in the presence of (a) a complex catalyst prepared by reacting an organoaluminum compound with a porphyrin compound and (b) an organic compound having an unsaturated end group selected from a hydroxyl group and a carboxylic group.
Claim 6
Dependent Claim
69 words
A process for preparing polyalkylene oxide having at least one unsaturated end group and a distribution of molecular weight (Mw/Mn) of less than 1.3 which comprises the step of polymerizing alkylene oxide in the presence of (a) a complex catalyst prepared by reacting an organoaluminum compound with a porphyrin compound and (b) an organic compound having an unsaturated end group selected from a hydroxyl group and a carboxylic group.
Claim 7
Dependent Claim
12 words
The process according to claim 4, wherein the porphyrin compound is tetraphenylporphyrin.
Claim 8
Dependent Claim
12 words
The process according to claim 4, wherein alkylene oxide is propylene oxide.
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) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |