Patent US4729976A successfully refreshed from Google Patents.
US4729976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer of dicyclopentadiene and a process for preparation
Assignee: Shell USA Inc
•
Filing: 1986-10-27
•
Granted: 1988-03-08
•
Expires: 2006-10-27
Abstract
Abstract The invention is a process for preparing a polymer which comprises contacting dicyclopentadiene with a catalyst comprising a phenolic substituted tungsten halide and a trialkyltin hydride or triphenyltin hydride and recovering said polymer. The invention is also a polymer of dicyclopentadiene as prepared in the process of the invention and a catalyst used in the process of the invention to prepare said polymer.
Inventors
- 👤 Willem Sjardijn
- 👤 Arris H. Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:04
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A catalyst composition for the preparation of a polymer of dicyclopentadiene which comprises (a) a tungsten compound having the formula ##STR7## wherein R 2 is a bulky alkyl group having at least 3 carbon atoms and R 3 is selected from the group consisting of an hydrogen atom and a bulky alkyl group having at least 3 carbon atoms, R 1 is selected from the group consisting of an hydrogen atom and an alkyl group of 1 to 10 carbon atoms, (m+n) is equal to 6 and n is 1 or 2, and (b) a tin compound having the formula ##STR8## wherein R 4 is selected from the group consisting of a phenyl group, and an alkyl group having 1 to 10 carbon atoms.
Claim 2
Dependent Claim
124 words
A catalyst composition for the preparation of a polymer of dicyclopentadiene which comprises (a) a tungsten compound having the formula ##STR7## wherein R 2 is a bulky alkyl group having at least 3 carbon atoms and R 3 is selected from the group consisting of an hydrogen atom and a bulky alkyl group having at least 3 carbon atoms, R 1 is selected from the group consisting of an hydrogen atom and an alkyl group of 1 to 10 carbon atoms, (m+n) is equal to 6 and n is 1 or 2, and (b) a tin compound having the formula ##STR8## wherein R 4 is selected from the group consisting of a phenyl group, and an alkyl group having 1 to 10 carbon atoms.
Claim 3
Dependent Claim
19 words
The catalyst of claim 1 wherein the tungsten compound has the formula ##STR9## wherein R is a isopropyl group.
Claim 4
Dependent Claim
20 words
The catalyst of claim 1 wherein the tungsten compound has the formula ##STR10## wherein R is a tertiary butyl group.
Claim 5
Dependent Claim
13 words
The catalyst of claim 1 wherein the tungsten compound is bis(2,6-isopropylphenoxy) tungsten tetrachloride.
Claim 6
Dependent Claim
13 words
The catalyst of claim 1 wherein the tungsten compound is 2,6-di-tert-butyl-4-methylphenoxy tungsten pentachloride.
Claim 7
Dependent Claim
24 words
The catalyst of claim 1 wherein R 4 is selected from the group consisting of an alkyl group having 1 to 6 carbon atoms.
Claim 8
Dependent Claim
13 words
The catalyst of claim 1 wherein the tin compound is tributyl tin hydride.
Claim 9
Dependent Claim
13 words
The catalyst of claim 1 wherein the tin compound is triphenyl tin hydride.
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) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |