US4634745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terpolymer production
Assignee: Sunoco Inc R&M
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Filing: 1986-03-14
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Granted: 1987-01-06
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Expires: 2006-03-14
Abstract
Abstract Terpolymers comprising propylene and small amounts of ethylene and butene-1 are made in a two-stage process wherein a relatively high melting random terpolymer is made in a first stage and a relatively low-melting random terpolymer incorporating a higher concentration of ethylene, is made in a second stage so that it is dispersed in the product of the first stage. The two process stages may be operated in a single batch reactor or two continuous reactors in series.
Inventors
- 👤 Raymond J. Ehrig
- 👤 John J. Godfrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:50
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; C08F210/00; C08F210/04; C08F210/06; C08F210/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
Method of making a modified polypropylene in hexane slurry, said polypropylene having improved low-temperature thermal properties comprising (a) maintaining in a first stage under polymerizing conditions, including a pressure of about 140 psig to about 160 psig, a hexane-catalyst slurry in equilibrium with a gas phase composition comprising about 93.9% propylene, about 4.65% to about 5.15% 1-butene, and about 1.14% to about 1.26% ethylene, to form a dispersion in said slurry of terpolymer particles, and (b) then imposing on said slurry of terpolymer particles, under polymerizing conditions in a second stage, a concentration of ethylene in the gas phase increased to about 2% to about 4%, thereby forming a substrate terpolymer including about 3% to about 4% ethylene and about 3% to about 5.6% 1-butene, and recovering a polymer product having a melting point of about 130° C. to about 140° C.
Claim 2
Dependent Claim
142 words
Method of making a modified polypropylene in hexane slurry, said polypropylene having improved low-temperature thermal properties comprising (a) maintaining in a first stage under polymerizing conditions, including a pressure of about 140 psig to about 160 psig, a hexane-catalyst slurry in equilibrium with a gas phase composition comprising about 93.9% propylene, about 4.65% to about 5.15% 1-butene, and about 1.14% to about 1.26% ethylene, to form a dispersion in said slurry of terpolymer particles, and (b) then imposing on said slurry of terpolymer particles, under polymerizing conditions in a second stage, a concentration of ethylene in the gas phase increased to about 2% to about 4%, thereby forming a substrate terpolymer including about 3% to about 4% ethylene and about 3% to about 5.6% 1-butene, and recovering a polymer product having a melting point of about 130° C. to about 140° C.
Claim 3
Dependent Claim
34 words
Method of claim 1 wherein the concentrations of monomers in step (a) are maintained in the slurry by maintaining the reaction vessel at a pressure of from about 140 psig to about 160 psig.
Claim 4
Dependent Claim
22 words
Method of claim 1 wherein the second stage of the process is conducted in a reaction vessel different from the first stage.
Claim 5
Dependent Claim
13 words
Method of claim 1 wherein no 1-butene is fed to the second stage.
Claim 6
Dependent Claim
24 words
Method of claim 1 including the step of recovering a polymer product having a melting point of about 130° C. to about 140° C.
Claim 7
Dependent Claim
23 words
Method of claim 1 wherein the gas cap concentration of ethylene in the second step is maintained at about 3.23% to about 3.57%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |